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Articoli di riviste sul tema "Rhenium compounds"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 31 gennaio 2023

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1

Voronkova, Y. S., e N. I. Shtemenko. "Вплив кластерних сполук ренію з органічними лігандами на активність глюкозооксидази". Visnyk of Dnipropetrovsk University. Biology, medicine 2, n. 1 (21 marzo 2011): 18–23. http://dx.doi.org/10.15421/021103.

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Influence of cluster rhenium compounds with different ligands on the activity of glucoseoxidase was studied. Ability of the rhenium compounds to influence on the enzyme’s activity was ascertained. Itis depended on the compound structure and the time of incubation: activity of the glucoseoxidase changed by 4–24 %. The cluster compound with GABA ligand reduced the enzymatic activity, but compounds with hydrophobic ligands increased the activity of glucoseoxidase. Different mechanisms of the cluster rhenium compound–enzyme interactions are suspected.

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2

Suponko, J. V., e N. I. Shtemenko. "Вплив нанопрепаратів кластерних сполук ренію на активність ферментів печінки в моделі пухлинного росту". Visnyk of Dnipropetrovsk University. Biology, medicine 1, n. 2 (10 giugno 2010): 76–80. http://dx.doi.org/10.15421/021030.

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Enzymes’ level in rat’s hepatocytes under Guerin's carcinoma T8 development as well as after injection of rhenium compounds and cis-platin has been studied. It has been determined that the decrease of enzymatic activity to the level of the animals of control group was observed at the simultaneous injection of cis-platin and cluster rhenium compounds in nanoliposomal and water-soluble forms. That confirms possible hepatoprotective properties of the rhenium compounds. It has been shown that hepatoprotective properties of rhenium cluster compounds mostly don’t depend on the form of their injection and are detected regardless of anticancer properties. Rhenium-platinum system with β-alanine ligand in aqueous solution, has been found. Its injection is accompanied by the hepatoprotective effect.

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3

Golichenko, Alexander, e Alexander Shtemenko. "HYDROLYSIS OF RHENIUM(III) CLUSTER COMPOUNDS". Ukrainian Chemistry Journal 85, n. 3 (7 giugno 2019): 27–34. http://dx.doi.org/10.33609/0041-6045.85.3.2019.27-34.

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Study of hydrolysis of cis-tetrachlorodi-m-carboxylates of dirhenium (III) was carried out due to the electronic adsorption and IR spectroscopy and pHmeter. As a result, itwas shown that the hydrolysis is a multistage process which can be attributed to the reactions of the pseudo-first order. It is also shown that the electronic absorption spectroscopy (EAS) is a reliable method of investigation to study the hydrolysis of rhenium (III) complex compounds. This conclusion is based on the fact that in the systems with halide and carboxylic ligands, each of the five structural types can be clearly identified by the EAS in the region of both d–d* electron transition and charge transfer transition of L*Hal ®Re type. It is shown that with the increase in the length of the alkyl group and in its branching, the hydrolysis rate decreases, as a result of a change in the positive inductive effect of these groups and, consequently, an increase in the strengthening of quadruple Re–Re bond. In addition, with the help of the EAS, a transition of the chloride ligands to OHgroups can be observed. As a result of the study, a hydrolysis route, which initially leds to the gradual replacement of the chloride ligands of a complex compound with OH groups, and subsequently to the conversion of Re(III) compounds into the derivative of Re(IV) was proposed. The dependence of resistance to hydrolysis on the structure of the complex compound, the temperature and pH was determined. It allowed to predict the stability of the investigated compounds while their usage as biologically active substances and reagents in the synthesis of new compounds. The obtained results allow us to presence of anticancer, cytostabilizing and other biological activities is the coordination of Re(III) complex compounds with the components of biomolecules (proteins, DNA).

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4

Golichenko, Alexander, e Alexander Shtemenko. "HYDROLYSIS OF RHENIUM(III) CLUSTER COMPOUNDS". Ukrainian Chemistry Journal 85, n. 3 (7 giugno 2019): 27–34. http://dx.doi.org/10.33609/6045.85.3.2019.27-34.

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Abstract (sommario):

Study of hydrolysis of cis-tetrachlorodi-m-carboxylates of dirhenium (III) was carried out due to the electronic adsorption and IR spectroscopy and pHmeter. As a result, itwas shown that the hydrolysis is a multistage process which can be attributed to the reactions of the pseudo-first order. It is also shown that the electronic absorption spectroscopy (EAS) is a reliable method of investigation to study the hydrolysis of rhenium (III) complex compounds. This conclusion is based on the fact that in the systems with halide and carboxylic ligands, each of the five structural types can be clearly identified by the EAS in the region of both d–d* electron transition and charge transfer transition of L*Hal ®Re type. It is shown that with the increase in the length of the alkyl group and in its branching, the hydrolysis rate decreases, as a result of a change in the positive inductive effect of these groups and, consequently, an increase in the strengthening of quadruple Re–Re bond. In addition, with the help of the EAS, a transition of the chloride ligands to OHgroups can be observed. As a result of the study, a hydrolysis route, which initially leds to the gradual replacement of the chloride ligands of a complex compound with OH groups, and subsequently to the conversion of Re(III) compounds into the derivative of Re(IV) was proposed. The dependence of resistance to hydrolysis on the structure of the complex compound, the temperature and pH was determined. It allowed to predict the stability of the investigated compounds while their usage as biologically active substances and reagents in the synthesis of new compounds. The obtained results allow us to presence of anticancer, cytostabilizing and other biological activities is the coordination of Re(III) complex compounds with the components of biomolecules (proteins, DNA).

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5

Kononova, G. S., S. V. Antonuk e N. I. Shtemenko. "Вплив реній-платинової системи у вигляді наноліпосом на проліферативну активність ракових клітин". Visnyk of Dnipropetrovsk University. Biology, medicine 2, n. 1 (30 marzo 2011): 59–67. http://dx.doi.org/10.15421/021110.

