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Journal articles on the topic 'Metal sandwich compounds'

Author: Grafiati

Published: 6 September 2023

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1

Gribanova, T. N., R. M. Minyaev, and V. I. Minkin. "Multidecker transition metal sandwich compounds." Doklady Chemistry 429, no. 1 (November 2009): 258–63. http://dx.doi.org/10.1134/s0012500809110020.

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2

Fan, Qunchao, Jia Fu, Huidong Li, Hao Feng, Weiguo Sun, Yaoming Xie, R. Bruce King, and Henry F. Schaefer. "Butadiene as a ligand in open sandwich compounds." Physical Chemistry Chemical Physics 20, no. 8 (2018): 5683–91. http://dx.doi.org/10.1039/c7cp07379h.

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Density functional theory shows the lowest energy bis(butadiene)metal structures (C₄H₆)₂M (M = Ti to Ni) to have a staggered orientation of the two butadiene ligands corresponding to a tetrahedral coordination of the central metal atom.

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3

Oeckler, Oliver, Hansjürgen Mattausch, and Arndt Simon. "Einige Phosphidhalogenide des Lanthans und verwandte Verbindungen/ Some Phosphide Halides of Lanthanum and Related Compounds." Zeitschrift für Naturforschung B 62, no. 11 (November 1, 2007): 1377–82. http://dx.doi.org/10.1515/znb-2007-1105.

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The pnictide halides La2I2P, La2I2As, La2I2Sb, La2Br2P and Y2Br2P have been synthesized from lanthanum and yttrium, red phosphorus, arsenic, and antimony, respectively, and the corresponding metal trihalides. Their structures contain close-packed metal atom double layers with pnicogen atoms in the octahedral voids. These layers are sandwiched by halogen atom layers. The compounds crystallize in the trigonal 1T-type with one sandwich-like layer per unit cell, or in the rhombohedral 3R-type with three layers per unit cell. Polytypism and twinning have been observed. For 3R-La2I2P, conductivity measurements have shown metallic behaviour

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4

Mansour, Ahmed M., and Krzysztof Radacki. "Antimicrobial properties of half-sandwich Ir(iii) cyclopentadienyl complexes with pyridylbenzimidazole ligands." Dalton Transactions 49, no. 14 (2020): 4491–501. http://dx.doi.org/10.1039/d0dt00451k.

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Ethyl group determined the toxicity of pyridylbenzimidazole Ir(iii) compounds and exchange of the group with sulfonate led to diminishing of the antibacterial activity. Increasing the metal content per complex, 3, gave rise to a compound with no toxicity.

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5

Brunner, Henri. "Stability of the Metal Configuration in Chiral-at-Metal Half-Sandwich Compounds." European Journal of Inorganic Chemistry 2001, no. 4 (April 2001): 905–12. http://dx.doi.org/10.1002/1099-0682(200104)2001:4<905::aid-ejic905>3.0.co;2-v.

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6

Deb, Mayukh, Jatinder Singh, Shuvadip Mallik, Susanta Hazra, and Anil J. Elias. "Borylation, silylation and selenation of C–H bonds in metal sandwich compounds by applying a directing group strategy." New Journal of Chemistry 41, no. 23 (2017): 14528–38. http://dx.doi.org/10.1039/c7nj02388j.

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7

Znoyko, Serafima A., Alexandra P. Elizavarova, Tatyana V. Kustova, and Anastasiya N. Nakonechnaya. "ERBIUM AND SANDWICH-TYPE LUTETIUM COMPLEXES CONTAINING FRAGMENTS OF TETRAANTHRACHINOPORPHIRAZINE AND SUBSTITUTED PHTHALOCYANINES." IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENII KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA 64, no. 4 (April 11, 2021): 42–51. http://dx.doi.org/10.6060/ivkkt.20216404.6380.

