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Auteur : Grafiati
Publié le 10 mars 2023

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1

Bytschkov, Igor, et Sven Doye. « Group-IV Metal Complexes as Hydroamination Catalysts ». European Journal of Organic Chemistry 2003, no 6 (mars 2003) : 935–46. http://dx.doi.org/10.1002/ejoc.200390149.

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2

Han-Mou, Gau, Chen Chi-Tain, Jong Ting-Ting et Chien Mei-Yueh. « Group IV metal-chromium complexes bridged by a benzoate group ». Journal of Organometallic Chemistry 448, no 1-2 (avril 1993) : 99–106. http://dx.doi.org/10.1016/0022-328x(93)80074-l.

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3

Neelam Jalil, N. S. « Complexes of Benzothiazole with Some Group IV Metal Halides ». Synthesis and Reactivity in Inorganic and Metal-Organic Chemistry 20, no 9 (octobre 1990) : 1285–300. http://dx.doi.org/10.1080/00945719008048633.

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Jalil, N. S. Neelam, et Lara T. Hameed. « SCHIFF BASE COMPLEXES OF SOME GROUP IV METAL HALIDES ». Phosphorus, Sulfur, and Silicon and the Related Elements 112, no 1-4 (1 mai 1996) : 171–78. http://dx.doi.org/10.1080/10426509608046360.

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Hafeez, Muhammad, et Muhammad Riaz. « Aminopyridine stabilized group-IV metal complexes and their applications ». Applied Petrochemical Research 6, no 4 (17 octobre 2016) : 307–40. http://dx.doi.org/10.1007/s13203-016-0170-1.

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Soriaga, Rosanna A. D., Jennifer M. Nguyen, Thomas A. Albright et David M. Hoffman. « Diamagnetic Group 6 Tetrakis(di-tert-butylketimido)metal(IV) Complexes ». Journal of the American Chemical Society 132, no 51 (29 décembre 2010) : 18014–16. http://dx.doi.org/10.1021/ja108265y.

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Smolensky, Elena, Moshe Kapon et Moris S. Eisen. « Intermolecular Hydroamination of Methylenecyclopropane Catalyzed by Group IV Metal Complexes ». Organometallics 26, no 18 (août 2007) : 4510–27. http://dx.doi.org/10.1021/om700455e.

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Sietzen, Malte, Hubert Wadepohl et Joachim Ballmann. « A Novel Trisamidophosphine Ligand and Its Group(IV) Metal Complexes ». Organometallics 33, no 3 (24 janvier 2014) : 612–15. http://dx.doi.org/10.1021/om401018f.

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9

Patel, Dipti, et Stephen T. Liddle. « f-Element-metal bond chemistry ». Reviews in Inorganic Chemistry 32, no 1 (1 juin 2012) : 1–22. http://dx.doi.org/10.1515/revic.2012.0001.

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AbstractCompared to the overwhelming prevalence of f-element-carbon, -nitrogen, -oxygen or -halide ligand linkages, the use of metal-based fragments as ligands is underdeveloped. This contrasts directly to the extensively developed fields of d- and p-block metal-metal complexes, which are still burgeoning. This review outlines the development of compounds that possess polarised covalent f-element-metal bonds. For this review, the f-element is defined as (i) a group 3 metal; (ii) a lanthanide metal; (iii) the actinide metals thorium or uranium. The metal is defined as: (i) a d-block transition metal; (ii) a group 13 metal (aluminium or gallium); (iii) a group 14 metal (silicon, germanium or tin); (iv) a group 15 metal (antimony or bismuth) metal. Although silicon, germanium and antimony are traditionally classified as metalloids, they are included for completeness. We focus on complexes that have been structurally authenticated by single crystal X-ray diffraction, and we highlight novel aspects of their syntheses, properties and reactivities.
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10

Han, Chong, Jonathan P. Lee, Emil Lobkovsky et John A. Porco. « Catalytic Ester−Amide Exchange Using Group (IV) Metal Alkoxide−Activator Complexes ». Journal of the American Chemical Society 127, no 28 (juillet 2005) : 10039–44. http://dx.doi.org/10.1021/ja0527976.

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11

Siddiqi, K. S., Fathi M. A. M. Aqra, S. A. Shah et S. A. A. Zaidi. « Group IV Metal Complexes of the Dithiocarbamate Ligahd Derived from Propanediamine ». Synthesis and Reactivity in Inorganic and Metal-Organic Chemistry 23, no 5 (mai 1993) : 685–93. http://dx.doi.org/10.1080/15533179308016852.

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Rossini, Aaron J., Ryan W. Mills, Graham A. Briscoe, Erin L. Norton, Stephen J. Geier, Ivan Hung, Shaohui Zheng, Jochen Autschbach et Robert W. Schurko. « Solid-State Chlorine NMR of Group IV Transition Metal Organometallic Complexes ». Journal of the American Chemical Society 131, no 9 (11 mars 2009) : 3317–30. http://dx.doi.org/10.1021/ja808390a.

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13

JALIL, N. S. N. « ChemInform Abstract : Complexes of Benzothiazole with Some Group IV Metal Halides. » ChemInform 22, no 51 (22 août 2010) : no. http://dx.doi.org/10.1002/chin.199151188.