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Decrease of proliferative activity of the cells of Guerin’s carcinoma T8 in the different conditions of administration of the Rhenium-Platinum anti-tumour system as nanolyposomes is shown. The Rhenium-Platinum anti-tumour system influenced on the morphological indices of tumour tissue. The cluster rhenium compounds reduced the indices of pathological mitoses 3.0–3.6 times in comparison with a control group. The amount of PCNA-positive cells under the Rhenium-Platinum system treatment went down by 82.5–84.5 %. The anti-tumour system led to the predominance of apoptotic cell death over the necrotic one. The most effective agent was the compound with cis-adamantan organic ligand cis-Re2(C10H15COO)2Cl4·2DMSO introducted on the 9th day.

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6

Brink, Alice, e John R. Helliwell. "Formation of a highly dense tetra-rhenium cluster in a protein crystal and its implications in medical imaging". IUCrJ 6, n. 4 (13 giugno 2019): 695–702. http://dx.doi.org/10.1107/s2052252519006651.

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The fact that a protein crystal can serve as a chemical reaction vessel is intrinsically fascinating. That it can produce an electron-dense tetranuclear rhenium cluster compound from a rhenium tricarbonyl tribromo starting compound adds to the fascination. Such a cluster has been synthesized previously in vitro, where it formed under basic conditions. Therefore, its synthesis in a protein crystal grown at pH 4.5 is even more unexpected. The X-ray crystal structures presented here are for the protein hen egg-white lysozyme incubated with a rhenium tricarbonyl tribromo compound for periods of one and two years. These reveal a completed, very well resolved, tetra-rhenium cluster after two years and an intermediate state, where the carbonyl ligands to the rhenium cluster are not yet clearly resolved, after one year. A dense tetranuclear rhenium cluster, and its technetium form, offer enhanced contrast in medical imaging. Stimulated by these crystallography results, the unusual formation of such a species directly in an in vivo situation has been considered. It offers a new option for medical imaging compounds, particularly when considering the application of the pre-formed tetranuclear cluster, suggesting that it may be suitable for medical diagnosis because of its stability, preference of formation and biological compatibility.

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7

Kuninobu, Yoichiro, Yuta Nishina, Atsushi Kawata, Makoto Shouho e Kazuhiko Takai. "Rhenium-catalyzed synthesis of indene derivatives via C-H bond activation". Pure and Applied Chemistry 80, n. 5 (1 gennaio 2008): 1149–54. http://dx.doi.org/10.1351/pac200880051149.

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Rhenium complex, [ReBr(CO)3(thf)]2-catalyzed reactions between aromatic imines and either acetylenes or α,β-unsaturated carbonyl compounds gave indene derivatives in good to excellent yields. These reactions proceed via C-H bond activation, insertion of acetylenes or α,β-unsaturated carbonyl compounds, intramolecular nucleophilic cyclization, and reductive elimination. Indene derivatives were also obtained from aromatic ketones and α,β-unsaturated carbonyl compounds in the presence of catalytic amounts of the rhenium complex and p-anisidine. Sequential ruthenium-catalyzed hydroamination of aromatic acetylenes with anilines, and rhenium-catalyzed reactions of the formed aromatic ketimines with α,β-unsaturated carbonyl compounds also provided indene derivatives.

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8

KUSAMA, Hiroyuki, e Koichi NARASAKA. "Rhenium Compounds in Organic Synthesis." Journal of Synthetic Organic Chemistry, Japan 54, n. 8 (1996): 644–53. http://dx.doi.org/10.5059/yukigoseikyokaishi.54.644.

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9

Adams, Richard D., e William C. Pearl. "Rhenium−Bismuth Carbonyl Cluster Compounds". Inorganic Chemistry 48, n. 19 (5 ottobre 2009): 9519–25. http://dx.doi.org/10.1021/ic901176x.

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10

Feller, J., H. Oppermann, M. Binnewies e E. Milke. "Zum Chemischen Transport von Rhenium und Rheniumoxiden/On the Chemical Transport of Rhenium and Rhenium Oxides". Zeitschrift für Naturforschung B 53, n. 2 (1 febbraio 1998): 184–90. http://dx.doi.org/10.1515/znb-1998-0210.

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Abstract Synthesis and single crystal growth by chemical transport reactions of rhenium and rhenium oxides is reported. Several transport agents like the mercury halides HgCl2, HgBr2, HgI2, tellurium tetrachloride and iodine have been employed the transport of the rhenium compounds. Mass spectrometric experiments gave informations about the composition of the gas phase. The transport reactions were traced by calculations based on the knowledge of the gas phase species and their thermodynamical data.

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11

Agahuseynova, Minira M., e Fidan D. Gudratova. "CLUSTER COMPLEXES OF RHENIUM WITH CARBONYL AND AMINE CONTAINING LIGANDS". IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENII KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA 64, n. 1 (8 dicembre 2020): 47–51. http://dx.doi.org/10.6060/ivkkt.20216401.6161.