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The present work relates to the synthesis and spectral properties of erbium and sandwich type metal complexes containing tetraanthraquinoporphyrazine as well as phthalocyanine fragments. By reacting tetraanthrachinoporphirazine erbium (lutetium) acetate with excess phthalonitrile, 4-chloro, 4-bromophthalonitrile and unsubstituted phthalonitrile, sandwich-type complexes of an unsymmetrical structure were obtained. The compounds were extracted from the reaction mixture with a suitable organic solvent (DMF or toluene) and purified by prolonged extraction of impurities with acetone in a Soxlet apparatus. Final purification was carried out by column chromatography. The obtained complexes are green solids having solubility in DMSO, DMF, and concentrated sulfuric acid. The composition and structure of complexes were confirmed by elemental analysis, IR and electron spectroscopy. Influence of chemical structure of new "sandwich" compounds on their spectral properties and possible applications has been investigated. In particular, when analyzing the electron absorption spectra, it was found that the metal, the nature of the substituents in the tetraanthraquinone moiety and the replacement of hydrogen atoms with halogen atoms in the phthalocyanine moiety slightly affect the nature and position of the absorption maxima. Studies have been carried out on the coloristic properties of synthesized organosoluble metal complexes erbium and lutetium. The compounds have been found to exhibit the properties of pigments and dyes for polymeric materials such as polystyrene and polyethylene. The temperature parameters of thermal oxidative degradation were determined and it was found that the obtained "sandwich" type phthalocyanines have high resistance to thermal oxidative degradation.

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8

Mercero, Jose M., and Jesus M. Ugalde. "Sandwich-Like Complexes Based on “All-Metal” (Al42-) Aromatic Compounds." Journal of the American Chemical Society 126, no. 11 (March 2004): 3380–81. http://dx.doi.org/10.1021/ja039074b.

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9

Li, Zheng, Zhongliang Tian, Chengzhi Zhang, Fei Wang, Chong Ye, Fei Han, Jun Tan, and Jinshui Liu. "An AlCl3 coordinating interlayer spacing in microcrystalline graphite facilitates ultra-stable and high-performance sodium storage." Nanoscale 13, no. 23 (2021): 10468–77. http://dx.doi.org/10.1039/d1nr01660a.

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10

Chen, Xin, Dongdong Qi, Chao Liu, Hailong Wang, Zheng Xie, Tse-Wei Chen, Shen-Ming Chen, Tien-Wen Tseng, and Jianzhuang Jiang. "Elucidating π–π interaction-induced extension effect in sandwich phthalocyaninato compounds." RSC Advances 10, no. 1 (2020): 317–22. http://dx.doi.org/10.1039/c9ra07847a.

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π–π interaction-linked extension in the perpendicular direction to the monomers and corresponding effect on nonlinear optic properties have been clearly disclosed over the multiple-decker sandwich-type phthalocyaninato metal compounds.

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11

Brunner, Henri. "ChemInform Abstract: Stability of the Metal Configuration in Chiral-at-Metal Half-Sandwich Compounds." ChemInform 32, no. 21 (May 26, 2010): no. http://dx.doi.org/10.1002/chin.200121217.

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12

Nowik, Israel, and Rolfe H. Herber. "Metal Atom Dynamics and Spin-Lattice Relaxation in Multilayer Sandwich Compounds." Hyperfine Interactions 159, no. 1-4 (October 11, 2005): 15–19. http://dx.doi.org/10.1007/s10751-005-9075-6.

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13

Mızrak, Büşra, Efe Baturhan Orman, Şaziye Abdurrahmanoğlu, and Ali Rıza Özkaya. "Synthesis, characterization and electrochemical properties of novel pyridine phthalocyanine derivatives." Journal of Porphyrins and Phthalocyanines 22, no. 01n03 (January 2018): 243–49. http://dx.doi.org/10.1142/s1088424618500207.

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In this study, the novel Zn(II), metal-free and sandwich-type Lu(Pc)2 phthalocyanines containing tetra pyridine substituted at peripheral position were synthesized. All the new compounds have been characterized by FT-IR and UV-vis spectroscopy, [Formula: see text]H-NMR, MALDI-MS and elemental analysis. The electrochemical and spectroelectrochemical properties of all novel metallo- and metal free phthalocyanine compounds were also investigated by voltammetric and in situ spectroelectrochemical measurements on Pt in dimethylsulfoxide/tetrabutylammonium perchlorate.