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Wächtler, Erik, Robert Gericke, Erica Brendler, Birgit Gerke, Thorsten Langer, Rainer Pöttgen, Lyuben Zhechkov, Thomas Heine et Jörg Wagler. « Group 10–group 14 metal complexes [E–TM]IV : the role of the group 14 site as an L, X and Z-type ligand ». Dalton Transactions 45, no 36 (2016) : 14252–64. http://dx.doi.org/10.1039/c6dt01621a.

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15

Normand, Adrien T., Raluca Malacea-Kabbara, Rosita Lapenta, Aymeric Dajnak, Philippe Richard, Hélène Cattey, Anaëlle Bolley et al. « Phosphasalen group IV metal complexes : synthesis, characterization and ring opening polymerization of lactide ». Dalton Transactions 49, no 21 (2020) : 6989–7004. http://dx.doi.org/10.1039/d0dt00972e.

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A series of discrete mononuclear neutral and cationic phosphasalen Ti and Zr complexes has been isolated and characterized. For the first time, a cationic group IV metal complex was found active in the ROP of LA.
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16

Wiśniewska, Dorota, Zofia Janas, Piotr Sobota et Lucjan B. Jerzykiewicz. « Dimethyl Group IV Metal Complexes of the OSO-Type Ligand Bearing AlMe2Moieties ». Organometallics 25, no 26 (décembre 2006) : 6166–69. http://dx.doi.org/10.1021/om0608051.

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17

Neelam Jalil, N. S., et S. Aminu. « Complexes of Some Group IV Metal Tetrahalides and Organotins with Barbituric Acid ». Synthesis and Reactivity in Inorganic and Metal-Organic Chemistry 26, no 3 (1 mars 1996) : 385–98. http://dx.doi.org/10.1080/00945719608005113.

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Neelam Jalil, N. S., et F. Tolorunjo. « Complexes of Some Group IV Metal Halides, Acetate and Organotins with Thioacetamide ». Synthesis and Reactivity in Inorganic and Metal-Organic Chemistry 27, no 10 (novembre 1997) : 1581–91. http://dx.doi.org/10.1080/00945719708003161.

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Neelam Jalil, N. S., et Lara T. Hameed. « Complexes of Some Group IV Metal Halides with Glycine, Leucine and Cystine ». Synthesis and Reactivity in Inorganic and Metal-Organic Chemistry 25, no 10 (décembre 1995) : 1633–51. http://dx.doi.org/10.1080/15533179508014687.

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Yadav, Jyoti, et Jai Devi. « Antimicrobial and Antioxidant Activities of Diorganotin(IV) Complexes Synthesized from 1,2,4-Triazole Derivatives ». Asian Journal of Chemistry 32, no 10 (2020) : 2553–58. http://dx.doi.org/10.14233/ajchem.2020.22819.

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Novel diorganotin(IV) complexes were synthesized from 1,2,4-triazole Schiff base ligands which were synthesized by reaction between the 4-amino-5-phenyl-1,2,4-triazole-3-thiol and salicyaldehyde derivatives. The bonding and geometry of the diorganotin(IV) complexes were evaluated by using different spectroscopic techniques such as FT-IR, mass, 1H, 13C & 119Sn NMR. The different spectroscopic techniques revealed the tridentate (ONS) mode of chelation of Schiff base ligands and pentacoordinated environment around the central tin metal which was satisfied with azomethine nitrogen, phenolic oxygen, thiolic sulfur and metal-carbon bond of alkyl/aryl group. The Schiff base ligands and their organotin(IV) complexes were tested for their in vitro antimicrobial and antioxidant activities to examine the biological outline of complexes in comparison to standard drugs. The results of activities data revealed that diorganotin(IV) complexes are more active than Schiff base ligands and some diorganotin(IV) complexes are even more active than the standard drugs. In all the synthesized complexes, compound 9 (Bu2SnL2) and 10 (Ph2SnL2) were most potent and can be used in future clinical trials.
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21

Deblonde, Gauthier J. P., Trevor D. Lohrey et Rebecca J. Abergel. « Inducing selectivity and chirality in group IV metal coordination with high-denticity hydroxypyridinones ». Dalton Transactions 48, no 23 (2019) : 8238–47. http://dx.doi.org/10.1039/c9dt01031a.

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22

Han-Mou, Gau, Chen Chi-Tain et Schei Chi-Chang. « Synthesis, characterizations, and structures of group IV metal-chromium complexes bridged by the benzyloxide group ». Journal of Organometallic Chemistry 424, no 3 (février 1992) : 307–17. http://dx.doi.org/10.1016/0022-328x(92)80006-j.

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23

Tariq, Muhammad, Ahmad Kaleem Qureshi, Muhammad Hamid, Naseem Abbas, Ajaz Hussain et Muhammad Naeem Khan. « Organotin (IV) based Rabeprazole and Pregabalin Complexes Formation and Biocidal Investigation ». Acta Chemica Malaysia 4, no 1 (1 juin 2020) : 17–23. http://dx.doi.org/10.2478/acmy-2020-0003.