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Methods for the synthesis of rhenium cluster complexes based on carbonyl and amine containing organic bifunctional ligands have been developed. The structure of the obtained cluster combinations were determined on the basis of IR spectroscopy data, methods of thermogravimetry and elemental analysis. Samples of ligands I and II were obtained by condensation of cyclopentane and cyclohexane carboxylic acids chloroanhydrides with ethylene, followed by the replacement of the chlorine atom by amine groups. To obtain cluster complexes of rhenium with the synthesized ligands, an ultradisperse solution of rhenium in distilled water was prepared in advance. To this end, the rhenium trichloride salt (ReCl3) was dissolved in water and the calculated amount of sodium borohydride in a nitrogen atmosphere was added in portions to the resulting solution with vigorous stirring. Rapidly arising black dispersed nanoparticles of metallic rhenium were not deposited. When organic ligands I and II are added, the corresponding cluster compounds III and IV are formed, which gradually over 30 minutes. precipitated from aqueous solution. The resulting black-brown precipitates were washed with distilled water and dried in a nitrogen atmosphere at a temperature of 35-40 °C. The melting points of the synthesized compounds are determined, which are components for cluster III-195 °С and cluster IV- 212 °С (with decomposition). In the IR spectra of cluster compounds, intense absorption bands were found, which characterize the presence of both a ketone carbonyl group (1718 sm–1, 1720 sm–1) and an amine fragment (2727 sm–1, 2720 sm–1 and 2613 sm–1, 2609 sm–1). The absorption bands of ketone groups in cluster compounds are shifted toward higher frequencies compared to the initial ligands. A similar picture is observed when comparing IR vibrations of C – N bonds in the initial ligands and the corresponding cluster compounds. The results of elemental analysis confirm the structure of cluster compounds and are in complete agreement with the notion that the reduction of rhenium salts with metal hydrides in an aqueous solution forms cluster compounds. Apparently, in this case, the most stable rhenium clusters with a tetrahedral structure are formed. Thermogravimetric analysis made it possible to establish the presence of a peak at a temperature of 318 °С with a mass number of 744.8 c.u. corresponding to the cluster combination of four rhenium atoms. At each stage of decomposition, the experimental mass loss agrees well with the calculated values.

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12

Agahuseynova, Minira M., e Fidan D. Gudratova. "CLUSTER COMPLEXES OF RHENIUM WITH CARBONYL AND AMINE CONTAINING LIGANDS". IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENII KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA 64, n. 1 (8 dicembre 2020): 47–51. http://dx.doi.org/10.6060/ivkkt.20216401.6161.

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Abstract (sommario):

Methods for the synthesis of rhenium cluster complexes based on carbonyl and amine containing organic bifunctional ligands have been developed. The structure of the obtained cluster combinations were determined on the basis of IR spectroscopy data, methods of thermogravimetry and elemental analysis. Samples of ligands I and II were obtained by condensation of cyclopentane and cyclohexane carboxylic acids chloroanhydrides with ethylene, followed by the replacement of the chlorine atom by amine groups. To obtain cluster complexes of rhenium with the synthesized ligands, an ultradisperse solution of rhenium in distilled water was prepared in advance. To this end, the rhenium trichloride salt (ReCl3) was dissolved in water and the calculated amount of sodium borohydride in a nitrogen atmosphere was added in portions to the resulting solution with vigorous stirring. Rapidly arising black dispersed nanoparticles of metallic rhenium were not deposited. When organic ligands I and II are added, the corresponding cluster compounds III and IV are formed, which gradually over 30 minutes. precipitated from aqueous solution. The resulting black-brown precipitates were washed with distilled water and dried in a nitrogen atmosphere at a temperature of 35-40 °C. The melting points of the synthesized compounds are determined, which are components for cluster III-195 °С and cluster IV- 212 °С (with decomposition). In the IR spectra of cluster compounds, intense absorption bands were found, which characterize the presence of both a ketone carbonyl group (1718 sm–1, 1720 sm–1) and an amine fragment (2727 sm–1, 2720 sm–1 and 2613 sm–1, 2609 sm–1). The absorption bands of ketone groups in cluster compounds are shifted toward higher frequencies compared to the initial ligands. A similar picture is observed when comparing IR vibrations of C – N bonds in the initial ligands and the corresponding cluster compounds. The results of elemental analysis confirm the structure of cluster compounds and are in complete agreement with the notion that the reduction of rhenium salts with metal hydrides in an aqueous solution forms cluster compounds. Apparently, in this case, the most stable rhenium clusters with a tetrahedral structure are formed. Thermogravimetric analysis made it possible to establish the presence of a peak at a temperature of 318 °С with a mass number of 744.8 c.u. corresponding to the cluster combination of four rhenium atoms. At each stage of decomposition, the experimental mass loss agrees well with the calculated values.

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13

Gayfulin, Yakov M., Konstantin A. Brylev, Maxim R. Ryzhikov, Denis G. Samsonenko, Noboru Kitamura e Yuri V. Mironov. "Luminescent twelve-nuclear rhenium clusters". Dalton Transactions 48, n. 33 (2019): 12522–30. http://dx.doi.org/10.1039/c9dt02352f.

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14

Ionov, A. M., M. R. Kobrin, R. N. Mozhchil, A. S. Sigov, Yu V. Syrov e V. V. Fomichev. "SYNTHESIS AND STUDY OF RHENIUM(IV) DISULPHIDE". Fine Chemical Technologies 12, n. 6 (28 dicembre 2017): 83–90. http://dx.doi.org/10.32362/2410-6593-2017-12-6-83-90.

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Synthesis and study of complex chalcogenides in the low oxidation state opens unexpected new opportunities of studying some fundamental problems of condensed matter physics. Dichalcogenides of transition metals, i.e., compounds with the general formula MX2, where M is molybdenum, tungsten, rhenium etc., and X is sulphur, selenium or tellurium, are especially interesting. These dichalcogenides find applications in optoelectronic devices, radiophotonics, in laser physics, communication technology, etc. This study contains a survey of literature concerning the synthesis of sulphides of transition elements from different groups of the Periodic table in low oxidation states. A method of direct hightemperature synthesis of ReS2 from source components has been proposed and implemented. The synthesized compound was identified by the X-ray fluorescence, method of photoelectron spectroscopy and IR absorption spectroscopy. We show that rhenium(IV) disulphide crystallizes in CdI2 structural type. X-ray photoelectron spectroscopy shows that rhenium in the oxidation state of four is present. IR spectrum shows that rhenium(IV) disulphide structure in contrast to molybdenum(IV) disulphide is characterized by a greater deformation of the layers forming the crystal structure.