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14

Ketkov, Sergey. "Substituent effects on the electronic structures of sandwich compounds: new understandings provided by DFT-assisted laser ionization spectroscopy of bisarene complexes." Dalton Transactions 49, no. 3 (2020): 569–77. http://dx.doi.org/10.1039/c9dt04440j.

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15

Hatua, Kaushik, Avijit Mondal, and Prasanta K. Nandi. "Static second hyperpolarizability of inverse sandwich compounds (M1–C5H5–M2) of alkali (M1 = Li, Na, K) and alkaline earth metals (M2 = Be, Mg, Ca)." Physical Chemistry Chemical Physics 20, no. 19 (2018): 13331–39. http://dx.doi.org/10.1039/c8cp01210e.

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In the investigated inverse sandwich complexes, charge transfer from alkali metal (M₁) led to aromatically stabilized Cp ring, which prevented further charge transfer from the alkaline earth metal (M₂).

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16

Chen, Mi-Mi, Fang Ma, Zhi-Ru Li, Zong-Jun Li, Qin Wang, and Chia-Chung Sun. "Series of Metal−Nonmetal−Metal Sandwich Compounds: Out-of-Plane σ-Aromaticity and Electric Properties." Journal of Physical Chemistry A 113, no. 30 (July 30, 2009): 8731–36. http://dx.doi.org/10.1021/jp9038754.

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17

Yao, Chan, Li-Kai Yan, Wei Guan, Chun-Guang Liu, Ping Song, and Zhong-Min Su. "Prediction of second-order optical nonlinearity of porphyrin–metal–polyoxometalate sandwich compounds." Dalton Transactions 39, no. 33 (2010): 7645. http://dx.doi.org/10.1039/c002547j.

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18

Odularu, Ayodele T., Peter A. Ajibade, Johannes Z. Mbese, and Opeoluwa O. Oyedeji. "Developments in Platinum-Group Metals as Dual Antibacterial and Anticancer Agents." Journal of Chemistry 2019 (November 6, 2019): 1–18. http://dx.doi.org/10.1155/2019/5459461.

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Platinum-group (PG) complexes have been used as antibacterial and anticancer agents since the discovery of cisplatin. The science world still requires improvement on these complexes because of multidrug and antineoplastic resistances. This review observes discoverers and history of these platinum-group metals (PGMs), as well as their beneficial applications. The focus of this study was biological applications of PGMs in relation to human health. Sandwich and half-sandwich PGM coordination compounds and their metal nanoparticles give improved results for biological activities by enhancing efficient delivery of both antibacterial and anticancer drugs, as well as luminescent bioimaging (biomarkers) for biological identifications.

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19

Li, Wan-Lu, Cong-Qiao Xu, Shu-Xian Hu, and Jun Li. "Theoretical studies on the bonding and electron structures of a [Au3Sb6]3− complex and its oligomers." Dalton Transactions 45, no. 29 (2016): 11657–67. http://dx.doi.org/10.1039/c6dt00602g.

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Theoretical studies of an all-metal [Sb₃Au₃Sb₃]³⁻ sandwich complex and its congeners [X₃M₃X₃]³⁻ (M = Cu, Ag, Au, Rg; X = N, P, As, Sb, Bi, Uup) as well as [Sb₃(Au₃Sb₃)_n]³⁻ (n = 1–4) oligomers indicate the possible existence of other [A_pM_pA_p]^x− sandwich compounds and oligomers.

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20

Kucera, Benjamin E., Robert E. Jilek, William W. Brennessel, and John E. Ellis. "Bis(pyrene)metal complexes of vanadium, niobium and titanium: isolable homoleptic pyrene complexes of transition metals." Acta Crystallographica Section C Structural Chemistry 70, no. 8 (July 4, 2014): 749–53. http://dx.doi.org/10.1107/s2053229614015290.