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AbstractNew organotin (IV) complexes with NaL1 (sodium salt of 2-[[4-(3-methoxy-propoxy) 3-methylpyridin-2-yl]methylsulfinyl]benzimidazol-1-ide) and NaL2 (sodium salt of 3- aminomethyl-5-methylhexanoic acid) were synthesized by the reaction of diorganotin (IV) and triorganotin (IV) salt (Bu3SnCl, Ph3SnCl, Bu2SnCl2, Me2SnCl2) using the solvent (dry toluene) by constant stirring and refluxing. All the organotin (IV) complexes were characterized by different diagnostic techniques such as FT-IR (Infra-red) and UV-visible spectroscopy. The results exhibited that ligand NaL1 (sodium salt) is attached to tin metal by a nitrogen atom of benzimidazole ring and the oxygen atom of the sulfonyl group. While ligand NaL2 (sodium salt) coordinate with tin(IV) moiety through oxygen atom of the carboxylate group. The newly synthesized complexes 1 & 2 of ligand NaL1 (sodium salt) showed trigonal bipyramidal geometry while complexes 3 & 4 octahedral geometry around tin(IV) centre. The organotin(IV) complexes 5-7 of ligand NaL2 (sodium salt) have the tetrahedral geometry around tin(IV) centre. The synthesized complexes (1-7) were tested for antifungal and antibacterial microbial activities. All the complexes showed significant antibacterial and anti-fungal activities against tested bacterial and fungal strains.
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24

Siddiqi, K. S., Fathi M. A. M. Aqra, S. A. Shah et S. A. A. Zaidi. « Synthesis and Characterization of Pyrrolidine-N-carbodithioate and Its Group IV Metal Complexes ». Synthesis and Reactivity in Inorganic and Metal-Organic Chemistry 24, no 3 (mars 1994) : 353–63. http://dx.doi.org/10.1080/00945719408000116.

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Izawa, Mondo, Akito Nakai, Taisuke Suito, Takayuki Tanaka et Atsuhiro Osuka. « [38]Octaphyrin bis-Sn(IV) complexes with unique coordination geometries ». Journal of Porphyrins and Phthalocyanines 25, no 05n06 (18 janvier 2021) : 400–406. http://dx.doi.org/10.1142/s1088424621500103.

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Metal complexation of octaphyrin(1.1.1.1.1.1.1.1) triggers unique ring-fixation aptitudes or unexpected rearrangement (cleavage) reactions. In this paper, a unique complexation behavior of [38]octaphyrin upon tin(IV) metalation is showcased. Two new [38]octaphyrin bis-Sn(IV) complexes 2Sn and 3Sn were isolated and characterized as weakly aromatic molecules. While 2Sn with the [Formula: see text] molecular symmetry displayed a similar characteristic to octaphyrin bis-Si(IV) and bis-Ge(IV) complexes reported previously, 3Sn showed a different coordination mode that is fixed by intramolecular hydrogen bondings between pyrrolic NH and axially ligated OH on the tin ion as revealed by X-ray diffraction analysis. An unexpected dimeric structure was also observed during an attempt to grow crystals of 2Sn. These characteristic behaviors indicate that the ring-fixation aptitude of octaphyrin is quite sensitive to the nature of metal ions even for the same group 14 elements.
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Chiang, Cheng-Hung, et Jing-Cherng Tsai. « Hydrogenation of polystyrene-b -polybutadiene-b -polystyrene mediated by group (IV) metal metallocene complexes ». Journal of Polymer Science Part A : Polymer Chemistry 55, no 13 (25 avril 2017) : 2141–49. http://dx.doi.org/10.1002/pola.28589.

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Bhanuka, Sunita, Sarita Khaturia, Mamta Chahar et Har Lal Singh. « Design, Spectroscopic Characterization and Theoretical Studies of Organotin(IV) and Organosilicon(IV) Complexes with Schiff Base Ligands Derived from Amino Acids ». Asian Journal of Chemistry 32, no 11 (2020) : 2821–28. http://dx.doi.org/10.14233/ajchem.2020.22850.

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A new series of organotin(IV) and organosilicon(IV) complexes were synthesized using the Schiff base ligands [2-((3,4-dimethoxybenzylidene)amino)-3-(1H-indol-3-yl)propanoic acid (L1H) and 2-((3,4-dimethoxybenzylidene)amino)-3-methylbutanoic acid (L2H)]. The synthesized compounds were characterized by IR, NMR (1H and13C), elemental analysis and theoretical studies. The molar conductivity values of the complexes in DMF implied the presence of non-electrolyte species. Spectral data showed that in these complexes the metal atoms are coordinated with the Schiff base ligand acts as a bidentate ON moiety, coordinating to the metal through its carboxylate oxygen and imine nitrogen. The IR spectra of the complexes showed large differences between νasy(COO) and νsy(COO), Δν (νasy(COO)–νsy(COO)) of 260-276 cm–1, indicating monodentate nature of the carboxylate group. Furthermore, the density functional theory (DFT) calculations were executed at the B3LYP/6-31G(d,p)/ LanL2DZ basis set of theory for the optimized geometry of Schiff base complexes. The structural parameters, bond length, bond angles, chemical potential, electronegativity, hardness, softness, global electrophilicity index have been studied theoretically by density functional theory (DFT) to support the experimental results.
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Shaker, Shayma A. « Preparation and Spectral Properties of Mixed-Ligand Complexes of VO(IV), Ni(II), Zn(II), Pd(II), Cd(II) and Pb(II) with Dimethylglyoxime andN-acetylglycine ». E-Journal of Chemistry 7, s1 (2010) : S580—S586. http://dx.doi.org/10.1155/2010/125136.