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15

Leszczyńska-Sejda, Katarzyna, Grzegorz Benke, Joanna Malarz, Mateusz Ciszewski, Dorota Kopyto, Jędrzej Piątek, Michał Drzazga, Patrycja Kowalik, Krzysztof Zemlak e Bartłomiej Kula. "Rhenium(VII) Compounds as Inorganic Precursors for the Synthesis of Organic Reaction Catalysts". Molecules 24, n. 8 (12 aprile 2019): 1451. http://dx.doi.org/10.3390/molecules24081451.

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Rhenium is an element that exhibits a broad range of oxidation states. Synthesis paths of selected rhenium compounds in its seventh oxidation state, which are common precursors for organic reaction catalysts, were presented in this paper. Production technologies for copper perrhenate, aluminum perrhenate as well as the ammonia complex of cobalt perrhenate, are thoroughly described. An ion exchange method, based on Al or Cu metal ion sorption and subsequent elution by aqueous perrhenic acid solutions, was used to obtain perrhenates. The produced solutions were neutralized to afford the targeted aluminum perrhenate and copper perrhenate products in high purity. The developed technologies allow one to manage the wastes from the production of these perrhenates as most streams were recycled. Hexaamminecobalt(III) perrhenate was produced by a newly developed method enabling us to produce a high purity compound in a reaction of spent hexaamminecobalt(III) chloride solution with a perrhenic acid. All prepared compounds are the basis for precursor preparation in organic catalysis.

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16

Collery, Philippe, Didier Desmaele e Veena Vijaykumar. "Design of Rhenium Compounds in Targeted Anticancer Therapeutics". Current Pharmaceutical Design 25, n. 31 (14 novembre 2019): 3306–22. http://dx.doi.org/10.2174/1381612825666190902161400.

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Background: Many rhenium (Re) complexes with potential anticancer properties have been synthesized in the recent years with the aim to overcome the clinical limitations of platinum agents. Re(I) tricarbonyl complexes are the most common but Re compounds with higher oxidation states have also been investigated, as well as hetero-metallic complexes and Re-loaded self-assembling devices. Many of these compounds display promising cytotoxic and phototoxic properties against malignant cells but all Re compounds are still at the stage of preclinical studies. Methods: The present review focused on the rhenium based cancer drugs that were in preclinical and clinical trials were examined critically. The detailed targeted interactions and experimental evidences of Re compounds reported by the patentable and non-patentable research findings used to write this review. Results: In the present review, we described the most recent and promising rhenium compounds focusing on their potential mechanism of action including, phototoxicity, DNA binding, mitochondrial effects, oxidative stress regulation or enzyme inhibition. Many ligands have been described that modulating the lipophilicity, the luminescent properties, the cellular uptake, the biodistribution, and the cytotoxicity, the pharmacological and toxicological profile. Conclusion: Re-based anticancer drugs can also be used in targeted therapies by coupling to a variety of biologically relevant targeting molecules. On the other hand, combination with conventional cytotoxic molecules, such as doxorubicin, allowed to take into profit the targeting properties of Re for example toward mitochondria. Through the example of the diseleno-Re complex, we showed that the main target could be the oxidative status, with a down-stream regulation of signaling pathways, and further on selective cell death of cancer cells versus normal cells.

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17

Louie, Brenda M., Steven J. Rettig, Alan Storr e James Trotter. "Rhenium and manganese carbonyl compounds incorporating tridentate chelating pyrazolyl gallate ligands". Canadian Journal of Chemistry 63, n. 8 (1 agosto 1985): 2261–72. http://dx.doi.org/10.1139/v85-373.

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The coordinating properties of a variety of unsymmetrical uninegative tridentate chelating "pyrazolylgallate" ligands have been studied using the tricarbonyl moieties "M(CO)3", where M = Mn or Re, as acceptor species. A series of monomeric, pseudo octahedral complexes has been characterized and a fac mode of coordination established for the tridentate gallate ligands from 1H nmr, ir measurements, and X-ray structure determinations. Nitrosylation of a selection of the rhenium tricarbonyl compounds has yielded a number of cationic rhenium mononitrosyl dicarbonyl species. The reactivity of these cations towards reducing agents has been investigated.

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18

Salakhova, Elza, D. B. Tagiyev, P. E. Kalantarova e A. M. Asgarova. "The Electrodeposition rhenium-tellurium alloys from chlorides asides electrolytes." JOURNAL OF ADVANCES IN CHEMISTRY 15, n. 2 (4 luglio 2018): 6199–206. http://dx.doi.org/10.24297/jac.v15i2.7457.

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There has been investigated the joint electrodeposition of rhenium with tellur from chlorides electrolyte, by measuring the cycling volt-ampere curves there has been determined the field of potentials, at the presence of which the joint electrodeposition of rhenium with sulphur takes place. It has been shown, that the joint deposition of rhenium with tellur goes with a certain depolarization, besides, the depolarization is caused by the energy emanating along formation of ReTe2 compounds. There was studied the influence of current density, temperature and acidity on the composition and quality of cathode sediments. It was established, that with the rise of current density and the temperature of electrolyte the concentration of rhenium in the alloy increases.

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19

Kianfar, Elham, Uwe Monkowius, Engelbert Portenkirchner e Günther Knör. "Synthesis and Characterization of Novel Re(BIAN)(CO)3Cl Derivatives Including the First Example of a Water-soluble Tricarbonyl Rhenium(I) Complex with Bis(imino)acenaphthene Ligands". Zeitschrift für Naturforschung B 69, n. 6 (1 giugno 2014): 691–98. http://dx.doi.org/10.5560/znb.2014-4016.

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A series of rhenium(I) carbonyl chloride complexes carrying bis(imino)acenaphthene (BIAN) molecules as p-acceptor ligands was prepared and characterized by various spectroscopic techniques. Among the novel compounds described, the remarkable example of a deeply colored water-soluble rhenium carbonyl derivative is presented. The crystal structures of this family of BIAN compounds are also reported, which confirm the position of the chloro ligand at the tricarbonyl rhenium(I) center. In the case of BIAN ligands carrying bulky substituents in the ortho-position of the arylimino subunits, evidence has been found for an exchange of the halide ligand in solution, which is considered to be of major relevance for catalytic applications. Implications of our results for the fields of photocatalytic CO2 reduction and the controlled release of the gasotransmitter CO in aqueous solution are briefly discussed.