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Reduction of VCl3(THF)3(THF is tetrahydrofuran) and NbCl4(THF)2by alkali metal pyrene radical anion salts in THF affords the paramagnetic sandwich complexes bis[(1,2,3,3a,10a,10b-η)-pyrene]vanadium(0), [V(C16H10)2], and bis[(1,2,3,3a,10a,10b-η)-pyrene]niobium(0), [Nb(C16H10)2]. Treatment of tris(naphthalene)titanate(2−) with pyrene provides the isoelectronic titanium species, isolated as an (18-crown-6)potassium salt, namelycatena-poly[[(18-crown-6)potassium]-μ-[(1,2-η:1,2,3,3a,10a,10b-η)-pyrene]-titanate(−I)-μ-[(1,2,3,3a,10a,10b-η:6,7-η)-pyrene]], {[K(C12H24O6)][Ti(C16H10)2]}n. The first two compounds have very similar packing, with neighboring molecules arranged orthogonally to one another, such that aromatic donor–acceptor interactions are likely responsible for the specific arrangement. The asymmetric unit contains a half-occupancy metal center η6-coordinated to one pyrene ligand, with the fullM(pyrene)2molecule generated by a crystallographic inversion center. In the titanium compound, the cations and anions are in alternating contact throughout the crystal structure, in one-dimensional chains along the [101] direction. As in the other two compounds, the asymmetric unit contains a half-occupancy Ti atom η6-coordinated to one pyrene ligand. Additionally, the asymmetric unit contains one half of an (18-crown-6)potassium cation, located on a crystallographic inversion center coincident with the K atom. The full formula units are generated by those inversion centers. In all three structures, the pyrene ligands are eclipsed and sandwich the metals in one of two inversion-related sites. These species are of interest as the first isolable homoleptic pyrene transition metal complexes to be described in the scientific literature.

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21

Chunxiao, Guo, and Liu Juzheng. "ELECTRON STRUCTURE OF OPEN-RING SANDWICH COMPOUNDS OF 3d METAL." Acta Physico-Chimica Sinica 3, no. 01 (1987): 48–54. http://dx.doi.org/10.3866/pku.whxb19870109.

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22

Baird, Michael C. "Catalysis by organotransition metal compounds: Synergism between the pure and the applied1." Canadian Journal of Chemistry 81, no. 4 (April 1, 2003): 330–37. http://dx.doi.org/10.1139/v03-065.

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The modern era of transition-metal-catalyzed polymerization of alkenes began with the Nobel Prize winning work of Ziegler and Natta in the 1950s, but the field has exploded since the mid-1980s and anticipated applications of organometallic catalysts are being spectacularly realized. Our research in metal-catalyzed alkene polymerization began about ten years ago with an investigation of the catalytic applications of half-sandwich complexes of the Group 4 metals, and this lecture will describe our efforts to find both better initiators to make known commercial polymers and new initiators to make novel polymeric materials. Good luck, bad luck, blind alleys, and serendipity have all played key roles in our research, resulting ultimately in a very satisfying convergence of the motives for pure, and the needs of applied, research.Key words: alkene, polymerization, Ziegler, catalysis, carbocationic, titanium.

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23

García-Rodríguez, Raúl, Thomas H. Bullock, Mary McPartlin, and Dominic S. Wright. "Synthesis and structures of tris(2-pyridyl)aluminate sandwich compounds [{RAl(2-py′)2}2M] (py′ = 2-pyridyl, M = Ca, Mn, Fe)." Dalton Trans. 43, no. 37 (2014): 14045–53. http://dx.doi.org/10.1039/c4dt00951g.

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While neither the bridgehead group (R) nor remote ring Me-groups have any impact on metal coordination of tris(2-pyridyl) aluminate ligands [RAl(2-py′)₃]⁻, Me groups adjacent to the donor pyridyl-N atoms have a large effect on their ability to form sandwich arrangements.

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24

Wolfram, Benedikt, Çağla Baş, Christian Kleeberg, and Martin Bröring. "Interaction of manganese corroles with TCNQ and related acceptor molecules." Journal of Porphyrins and Phthalocyanines 24, no. 05n07 (May 2020): 705–11. http://dx.doi.org/10.1142/s1088424619501359.