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A number of mixed-ligand complexes of the general formula [M(D)(G)] where D=dimethylglyoximato monoanion, G=N-acetylglycinato and M=VO(IV), Ni(II), Zn(II), Pd(II), Cd(II) and Pb(II) were prepared. Each complex was characterized by elemental analysis, determination of metal, infrared spectra, electronic spectra, (1H and13C) NMR spectra, conductivity and magnetic moments. All these complexes were not soluble in some of the organic solvent but highly soluble in dimethylformamide. The conductivity data showed the non-electrolytic nature of the complexes. The electronic spectra exhibited absorption bands in the visible region caused by the d-d electronic transition such as VO(IV), Ni(II) and Pd(II). The IR and (1H,13C) NMR spectra which have indicate that the dimethylglyoxime was coordinated with the metal ions through the N and O atoms of the oxime group andN-acetylglycine was coordinated with metal ions through the N atom and terminal carboxyl oxygen atom.
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29

Armaghan, Mahsa, Mahdi Mirzaee, Mahmood Norouzi, Mostafa M. Amini et Hamid Reza Khavasi. « Synthesis, Characterisation, and X-Ray Crystal Structures of 8-Hydroxyquinoline Complexes of Group IV Metal Alkoxides ». Australian Journal of Chemistry 66, no 12 (2013) : 1587. http://dx.doi.org/10.1071/ch13420.

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Stoichiometric reaction of 8-hydroxyquinoline with titanium tetraethoxide, and zirconium and hafnium tetra-2-propoxide in toluene at room temperature resulted in formation of [M2-μ-(OR)2-(C9H6NO)2(OR)2] (1: M = Ti, R = Et; 2: M = Zr, R = iPr; 3: M = Hf, R = iPr). All complexes were characterised by infrared, ultraviolet-visible, and NMR spectroscopy, and mass spectrometry. The molecular structures of 1, 2, and 3 were determined by single-crystal X-ray diffraction. The coordination geometries around the metal ions are distorted octahedral, which share an edge through bridged alkoxy groups. Each anionic 8-quinolinolate ligand is also chelated to one metal ion through its pyridine nitrogen and phenolate oxygen atoms.
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Shadab, Mohd, et Mohammad Aslam. « Synthesis and Characterization of Some Transition Metal complexes with N-phenyl-N’-[substituted phenyl] Thiourea ». Material Science Research India 11, no 1 (30 août 2014) : 83–89. http://dx.doi.org/10.13005/msri/110111.

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A series of thiourea ligand , N-N'- diphenyl thiourea [I] [DPTH], N-phenyl-N'-[2-phenoyl] thiourea [II] [PPTH], N-phenyl-N'-[2-chlorophenyl] thiourea III [PCPTH], N-phenyl-N'- [5-chloro-2-methyl phenyl] thiourea IV [PCMPTH] and N- phenyl -N'-(5-chloro-2-methoxy phenyl) thiourea V (PCMTPTH) and their transition metal complexes of the type ML2 and ML2 Cl2 have been synthesized by reacting phenyl isothiocyanate with substituted aniline and transition metal salts. These newly synthesized ligands and their complexes were characterized by elemental and spectral studies. Based upon these studies it was revealed that in all the cases metal is coordinated through suphur group of thioamide of ligands. In case of nickel complexes, the nickel is coordinated to both oxygen and sulphur. In all the complexes metal is tetra coordinated forming a square planer geometry.
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Miyazaki, Takamasa, Yoshiaki Tanabe, Masahiro Yuki, Yoshihiro Miyake et Yoshiaki Nishibayashi. « Synthesis, Structure, and Reactivity of Group VI Metal Complexes Bearing Group IV Metallocenyldiphosphine Moieties and a Pentamethylcyclopentadienyl Ligand ». Organometallics 32, no 6 (8 mars 2013) : 2007–13. http://dx.doi.org/10.1021/om400088d.

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Jamhour, Rasheed M. A. Q. « Poly(4-vinylpyridine N-oxide) as a Ligand : Its Complexes with Group IV Metal Tetrachlorides and Organotin(IV) Chlorides ». Synthesis and Reactivity in Inorganic and Metal-Organic Chemistry 27, no 2 (février 1997) : 221–30. http://dx.doi.org/10.1080/00945719708000147.

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Dong-Dong, Mn, Zhai Jian-Feng, Wang Zhi-Wen et Shen Yu-Quan. « Synthesis and fluorescent properties of bis-salicyloyl hydrazide metal complexes of some group IV ions ». Chinese Journal of Chemistry 16, no 5 (27 août 2010) : 473–77. http://dx.doi.org/10.1002/cjoc.19980160515.

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Jantunen, Kimberly C., Brian L. Scott et Jaqueline L. Kiplinger. « A comparative study of the reactivity of Zr(IV), Hf(IV) and Th(IV) metallocene complexes : Thorium is not a Group IV metal after all ». Journal of Alloys and Compounds 444-445 (octobre 2007) : 363–68. http://dx.doi.org/10.1016/j.jallcom.2007.03.138.