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Herrmann, Wolfgang A., Dieter W. Marz e Eberhardt Herdtweck. "Mehrfachbindungen zwischen Hauptgruppenelementen und Übergangsmetallen, LXXXIX / Multiple Bonds between Main Group Elements and Transition Metals, LXXXIX". Zeitschrift für Naturforschung B 46, n. 6 (1 giugno 1991): 747–52. http://dx.doi.org/10.1515/znb-1991-0608.

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Reaction of (N-trimethylsilyl)-α-aminopicolin with the rhenium(V) oxohalogenide (η5-C5Me5)ReOCl2 (Me = CH3) exemplifies a simple, clean synthesis of imido-metallosiloxanes, compounds of the structure R3SiO—M=N—R′. The compound (η5-C5Me5)ReCl[OSi(CH3)3](NCH2-2-C5H4N) thus formed under HCl elimination has a square-pyramidal molecular structure (single crystal X-ray diffraction).

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Mösch-Zanetti, Nadia C., Anna Sachse, Roland Pfoh, Denis Vidović e Jörg Magull. "Rhenium oxo compounds containing η2-pyrazolate ligands". Dalton Transactions, n. 12 (2005): 2124. http://dx.doi.org/10.1039/b501025j.

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22

KUSAMA, H., e K. NARASAKA. "ChemInform Abstract: Rhenium Compounds in Organic Synthesis". ChemInform 28, n. 13 (4 agosto 2010): no. http://dx.doi.org/10.1002/chin.199713226.

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23

Fröba, M., K. Lochte e W. Metz. "XANES studies on rhenium L absorption edges of Re2O7 graphite intercalation compounds and of other rhenium-oxygen compounds". Journal of Physics and Chemistry of Solids 57, n. 5 (maggio 1996): 635–41. http://dx.doi.org/10.1016/0022-3697(95)00242-1.

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24

Niemann, Sabine, e Wolfgang Jeitschko. "The Crystal Structures of Re2Al, Re4Al11, and ReAl6". Zeitschrift für Naturforschung B 48, n. 12 (1 dicembre 1993): 1767–73. http://dx.doi.org/10.1515/znb-1993-1212.

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Well-crystallized samples of the rhenium aluminides Re4Al11 and ReAl6 were obtained by reaction of rhenium with an excess of aluminum. Re4Al11 was found to be isotypic with Mn4Al11. The MnAl6 type structure of ReAl6 was confirmed. The crystal structures of both compounds were refined from single-crystal X-ray data. Re4Al11:P1̄, Z = 1, a = 516.0(1) pm, b = 896.3(2) pm, c = 516.9(1) pm, a = 90.44(1)°, β = 99.76(1)°, γ = 105.17(1)°, V = 0.2271 nm3, R = 0.036 for 2315 structure factors and 74 variable parameters. ReAl6: Cmcm, Z = 4, a = 761.0(1) pm, b = 660.5(1) pm, c = 903.4(1) pm, V = 0.4541 nm3, R = 0.013 for 711F values and 23 variables. In both structures the rhenium atoms have ten aluminum neighbors at distances from 245 to 277 pm. The Al-Al distances cover the whole range from 251 to 362 pm rather continuously. The previously reported compound Re2Al with the tetragonal MoSi2-type structure has the lattice constants a = 298.1(1) pm, c = 958.4(4) pm, V = 0.08519 nm3. ReAl6 shows Pauli-paramagnetism.

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25

Frin, Karina P. Morelli, e Rafael M. de Almeida. "Mono- and di-nuclear Re(i) complexes and the role of protonable nitrogen atoms in quenching emission by hydroquinone". Photochemical & Photobiological Sciences 16, n. 8 (2017): 1230–37. http://dx.doi.org/10.1039/c7pp00092h.

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26

Yadav, Ravi, Thomas Simler, Michael T. Gamer, Ralf Köppe e Peter W. Roesky. "Rhenium is different: CO tetramerization induced by a divalent lanthanide complex in rhenium carbonyls". Chemical Communications 55, n. 41 (2019): 5765–68. http://dx.doi.org/10.1039/c9cc02350j.

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27

Chen, Ji, e Jimmy Wu. "Catalytic vinylogous cross-coupling reactions of rhenium vinylcarbenoids". Chemical Science 9, n. 9 (2018): 2489–92. http://dx.doi.org/10.1039/c7sc05477g.

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28

Aleksanyan, Diana V., Svetlana G. Churusova, Ekaterina Yu Rybalkina e Vladimir A. Kozlov. "Rhenium(I) Complexes with Pincer Ligands as a New Class of Potential Antitumor Agents". Proceedings 22, n. 1 (8 agosto 2019): 43. http://dx.doi.org/10.3390/proceedings2019022043.

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Abstract (sommario):

Transition metal complexes attract continuous research interest as potential antitumor agents. The most popular compounds are ruthenium, gold, titanium, osmium, iridium, zinc, and palladium complexes, which have already displayed cytotoxic features that are not typical for classical platinum-containing chemotherapeutic agents. Substantially lower attention is drawn to organometallic compounds of rhenium. However, the known examples of cytotoxic organometallic rhenium derivatives with bidentate heterocyclic, organophosphorus, labile alkoxide, and hydroxide ligands render further studies in this field very promising. As for their analogs with multidentate ligands, a literature survey has revealed only a few examples of cytotoxic rhenium complexes, whereas the antitumor activity of cyclometallated derivatives has not been studied at all. At the same time, it is known that the use of pincer-type ligands having specific tridentate monoanionic frameworks, which offer multiple options for directed structural modifications, allows one to finely tune the thermodynamic and kinetic stability of the resulting metal complexes. Therefore, we synthesized and studied the cytotoxic properties of a series of rhenium(I) complexes with tridentate pincer-type ligands based on functionalized carboxamides bearing ancillary donor groups both in the acid and amine components. It was shown that the target complexes can be obtained not only by the conventional solution-based method, but also under solvent-free conditions according to the solid-phase methodology recently developed in our group. The results obtained were used to define the main structure–activity relationships for a principally new class of potential antitumor agents and to choose the most promising compounds for further studies in order to create new pharmaceuticals.