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Manganese corroles with the Mn atom in the oxidation states +III and +IV have been probed as donor moieties for supramolecular stacked donor–acceptor complexes with the typical acceptor units TCNQ (tetracyanoquinone), TCNP (tetracyanopyrazine), and TCNB (tetracyanobenzene). Four new compounds formed as single crystals from different co-crystallization attempts. In those cases where a Mn(III) corrole was used as the donor component, hydrolyzed and/or oxygenated compounds [(cor)Mn(TCNQ*)] and [(cor*)Mn(TCNP*)] were obtained as the exclusive products. With chloridomanganese(IV) corroles, sandwich-like 2:1 complexes [(cor)MnCl][Formula: see text][TCNQ] and [(cor)MnCl][Formula: see text][TCNB] form, with both components left intact. Crystallographic analyses reveal partial or complete charge transfer to unusual axial ligands and thus prove the high reactivity of Mn(III) corroles in the first two cases. For the sandwich arrangements, almost-unaltered geometric parameters of the Mn(IV) corroles are observed, pointing to negligible structural consequences for metal corroles when engaged in stacking interactions.

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25

Hu, Xin, Michel Trudeau, and David M. Antonelli. "Hydrogen Storage in Microporous Titanium Oxides Reduced by Early Transition Metal Organometallic Sandwich Compounds." Chemistry of Materials 19, no. 6 (March 2007): 1388–95. http://dx.doi.org/10.1021/cm062933l.

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26

Wan, Xin, Xuefeng Wang, Xiaohong Chen, Rong Jin, Quan Du, Yaoming Xie, and R. Bruce King. "1,3-Diphosphacyclobutadiene sandwich compounds as bidentate ligands in metal carbonyl chemistry: Binuclear chromium derivatives." Inorganica Chimica Acta 498 (December 2019): 119123. http://dx.doi.org/10.1016/j.ica.2019.119123.

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27

Yang, Li-ming, Yi-hong Ding, and Chia-chung Sun. "Design of the Sandwich-like Compounds Based on the All-Metal Aromatic Unit Al3−." ChemPhysChem 7, no. 12 (December 4, 2006): 2478–82. http://dx.doi.org/10.1002/cphc.200600564.

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28

Gluyas, Josef B. G., Neil J. Brown, Julian D. Farmer, and Paul J. Low. "Optimised Syntheses of the Half-Sandwich Complexes FeCl(dppe)Cp*, FeCl(dppe)Cp, RuCl(dppe)Cp*, and RuCl(dppe)Cp." Australian Journal of Chemistry 70, no. 1 (2017): 113. http://dx.doi.org/10.1071/ch16322.

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Thanks to their synthetic versatility, the half-sandwich metal chlorides MCl(dppe)(η5-C5R5) [M = Fe, Ru; dppe = 1,2-bis(diphenylphosphino)ethane, R = H (cyclopentadiene, Cp), CH3 (pentamethylcyclopentadiene, Cp*)] are staple starting materials in many organometallic laboratories. Here we present an overview of the synthetic methods currently available for FeCl(dppe)Cp*, FeCl(dppe)Cp, RuCl(dppe)Cp*, and RuCl(dppe)Cp, and describe in detail updated and optimised multigram syntheses of all four compounds.

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29

Gozzi, Marta, Benedikt Schwarze, and Evamarie Hey-Hawkins. "Half- and mixed-sandwich metallacarboranes for potential applications in medicine." Pure and Applied Chemistry 91, no. 4 (April 24, 2019): 563–73. http://dx.doi.org/10.1515/pac-2018-0806.

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Abstract Today, medicinal chemistry is still clearly dominated by organic chemistry, and commercially available boron-based drugs are rare. In contrast to hydrocarbons, boranes prefer the formation of polyhedral clusters via delocalized 3c2e bonds, such as polyhedral dicarba-closo-dodecaborane(12) (closo-C2B10H12). These clusters have remarkable biological stability, and the three isomers, 1,2- (ortho), 1,7- (meta), and 1,12-dicarba-closo-dodecaborane(12) (para), have attracted much interest due to their unique structural features. Furthermore, anionic nido clusters ([7,8-C2B9H11]2−), derived from the neutral icosahedral closo cluster 1,2-dicarba-closo-dodecaborane(12) by deboronation followed by deprotonation are suitable ligands for transition metals and offer the possibility to form metallacarboranes, for example via coordination through the upper pentagonal face of the cluster. The isolobal analogy between the cyclopentadienyl(–1) ligand (Cp−) and [C2B9H11]2− clusters (dicarbollide anion, Cb2−) is the motivation in using Cb2− as ligand for coordination to a metal center to design compounds for various applications. This review focuses on potential applications of half- and mixed-sandwich-type transition metal complexes in medicine.