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35

Supuran, Claudiu T., Andrea Scozzafava et Andrei Jitianu. « Carbonic Anhydrase Inhibitors. Part 541 : Metal Complexes of Heterocyclic Sulfonamides : A New Class of Antiglaucoma Agents ». Metal-Based Drugs 4, no 6 (1 janvier 1997) : 307–15. http://dx.doi.org/10.1155/mbd.1997.307.

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Metal complexes of heterocyclic sulfonamides possessing carbonic anhydrase (CA) inhibitory properties were recently shown to be useful as intraocular pressure (IOP) lowering agents in experimental animals, and might be developed as a novel class of antiglaucoma drugs. Here we report the synthesis of a heterocyclic sulfonamide CA inhibitor and of the metal complexes containing main group metal ions, such as Be(II), Mg(II), Al(III), Zn(II), Cd(II) and Hg(II) and the new sulfonamide as well as 5-amino-1,3,4-thiadiazole-2-sulfonamide as ligands. The new complexes were characterized by standard physico-chemical procedures, and assayed as inhibitors of three CA isozymes, CA I, II and IV. Some of them (but not the parent sulfonamides) strongly lowered IOP in rabbits when administered as a 2% solution into the eye.
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El-Megharbel, Samy M., Safa H. Qahl, Fatima S. Alaryani et Reham Z. Hamza. « Synthesis, Spectroscopic Studies for Five New Mg (II), Fe (III), Cu (II), Zn (II) and Se (IV) Ceftriaxone Antibiotic Drug Complexes and Their Possible Hepatoprotective and Antioxidant Capacities ». Antibiotics 11, no 5 (20 avril 2022) : 547. http://dx.doi.org/10.3390/antibiotics11050547.

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Magnesium, copper, zinc, iron and selenium complexes of ceftriaxone were prepared in a 1:1 ligand to metal ratio to investigate the ligational character of the antibiotic ceftriaxone drug (CFX). The complexes were found to have coordinated and hydrated water molecules, except for the Se (IV) complex, which had only hydrated water molecules. The modes of chelation were explained depending on IR, 1HNMR and UV–Vis spectroscopies. The electronic absorption spectra and the magnetic moment values indicated that Mg (II), Cu (II), Zn (II), Fe (III) and Se (VI) complexes form a six-coordinate shape with a distorted octahedral geometry. Ceftriaxone has four donation sites through nitrogen from NH2 amino, oxygen from triazine, β-lactam carbonyl and carboxylate with the molecular formulas [Mg(CFX)(H2O)2]·4H2O, [Cu(CFX)(H2O)2]·3H2O, [Fe(CFX)(H2O)(Cl)]·5H2O, [Zn(CFX)(H2O)2]·6H2O and [Se(CFX)(Cl)2]·4H2O and acts as a tetradentate ligand towards the five metal ions. The morphological surface and particle size of ceftriaxone metal complexes were determined using SEM, TEM and X-ray diffraction. The thermal behaviors of the complexes were studied by the TGA(DTG) technique. This study investigated the effect of CFX and CFX metal complexes on oxidative stress and severe tissue injury in the hepatic tissues of male rats. Fifty-six male rats were tested: the first group received normal saline (1 mg/kg), the second group received CFX orally at a dose of 180 mg/kg, and the other treated groups received other CFX metal complexes at the same dose as the CFX-treated group. For antibacterial activity, CFX/Zn complex was highly effective against Streptococcus pneumoniae, while CFX/Se was highly effective against Staphylococcus aureus and Escherichia coli. In conclusion, successive exposure to CFX elevated hepatic reactive oxygen species (ROS) levels and lipid peroxidation final marker (MDA) and decreased antioxidant enzyme levels. CFX metal complex administration prevented liver injury, mainly suppressing excessive ROS generation and enhancing antioxidant defense enzymes and in male rats.
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Matsumoto, Kazuya, Yuto Sezaki, Sumito Yamakawa, Yuki Hata et Mitsutoshi Jikei. « Selective and Mutual Separation of Palladium (II), Platinum (IV), and Rhodium (III) Using Aliphatic Primary Amines ». Metals 10, no 3 (29 février 2020) : 324. http://dx.doi.org/10.3390/met10030324.

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The selective recovery of platinum-group metals (PGMs) remains a huge challenge. Although solvent extraction processes are generally used for PGM separation, the use of organic solvents is problematic because of their toxicity and environmental concerns. Here, we have developed a new PGM recovery method by precipitation from hydrochloric acid (HCl) solutions containing Pd(II), Pt(IV), and Rh(III) using aliphatic primary amines as precipitants. Pt(IV) was precipitated using the amines with alkyl chains longer than hexyl independent of HCl concentration. The precipitation of Pd(II) required longer alkyl amines than octyl, regardless of the HCl concentration. Rh(III) was recovered by precipitation at high HCl concentrations using the amines longer than hexyl. The mutual separation of Pt(IV), Rh(III), and Pd(II), in this order, was successfully achieved by changing the HCl concentrations and alkyl chain lengths of the amines. X-ray photoelectron spectroscopy and thermogravimetric analysis evidently showed that the metal-containing precipitates were ion-pair complexes composed of metal chloro-complex anions and ammonium cations.
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38

Baiz, Tamam I., et Joseph A. R. Schmidt. « A Discrete Ortho-Lithiated Acetophenone Imine Derivative : Isolation, Characterization, and Synthesis of Group IV Metal Complexes ». Organometallics 26, no 17 (août 2007) : 4094–97. http://dx.doi.org/10.1021/om700530z.