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29

Ehrenberg, H., T. Hartmann, G. Wltschek, H. Fuess, W. Morgenroth e H. G. Krane. "The crystal structure of Tm5Re2O12". Acta Crystallographica Section B Structural Science 55, n. 6 (1 dicembre 1999): 849–52. http://dx.doi.org/10.1107/s0108768199005194.

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The crystal structure of Tm5Re2O12, pentathulium dirhenium dodecaoxide, was determined by synchrotron diffraction on a reticular merohedral twin, revealing space group C2/m with a = 12.3717 (7), b = 5.6744 (3), c = 7.4805 (4) Å, β = 107.816 (2)° and Z = 2. Distorted ReO6 octahedra form chains with alternating rhenium–rhenium distances of 2.455 (1) and 3.219 (1) Å. Early reports on Ln2ReO5 compounds are critically reviewed in the light of our results for Tm5Re2O12.

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30

Kjellberg, Marianne, Alexia Ohleier, Pierre Thuéry, Emmanuel Nicolas, Lucile Anthore-Dalion e Thibault Cantat. "Photocatalytic deoxygenation of N–O bonds with rhenium complexes: from the reduction of nitrous oxide to pyridine N-oxides". Chemical Science 12, n. 30 (2021): 10266–72. http://dx.doi.org/10.1039/d1sc01974k.

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31

Shtemenko, Alexander V., Alexander A. Golichenko e Konstantin V. Domasevitch. "Synthesis of Novel Tetracarboxylato Dirhenium(III) Compounds and Crystal Structure of [Re2(1-Adamantylcarboxylate)4Cl2] · 4 CHCl3". Zeitschrift für Naturforschung B 56, n. 4-5 (1 maggio 2001): 381–85. http://dx.doi.org/10.1515/znb-2001-4-510.

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Abstract The coordination compounds o f the general formula Re2 (L)4X2 (X = Cl, Br; L = 1 -adamantyl-carboxylate and 1 -adamantylacetate) have been prepared and characterized by means of UV-VIS spectroscopy (20000 cm-1 , δ → δ*). The crystal and molecular structure of Re2(AdCOO)4Cl2 · 4 CHCl3 solvate was determined by X-ray diffraction. The units Re2(AdCOO)4Cl2 adopt a centrosymmetric dinuclear array with each metal atom coordinated in a distorted octahedron comprising one rhenium and one chlorine atoms (Re-Cl 2.505(2) Å) and four carboxylate oxygen atoms in the equatorial plane. The rhenium-rhenium separation of 2.2300(5) Å corresponds to quadruple bond between the metal atoms. All R e-0 bonds have an almost uniform length (2.017(4) -2.032(4) Å) and do not differ essentially from the parameters reported for related compounds. The closest environment of the Re2(AdCOO)4Cl2 molecules in the crystal comprises weak Cl---HC hydrogen bonds with the chloroform molecules and significantly shortened van der Waals contacts Cl---Cl, 3.46 Å.

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32

Li, Ming, Arkady Ellern e James H. Espenson. "Phosphine-Promoted Conversion of Oxo(dithiolato)rhenium(V) into Thio(thiolatoalkyl)rhenium(V) Compounds". Angewandte Chemie International Edition 43, n. 43 (5 novembre 2004): 5837–39. http://dx.doi.org/10.1002/anie.200461060.

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33

Li, Ming, Arkady Ellern e James H. Espenson. "Phosphine-Promoted Conversion of Oxo(dithiolato)rhenium(V) into Thio(thiolatoalkyl)rhenium(V) Compounds". Angewandte Chemie 116, n. 43 (5 novembre 2004): 5961–63. http://dx.doi.org/10.1002/ange.200461060.

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34

Ryashentseva, Margarita A. "Rhenium-containing catalysts in reactions of organic compounds". Russian Chemical Reviews 67, n. 2 (28 febbraio 1998): 157–77. http://dx.doi.org/10.1070/rc1998v067n02abeh000390.

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35

Oehlke, Elisabeth, Shushu Kong, Pawel Arciszewski, Swantje Wiebalck e Ulrich Abram. "Aryl and NHC Compounds of Technetium and Rhenium". Journal of the American Chemical Society 134, n. 22 (21 maggio 2012): 9118–21. http://dx.doi.org/10.1021/ja3033718.

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36

Martínez-Lillo, José, Teresa F. Mastropietro, Rosamaria Lappano, Antonio Madeo, Marta E. Alberto, Nino Russo, Marcello Maggiolini e Giovanni De Munno. "Rhenium(iv) compounds inducing apoptosis in cancer cells". Chemical Communications 47, n. 18 (2011): 5283. http://dx.doi.org/10.1039/c1cc11038a.

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37

Gancheff, Jorge, Carlos Kremer, Eduardo Kremer e Oscar N. Ventura. "Density functional study of technetium and rhenium compounds". Journal of Molecular Structure: THEOCHEM 580, n. 1-3 (marzo 2002): 107–16. http://dx.doi.org/10.1016/s0166-1280(01)00601-7.

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38

Cai, S., D. M. Hoffman e D. A. Wierda. "Synthesis of dinuclear rhenium(VI) oxo-sulfido compounds". Inorganic Chemistry 30, n. 4 (febbraio 1991): 827–31. http://dx.doi.org/10.1021/ic00004a041.