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30

Ji, Jie, Tianxia Guo, Liyan Qian, Xiaokang Xu, Huanning Yang, Yue Xie, Maoshuai He, Xiaojing Yao, Xiuyun Zhang, and Yongjun Liu. "Ab Initio Study of Structural, Electronic and Magnetic Properties of TM&(B@C60) (TM = V, Cr) Sandwich Clusters and Infinite Molecular Wires." Nanomaterials 12, no. 16 (August 12, 2022): 2770. http://dx.doi.org/10.3390/nano12162770.

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The geometrical structure, electronic and magnetic properties of B-endoped C60 (B@C60) ligand sandwich clusters, TM&(B@C60)2 (TM = V, Cr), and their one-dimensional (1D) infinite molecular wires, [TM&(B@C60)]∞, have been systematically studied using first-principles calculations. The calculations showed that the TM atoms can bond strongly to the pentagonal (η5-coordinated) or hexagonal rings (η6-coordinated) of the endoped C60 ligands, with binding energies ranging from 1.90 to 3.81 eV. Compared to the configurations with contrast-bonding characters, the η6- and η5-coordinated bonding is energetically more favorable for V-(B@C60) and Cr-(B@C60) complexes, respectively. Interestingly, 1D infinite molecular wire [V&(B@C60)-η6]∞ is an antiferromagnetic half-metal, and 1D [Cr&(B@C60)-η5]∞ molecular wire is a ferromagnetic metal. The tunable electronic and magnetic properties of 1D [TM&(B@C60)]∞ SMWs are found under compressive and tensile stains. These findings provide additional possibilities for the application of C60-based sandwich compounds in electronic and spintronic devices.

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31

Herberhold, Max, Thomas Triebner, and Tristram Chivers. "Arsenic(III) and Antimony(III) Thionylimides." Zeitschrift für Naturforschung B 46, no. 2 (February 1, 1991): 169–74. http://dx.doi.org/10.1515/znb-1991-0208.

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The metathetical reactions of potassium thionylimide, KNSO, with arsenic and antimony halides in acetonitrile solution have been used to prepare two series of arsenic and antimony thionylimides, tBu3-nAs(NSO)n and tBu3-nSb(NSO)n, respectively, (n = 3, 2, 1). The tert-butyl- substituted compounds are moisture-sensitive oils. The half-sandwich hydrido-metal complexes CpM(CO)3H react with tBuAs(NSO)2 in THF solution to give the metallo-arsanes [Cp(CO)3M]As(tBu)(NSO) (M = Cr, M o, W).

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32

Schneider, Jörg J., and Dirk Wolf. "Mechanistische Untersuchungen zum reversiblen Gleichgewicht von metallorganischen Tripeldecker- und Sandwichkomplexen des Typs [Bis{(η5-CpR)Co}-μ-{η4:η4-aren}] und [(η5-CpR)Co(η6-aren)] / Mechanistic Studies towards the Reversible Equilibrium between Metal Organic Triple Decker and Sandwich Complexes [Bis{(η5 -CpR)Co}-μ-{η4 :η4-arene}] and [{(η5-CpR)Co(η6-arene)]." Zeitschrift für Naturforschung B 53, no. 11 (November 1, 1998): 1267–72. http://dx.doi.org/10.1515/znb-1998-1105.

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The arene ligand exchange mechanism of slipped arene triple deckers [Bis{(η5-CpR)Co}-μ-{η4:η4-arene}] (R = Me5, 1,2,4 tri-tert butyl, arene = benzene, toluene) 1 was studied by 1H-NMR spectroscopy for different concentrations and solvents. It has been found that triple deckers of type 1 decompose slowly in solution. A unique equilibrium, between these triple deckers and the mixed sandwich complexes [(η6-arene)Co(η5-CpR)] and 14 e [(η5-Cp)Co]solv fragments generated in situ by decomposition o f 1 exists. In addition to this equilibrium arene lability of the thus formed mixed sandwich complex type has been detected by NMR making slipped triple deckers 1 ideal single source compounds for the generation of two [(η5-Cp)Co] fragments in one reaction step. Such fragments are valuable metal ligand components with high synthetic utility in organometallic chemistry.