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Siddiqi, K. S., F. Arjmand, S. Tabassum et S. A. A. Zaidi. « Schiff Base Complexes as Ligands. Bimetallic Chelates of [M(SB-H2)]Cl2with Group IV Metal Tetrachlorides ». Synthesis and Reactivity in Inorganic and Metal-Organic Chemistry 25, no 6 (juillet 1995) : 0955–64. http://dx.doi.org/10.1080/15533179508218273.

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40

Driessen, W. L., et W. L. Groeneveld. « Complexes with ligands containing the carbonyl group. Part IV Metal(II) Butanone, Acetophenone, and Chloroacetone Solvates ». Recueil des Travaux Chimiques des Pays-Bas 90, no 3 (2 septembre 2010) : 258–64. http://dx.doi.org/10.1002/recl.19710900304.

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41

Krivokapic, A., H. L. Anderson, G. Bourhill, R. Ives, S. Clark et K. J. McEwan. « Meso-Tetra-Alkynyl Porphyrins for Optical Limiting—A Survey of Group III and IV Metal Complexes ». Advanced Materials 13, no 9 (mai 2001) : 652–56. http://dx.doi.org/10.1002/1521-4095(200105)13:9<652 ::aid-adma652>3.0.co;2-3.

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42

Takahashi, Kazuhiro, et Yuzo Nishida. « Synthesis and Structural Systematics of First-Row Transition Metal Complexes with 2-[Bis(benzimidazol-2-ylmethyl)amino]ethanol ». Zeitschrift für Naturforschung B 42, no 10 (1 octobre 1987) : 1307–14. http://dx.doi.org/10.1515/znb-1987-1016.

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Abstract A nickel(II) complex with (bbimae) (= 2-[bis(benzimidazol-2-ylmethyl)amino]ethanol), [Ni(bbimae)(NCS)2] · H2O (1) and an oxovanadium(IV) complex, [VO(bbimae)(NCS)2] · dma (dma = N.N-dimethylacetamide) (2) have been prepared and their crystal structures determined by X-ray diffraction. Crystal data for 1 at 293 K: a = 13.334(2). b = 17.048(2), c = 10.3829(9) Å, space group P212121, Z = 4, and dcalcd = 1.41 gcm-3. Crystal data for 2 at 293 K: a = 14.099(2). b = 14.998(4), c = 14.051(2) Å, β = 107.634(9)°, space group P21/c, Z = 4, and dcalcd = 1.36 gcm-3. In the nickel(II) complex, (bbimae) functions as a tetradentate ligand, and the geometry around Ni(II) ion is best described as distorted octahedral. The structure is very similar to those of the correspond­ing Co(II) and Mn(II) complexes. In the case of 2, which is also distorted octahedral, (bbimae) is a tridentate ligand without the coordination of the alcohol group. The M-N (benzimidazole) distances are in the range of 1.95-2.18 Å, and also observed for other first-row transition metal complexes with (bbimae). and differ in the order V(IV) < Mn(II) > Co(II) > Ni(II) > Cu(II). consistent with effective ionic radii of the metal ions. Comparison of the structural parameters of these complexes with those of the metal ions in biological systems has supported the usefulness of the tripod-like ligands to synthesis model compounds for biological systems.
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43

El-Attar, Mohamed S., Sadeek A. Sadeek, Sherif M. Abd El-Hamid et Hazem S. Elshafie. « Spectroscopic Analyses and Antimicrobial Activity of Novel Ciprofloxacin and 7-Hydroxy-4-methylcoumarin, the Plant-Based Natural Benzopyrone Derivative ». International Journal of Molecular Sciences 23, no 14 (20 juillet 2022) : 8019. http://dx.doi.org/10.3390/ijms23148019.