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39

Wltschek, G., M. Fr�ba, H. Fuess e W. Metz. "XAS and XRD studies of rhenium-oxygen compounds". Fresenius' Journal of Analytical Chemistry 349, n. 1-3 (1994): 230–31. http://dx.doi.org/10.1007/bf00323289.

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40

Borisova, L. V., V. V. Minin e S. B. Savvin. "Rhenium(VI) compounds in the reactions with hydroxylamine". Russian Journal of Inorganic Chemistry 56, n. 2 (febbraio 2011): 247–51. http://dx.doi.org/10.1134/s0036023611020033.

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41

Abu-Abdoun, Idesan I., H. H. Al-Alawi e S. F. Sikander. "Polymerization of N-vinylcarbazole by rhenium carbonyl compounds". Designed Monomers and Polymers 1, n. 2 (gennaio 1998): 237–44. http://dx.doi.org/10.1163/156855598x00341.

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42

TUROWSKY, L., e K. SEPPELT. "ChemInform Abstract: Rhenium Compounds with the -OTeF5 Ligand." ChemInform 22, n. 21 (23 agosto 2010): no. http://dx.doi.org/10.1002/chin.199121037.

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43

Jeitschko, Wolfgang, Horst A. Mons, Ute Ch Rodewald e Manfred H. Möller. "The Crystal Structure of the Potential Ferroelectric Calcium Rhenate(VI, VII) Ca11Re4O24 and its Relation to the Structure of Sr11Os4O24". Zeitschrift für Naturforschung B 53, n. 1 (1 gennaio 1998): 31–36. http://dx.doi.org/10.1515/znb-1998-0108.

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Abstract (sommario):

The title compound was prepared in well-crystallized form by thermal decomposition of Ca5Re2O12. Its structure was determined from single-crystal X-ray diffractometer data: I41, a = 1107.0(1), c = 1609.3(1) pm, Z = 4, R = 0.056 for 4565 structure factors and 119 variable parameters. The calcium atoms occupy seven different sites with 8, 9, or 10 oxygen neighbors. The two different rhenium atoms are octahedrally coordinated by oxygen atoms with average Re-O distances of 193.1 and 187.7 pm for the six- and seven-valent rhenium atoms, respectively. The compound shows Curie-Weiss behavior with a magnetic moment of μexp = 1.15(±0.10) μB per Re(VI) atom. The structure is closely related to that of Sr11Os4O24 which, however, crystallizes in the space group I2/a. The difference between the two structures arises through the higher coordination numbers of the strontium atoms. It is suggested that at high temperature both compounds crystallize in the common higher symmetry space group I4/a. Since Ca11Re4O24 crystallizes in the pyroelectric class 4 this compound is expected to be ferroelectric.

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44

ALBERTO, ROGER. "APPLICATION OF TECHNETIUM AND RHENIUM IN NUCLEAR MEDICINE". COSMOS 08, n. 01 (giugno 2012): 83–101. http://dx.doi.org/10.1142/s0219607712300019.

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Abstract (sommario):

Technetium and Rhenium are the two lower elements in the manganese triad. Whereas rhenium is known as an important part of high resistance alloys, technetium is mostly known as a cumbersome product of nuclear fission. It is less known that its metastable isotope 99mTc is of utmost importance in nuclear medicine diagnosis. The technical application of elemental rhenium is currently complemented by investigations of its isotope 188Re , which could play a central role in the future for internal, targeted radiotherapy. This article will briefly describe the basic principles behind diagnostic methods with radionuclides for molecular imaging, review the 99mTc -based radiopharmaceuticals currently in clinical routine and focus on the chemical challenges and current developments towards improved, radiolabeled compounds for diagnosis and therapy in nuclear medicine.

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45

Aimene, Yassine, Romain Eychenne, Frédéric Rodriguez, Sonia Mallet-Ladeira, Nathalie Saffon-Merceron, Jean-Yves Winum, Alessio Nocentini, Claudiu T. Supuran, Eric Benoist e Achour Seridi. "Synthesis, Crystal Structure, Inhibitory Activity and Molecular Docking of Coumarins/Sulfonamides Containing Triazolyl Pyridine Moiety as Potent Selective Carbonic Anhydrase IX and XII Inhibitors". Crystals 11, n. 9 (6 settembre 2021): 1076. http://dx.doi.org/10.3390/cryst11091076.

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Abstract (sommario):

In this work, two classes of Carbonic Anhydrase (CA) inhibitors, sulfonamide and coumarin derivatives linked to pyta moiety (2a-b) and their corresponding rhenium complexes (3a-b), were designed. These compounds were synthesized and fully characterized by classical analytical methods and X-ray diffraction. All the synthesized compounds were evaluated for their inhibitory activity against the hCA isoforms I, II, IX and XII. They exhibited high inhibitory activities in the range of nanomolar for both hCA IX and hCA XII isoforms. The sulfonamide compound 2a showed the strongest inhibition against the tumour-associated hCA IX isoform with a Ki of 11.7 nM. The tumour-associated isoforms hCA IX and hCA XII were selectively inhibited by all the coumarin derivatives, with inhibition constants ranging from 12.7 nM (2b) to 44.5 nM (3b), while the hCA I and II isoforms were slightly inhibited (in the micromolar range), as expected. In terms of selectivity, compared to previously published rhenium complex-based CA inhibitors, complex 3b showed one of the highest selectivities against hCA IX and hCA XII compared to the off-target isoforms hCA I and hCA II, making it a potential anti-cancer drug candidate. Molecular docking calculations were performed to investigate the inhibition profiles of the investigated compounds at the tumour-associated hCA IX active site and to rationalize our results.

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46

Leszczyńska-Sejda, Katarzyna, Grzegorz Benke, Dorota Kopyto, Michał Drzazga e Mateusz Ciszewski. "Application of Ion Exchange for Preparation of Selected Metal Perrhenates—Precursors for Superalloy Production". Metals 9, n. 2 (8 febbraio 2019): 201. http://dx.doi.org/10.3390/met9020201.