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33

Chen, Li Na, Yan Li Chen, Pei Hua Zhu, Guo Xin Sun, Hong Yan Wang, and Jian Zhuang Jiang. "Self-Assembled Nano-Structures of Sandwich-Type Mixed (Phthalocyaninato)(porphyrinato) Rear Earth Complexes. Effect of Porphyrin-Phthalocyanine Ligands on Tuning the Inter-Molecular Interaction." Advanced Materials Research 79-82 (August 2009): 341–44. http://dx.doi.org/10.4028/www.scientific.net/amr.79-82.341.

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phthalocyanine, porphyrin, sandwich rare earth complex, nanostructure, self-assembly. Abstract. Three novel sandwich-type mixed (phthalocyaninato)(porphyrinato) rear earth complexes, namely Ce(DPP)(Pc)(1), Sm2(DPP)(Pc)2(2) and Sm2(DPP)2(Pc)(3) [Pc = dianion of phthalocyanine, DPP= dianion of 5,15-di(phenyl)porphyrin], have been fabricated into nano-assemblies onto the SiO2 surface by a surface assisted solvent-vapor annealing method. The effect of the number of porphyrin and phthalocyanine ligands on the morphology of self-assembled nanostructures of these double- and triple-decker complexes has been systematically studied. Competition and cooperation between the inter-molecular - interaction, van der Waals, and metal-ligand coordination for different compounds results in nanostructures with different morphology from approximately spherical shape with average size of ~300 nm and ~400 nm for 1 and 2, respectively, nano-rods with aspect ratio (length over width) around 5 for 3, which were characterized by electronic absorption, X-ray diffraction (XRD), and atomic force microscopy (AFM). Electronic absorption spectroscopic results reveal the formation of J-aggregates in the nano-structures and suggest the increasing - interaction in the order of 3, 1, to 2. Examination by XRD reveal that in the nanostructures of compounds 1-3, a dimeric supramolecular structure was formed through an intermolecular - interaction and/or van der Waals between two sandwich-type molecules, which as the building block self-assembles into the target nanostructures.

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34

Bilyachenko, Alexey N., Victor N. Khrustalev, Anna Y. Zueva, Ekaterina M. Titova, Grigorii S. Astakhov, Yan V. Zubavichus, Pavel V. Dorovatovskii, et al. "A Novel Family of Cage-like (CuLi, CuNa, CuK)-phenylsilsesquioxane Complexes with 8-hydroxyquinoline Ligands: Synthesis, Structure, and Catalytic Activity." Molecules 27, no. 19 (September 21, 2022): 6205. http://dx.doi.org/10.3390/molecules27196205.

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The first examples of metallasilsesquioxane complexes, including ligands of the 8-hydroxyquinoline family 1–9, were synthesized, and their structures were established by single crystal X-ray diffraction using synchrotron radiation. Compounds 1–9 tend to form a type of sandwich-like cage of Cu4M2 nuclearity (M = Li, Na, K). Each complex includes two cisoid pentameric silsesquioxane ligands and two 8-hydroxyquinoline ligands. The latter coordinates the copper ions and corresponding alkaline metal ions (via the deprotonated oxygen site). A characteristic (size) of the alkaline metal ion and a variation of characteristics of nitrogen ligands (8-hydroxyquinoline vs. 5-chloro-8-hydroxyquinoline vs. 5,7-dibromo-8-hydroxyquinoline vs. 5,7-diiodo-8-hydroxyquinoline) are highly influential for the formation of the supramolecular structure of the complexes 3a, 5, and 7–9. The Cu6Na2-based compound 2 exhibits high catalytic activity towards the oxidation of (i) hydrocarbons by H2O2 activated with HNO3, and (ii) alcohols by tert-butyl hydroperoxide. Studies of kinetics and their selectivity has led us to conclude that it is the hydroxyl radicals that play a crucial role in this process.