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Coumarin is highly distributed in nature, notably in higher plants. The biological features of coumarin include antibacterial, anticancer and antioxidant effects. It is well known that metal ions present in complexes accelerate the drug action and the efficacy of organic therapeutic agents. The main aim of the current study is the synthesis of different complexes of the interaction between ciprofloxacin hydrochloride (CIP) and coumarin derivative 7-hydroxy-4-methylcoumarin (HMC) with Zr(IV). The chelates of CIP with Zr(IV) were prepared and characterized by elemental analysis, melting point, conductance measurements, spectroscopic techniques involving IR, UV-Vis, 1H NMR, and thermal behavior (TG-DTG) in the presence of HMC, dimethylformamide (DMF), pyridine (Py), and triethylamine (Et3N). Results of molar conductivity tests showed that the new synthesized complexes are electrolytes with a 1:1 or 1:2 electrolyte ratio, with the chloride ions functioning as counter ions. According to IR spectra, CIP acts as a neutral bidentate ligand with Zr(IV) through one carboxylato oxygen and the carbonyl group, HMC as a monodentate through the carbonyl group, and DMF through the oxygen atom of the carbonyl group and the N atom of Py and Et3N. The thermal behavior of the complexes was carefully investigated using TG and DTG techniques. TG findings signal that water molecules are found as hydrated and coordinated. The thermal decomposition mechanisms proposed for CIP, HMC, and Zr(IV) complexes are discussed and the activation energies (Ea), Gibbs free energies (∆G*), entropies (∆S*), and enthalpies (∆H*) of thermal decomposition reactions have been calculated using Coats–Redfern (CR) and Horowitz–Metzeger (HM) methods. The studied complexes were tested against some human pathogens and phytopathogens, including three Gram-positive bacteria (Bacillus subtilis, B. cereus, Brevibacterium otitidis) and three Gram-negative bacteria (Escherichiacoli, Pseudomonas aeruginosa and Klebsiella pneumoniae), and compared to the free CIP and HMC parent compounds.
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Yang, En-Che, Yu-Ying Chang, Shi-Yi Huang, Ling-Xuan Hong, Gene-Hsiang Lee, Hwo-Shuenn Sheu et Chung-Kai Chang. « Novel Structures and Magnetic Properties of Two [Mn2] Complexes with 2,4-di-2-pyridyl-2,4-pentanediol as the Ligand ». Magnetochemistry 5, no 3 (13 juillet 2019) : 43. http://dx.doi.org/10.3390/magnetochemistry5030043.

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Two ligands, 2,4-di-2-pyridyl-2,4-pentanediol (rD and mD), were employed to synthesize two Mn2 complexes, [Mn2(rD)2Br2] (1) and [Mn2(mD)2(H2O)2]Br2 (2). Compound 1 crystallized in a tetragonal space group, P41212, with a novel hamburger shaped structure. A detailed study indicated that compound 1 did not contain a metal–metal bond, but antiferromagnetic coupling was observed between the Mn(III) ions. Compound 2 crystallized in a monoclinic space group, C2/c, with one Mn(II) and the other with Mn(IV). The two manganese ions were bridged by two alkoxide ligands, resulting in ferromagnetic coupling. Magnetic property studies confirm the above assignments.
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45

Okawa, Hisashi, Kaoru Horiuchi, Wakako Kanda, Hiroki Oshio et Sigeo Kida. « Binuclear Metal Complexes. 58. Synthesis and Properties of Mixed-Valence Diiron(III,IV) Complexes of Salen Analogs with Pendant Thioether Group ». Bulletin of the Chemical Society of Japan 59, no 9 (septembre 1986) : 2795–99. http://dx.doi.org/10.1246/bcsj.59.2795.

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46

Elshafie, Hazem S., Sadeek A. Sadeek, Ippolito Camele et Amira A. Mohamed. « Biochemical Characterization of New Gemifloxacin Schiff Base (GMFX-o-phdn) Metal Complexes and Evaluation of Their Antimicrobial Activity against Some Phyto- or Human Pathogens ». International Journal of Molecular Sciences 23, no 4 (14 février 2022) : 2110. http://dx.doi.org/10.3390/ijms23042110.

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Four novel ligand-metal complexes were synthesized through the reaction of Fe(III), pleaseCo(II), Zn(II), and Zr(IV) with Schiff base gemifloxacin reacted with ortho-phenylenediamine (GMFX-o-phdn) to investigate their biological activities. Elemental analysis, FT-IR, 1H NMR, UV-visible, molar conductance, melting points, magnetic susceptibility, and thermal analyses have been carried out for insuring the chelation process. The antimicrobial activity was carried out against Monilinia fructicola, Aspergillus flavus, Penicillium italicum, Botrytis cinerea, Escherichia coli, Bacillus cereus, Pseudomonas fluorescens, and P. aeruginosa. The radical scavenging activity (RSA%) was in vitro evaluated using ABTS method. FT-IR spectra indicated that GMFX-o-phdn chelated with metal ions as a tetradentate through oxygen of carboxylate group and nitrogen of azomethine group. The data of infrared, 1H NMR, and molar conductivity indicate that GMFX–o-phdn reacted as neutral tetra dentate ligand (N2O2) with metal ions through the two oxygen atoms of the carboxylic group (oxygen containing negative charge) and two nitrogen atoms of azomethine group (each nitrogen containing a lone pair of electrons) (the absent of peak corresponding to ν(COOH) at 1715 cm−1, the shift of azomethine group peak from 1633 cm−1 to around 1570 cm−1, the signal at 11 ppm of COOH and the presence of the chloride ions outside the complex sphere). Thermal analyses (TG-DTG/DTA) exhibited that the decaying of the metal complexes exists in three steps with the final residue metal oxide. The obtained data from DTA curves reflect that the degradation processes were exothermic or endothermic. Results showed that some of the studied complexes exhibited promising antifungal activity against most of the tested fungal pathogens, whereas they showed higher antibacterial activity against E. coli and B. cereus and low activity against P. fluorescens and P. aeruginosa. In addition, GMFX-o-phdn and its metal complexes showed strong antioxidant effect. In particular, the parent ligand and Fe(III) complex showed greater antioxidant capacity at low tested concentrations than that of other metal complexes where their IC50 were 169.7 and 164.6 µg/mL, respectively.
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Kulangara, Shaneesh Vadake, Amir Jabri, Yun Yang, Ilia Korobkov, Sandro Gambarotta et Rob Duchateau. « Synthesis, X-ray Structural Analysis, and Ethylene Polymerization Studies of Group IV Metal Heterobimetallic Aluminum-Pyrrolyl Complexes ». Organometallics 31, no 17 (14 août 2012) : 6085–94. http://dx.doi.org/10.1021/om300453a.