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Abstract (sommario):

Methods for the preparation of selected metal perrhenates and their mixtures are presented in this paper. These materials are suitable for reduction, and therefore for production of alloy powders containing rhenium and other superalloy components, i.e., Cr, Ni and Co. Prepared compounds may be also used as substrates for electrowinning of binary and ternary rhenium alloys. All developed methods are based on an ion exchange technique. This technique allows management of waste solutions, limitation of valuable metals losses, and, importantly, production of high-purity components.

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47

Herrmann, Wolfgang A., Josef K. Felixberger, Josef G. Kuchler e Eberhardt Herdtweck. "Alkin-Komplexe des Rheniums in hohen Oxidationsstufen / Alkyne Complexes of Rhenium in High Oxidation States". Zeitschrift für Naturforschung B 45, n. 6 (1 giugno 1990): 876–86. http://dx.doi.org/10.1515/znb-1990-0620.

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Abstract (sommario):

The class of π-alkyne complexes of metals in medium and high oxidation states has been extended by the type CH3ReO2(RC≡CR′) (3a—i). Exchange of alkyne for oxo ligands under reducing conditions has been employed as a new general synthesis. Compounds 3 are thus obtained by reaction of methyltrioxorhenium(VII) (1) with the alkynes 2a—i in the presence of a ca. 1.1-fold molar amount of polymer-bound triphenylphosphane as reducing agent (desoxygenation). The structural characterization was carried out for the example of the tolan complex 3 e by virtue of a single-crystal X-ray diffraction study at —80 °C, according to which the description of compounds 3 as “rhenacyclopropenes” seems justified. Evidence from NMR investigations of 3 a and 3 c shows that no fast rotation of the respective alkyne ligand around the axis to the metal atom occurs on the NMR time scale up to at least 105 °C. A minimal rotation barrier of approximately 20 kcal/mol is thus to be estimated. Reaction of type 3 compounds (R = R′ = CH3, b; R = R′ = C2H5, c) with polymer-bound triphenylphosphane under more drastic conditions (boiling toluene) for two days effects further reduction, with the dinuclear, diamagnetic rhenium(IV) complexes 4b and 4c, resp., being formed. Sterically demanding alkynes (e.g., R = R′ = Si(CH3)3, C6H5) seem to prevent this type of reaction. According to an X-ray diffraction study, 4b has an equilateral Re2O-triangular core geometry, with the ligands O, CH3, and butyne(2) arranged in such a way that C2-symmetry results. The alkyne complexes reported here are the first ones of tetra- and pentavalent rhenium.

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48

Kuninobu, Yoichiro, Atsushi Kawata, Salprima S. Yudha, Hisatsugu Takata, Mitsumi Nishi e Kazuhiko Takai. "Rhenium- and manganese-catalyzed carbon–carbon bond formation using 1,3-dicarbonyl compounds and alkynes". Pure and Applied Chemistry 82, n. 7 (6 maggio 2010): 1491–501. http://dx.doi.org/10.1351/pac-con-09-09-21.

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Abstract (sommario):

A rhenium complex, [ReBr(CO)3(thf)]2, catalyzed insertion of terminal alkynes into a C–H bond of active methylene sites of 1,3-dicarbonyl compounds. When a catalytic amount of isocyanide or molecular sieves was added to the reaction mixture, the reaction course changed markedly, and insertion of alkynes into a C–C single bond between α- and β-positions of cyclic and acyclic β-keto esters occurred. The formed acyclic δ-keto esters could be converted to 2-pyranones, which were applied to the synthesis of multisubstituted aromatic compounds via the Diels–Alder reaction and successive elimination of carbon dioxide. In the case of the rhenium-catalyzed reactions between terminal alkynes and β-keto esters without substituent at the α-position, tetrasubstituted benzenes were produced regioselectively by two-to-one reaction of the components. The yields of tetrasubstituted benzenes were improved by using a manganese catalyst.

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49

Hacatrjan, Schanth, Lujie Liu, Jianxing Gan, Yoshinao Nakagawa, Ji Cao, Mizuho Yabushita, Masazumi Tamura e Keiichi Tomishige. "Titania-supported molybdenum oxide combined with Au nanoparticles as a hydrogen-driven deoxydehydration catalyst of diol compounds". Catalysis Science & Technology 12, n. 7 (2022): 2146–61. http://dx.doi.org/10.1039/d1cy02144c.

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50

Ayadi, Awatef, Aziz El Alamy, Olivier Alévêque, Magali Allain, Nabil Zouari, Mohammed Bouachrine e Abdelkrim El-Ghayoury. "Tetrathiafulvalene-based azine ligands for anion and metal cation coordination". Beilstein Journal of Organic Chemistry 11 (7 agosto 2015): 1379–91. http://dx.doi.org/10.3762/bjoc.11.149.

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Abstract (sommario):

The synthesis and full characterization of two tetrathiafulvalene-appended azine ligands, namely 2-([2,2’-bi(1,3-dithiolylidene)]-4-yl)-6-((2,4-dinitrophenyl)hydrazono)methyl)pyridine (L1) and 5-([2,2’-bi(1,3-dithiolylidene)]-4-yl)-2-((2,4-dinitrophenyl)hydrazono)methyl)pyridine (L2) are described. The crystal structure of ligand L1 indicates that the ligand is completely planar with the presence of a strong intramolecular N3–H3···O1 hydrogen bonding. Titration experiments with inorganic anions showed that both ligands are suitable candidates for the sensing of fluoride anions. Ligand L2 was reacted with a Re(I) cation to yield the corresponding rhenium tricarbonyl complex 3. In the crystal structure of the newly prepared electroactive rhenium complex the TTF is neutral and the rhenium cation is hexacoordinated. The electrochemical behavior of the three compounds indicates that they are promising for the construction of crystalline radical cation salts.

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