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Hu, Ping, Jian-Qiang Wang, Fosong Wang et Guo-Xin Jin. « Preparation, Structure, and Ethylene (Co)Polymerization Behavior of Group IV Metal Complexes with an [OSSO]-Carborane Ligand ». Chemistry - A European Journal 17, no 31 (21 juin 2011) : 8576–83. http://dx.doi.org/10.1002/chem.201100291.

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49

Squattrito, Philip J., Kelly J. Lambright-Mutthamsetty, Patrick A. Giolando et Kristin Kirschbaum. « Crystal structures of two coordination isomers of copper(II) 4-sulfobenzoic acid hexahydrate and two mixed silver/potassium 4-sulfobenzoic acid salts ». Acta Crystallographica Section E Crystallographic Communications 75, no 11 (31 octobre 2019) : 1801–7. http://dx.doi.org/10.1107/s2056989019014610.

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A reaction of copper(II) carbonate and potassium 4-sulfobenzoic acid in water acidified with hydrochloric acid yielded two crystalline products. Tetraaquabis(4-carboxybenzenesulfonato)copper(II) dihydrate, [Cu(O3SC6H4CO2H)2(H2O)4]·2H2O, (I), crystallizes in the triclinic space group P\overline{1} with the Cu2+ ions located on centers of inversion. Each copper ion is coordinated to four water molecules in a square plane with two sulfonate O atoms in the apical positions of a Jahn–Teller-distorted octahedron. The carboxylate group is protonated and not involved in coordination to the metal ions. The complexes pack so as to create a layered structure with alternating inorganic and organic domains. The packing is reinforced by several O—H...O hydrogen bonds involving coordinated and non-coordinated water molecules, the carboxylic acid group and the sulfonate group. Hexaaquacopper(II) 4-carboxybenzenesulfonate, [Cu(H2O)6](O3SC6H4CO2H)2, (II), also crystallizes in the triclinic space group P\overline{1} with Jahn–Teller-distorted octahedral copper(II) aqua complexes on the centers of inversion. As in (I), the carboxylate group on the anion is protonated and the structure consists of alternating layers of inorganic cations and organic anions linked by O—H...O hydrogen bonds. A reaction of silver nitrate and potassium 4-sulfobenzoic acid in water also resulted in two distinct products that have been structurally characterized. An anhydrous silver potassium 4-carboxybenzenesulfonate salt, [Ag0.69K0.31](O3SC6H4CO2H), (III), crystallizes in the monoclinic space group C2/c. There are two independent metal sites, one fully occupied by silver ions and the other showing a 62% K+/38% Ag+ (fixed) ratio, refined in two slightly different positions. The coordination environments of the metal ions are composed primarily of sulfonate O atoms, with some participation by the non-protonated carboxylate O atoms in the disordered site. As in the copper compounds, the cations and anions cleanly segregate into alternating layers. A hydrated mixed silver potassium 4-carboxybenzenesulfonate salt dihydrate, [Ag0.20K0.80](O3SC6H4CO2H)·2H2O, (IV), crystallizes in the monoclinic space group P21/c with the Ag+ and K+ ions sharing one unique metal site coordinated by two water molecules and six sulfonate O atoms. The packing in (IV) follows the dominant motif of alternating inorganic and organic layers. The protonated carboxylate groups do not interact with the cations directly, but do participate in hydrogen bonds with the coordinated water molecules. (IV) is isostructural with pure potassium 4-sulfobenzoic acid dihydrate.
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Khene, Samson, Andrew N. Cammidge, Michael J. Cook et Tebello Nyokong. « Electrochemical and photophysical characterization of non-peripherally-octaalkyl substituted dichlorotin(IV) phthalocyanine and tetrabenzotriazaporphyrin compounds ». Journal of Porphyrins and Phthalocyanines 11, no 10 (octobre 2007) : 761–70. http://dx.doi.org/10.1142/s1088424607000886.

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Three non-peripherally substituted tin(IV) macrocylic compounds, octahexylphthalocyaninato dichlorotin(IV) (3a), octahexyltetrabenzo-5,10,15- triazaporphyrinato dichlorotin(IV) (3b) and octadecylphthalocyaninato dichlorotin(IV) (3c) were synthesized and their photophysical and electrochemical behavior studied. Complex 3b, containing a CH group in place of one of the aza nitrogen atoms of the phthalocyanine core, shows a split Q-band due to its lower symmetry. The triplet state quantum yields were found to be lower than would be expected on the basis of the heavy atom effect of tin as the central metal for phthalocyanine derivatives (3a and 3c). In contrast, 3b shows a triplet quantum yield Φ T = 0.78. The triplet state lifetimes were solvent dependent, and were higher in tetrahydrofuran than in toluene. Cyclic voltammetry and spectroelectrochemistry of the complexes revealed only ring-based redox processes.
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