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35

Munakata, Megumu, Liang Ping Wu, Gui Ling Ning, Takayoshi Kuroda-Sowa, Masahiko Maekawa, Yusaku Suenaga, and Naoto Maeno. "Construction of Metal Sandwich Systems Derived from Assembly of Silver(I) Complexes with Polycyclic Aromatic Compounds." Journal of the American Chemical Society 121, no. 21 (June 1999): 4968–76. http://dx.doi.org/10.1021/ja983950h.

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36

Ivanov, Anton A., Pavel A. Abramov, Mohamed Haouas, Yann Molard, Stéphane Cordier, Clément Falaise, Emmanuel Cadot, and Michael A. Shestopalov. "Supramolecular Host–Guest Assemblies of [M6Cl14]2–, M = Mo, W, Clusters with γ-Cyclodextrin for the Development of CLUSPOMs." Inorganics 11, no. 2 (February 7, 2023): 77. http://dx.doi.org/10.3390/inorganics11020077.

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Host–guest assemblies open up opportunities for developing novel functional CLUSPOM multicomponent systems based on transition metal clusters (CLUS), polyoxometalates (POMs) and macrocyclic organic ligands. In water–ethanol solution γ-cyclodextrin (γ-CD) interacts with halide metal clusters [M6Cl14]2– (M = Mo, W) to form sandwich-type structures. The supramolecular association between the clusters and CDs, however, remains weak in solution, and the interactions are not strong enough to prevent the hydrolysis of the inorganic guest. Although analysis of the resulting crystal structures reveals inclusion complexation, 1H NMR experiments in solution show no specific affinity between the two components. The luminescent properties of the host–guest compounds in comparison with the initial cluster complexes are also studied to evaluate the influence of CD.

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37

Groué, Antoine, Jean-Philippe Tranchier, Geoffrey Gontard, Marion Jean, Nicolas Vanthuyne, and Hani Amouri. "Enantiopure Cyclometalated Rh(III) and Ir(III) Complexes Displaying Rigid Configuration at Metal Center: Design, Structures, Chiroptical Properties and Role of the Iodide Ligand." Chemistry 4, no. 1 (March 12, 2022): 156–67. http://dx.doi.org/10.3390/chemistry4010014.

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Enantiopure N-heterocyclic carbene half-sandwich metal complexes of the general formula [Cp*M(C^C:)I] (M = Rh, Ir; C^C: = NI-NHC; NI-H = Naphthalimide; NHC = N-heterocyclic carbene) are reported. The rhodium compound was obtained as a single isomer displaying six membered metallacycle and was resolved on chiral column chromatography to the corresponding enantiomers (S)-[Cp*Rh(C^C:)I] (S)-2 and (R)-[Cp*Rh(C^C:)I] (R)-2. The iridium congener, however, furnishes a pair of regioisomers, which were resolved into (S)-[Cp*Ir(C^C:)I] (S)-3 and (R)-[Cp*Ir(C^C:)I] (R)-3 and (S)-[Cp*Ir(C^C:)I] (S)-4 and (R)-[Cp*Ir(C^C:)I] (R)-4. These regioisomers differ from each other, only by the size of the metallacycle; five-membered for 3 and six-membered for 4. The molecular structures of (S)-2 and (S)-4 are reported. Moreover, the chiroptical properties of these compounds are presented and discussed. These compounds display exceptional stable configurations at the metal center in solution with enantiomerization barrier ΔG≠ up to 124 kJ/mol. This is because the nature of the naphthalimide-NHC clamp ligand and the iodide ligand contribute to their configuration’s robustness. In contrast to related complexes reported in the literature, which are often labile in solution.

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38

Motswainyana, William M., and Peter A. Ajibade. "Anticancer Activities of Mononuclear Ruthenium(II) Coordination Complexes." Advances in Chemistry 2015 (February 19, 2015): 1–21. http://dx.doi.org/10.1155/2015/859730.

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Ruthenium compounds are highly regarded as potential drug candidates. The compounds offer the potential of reduced toxicity and can be tolerated in vivo. The various oxidation states, different mechanism of action, and the ligand substitution kinetics of ruthenium compounds give them advantages over platinum-based complexes, thereby making them suitable for use in biological applications. Several studies have focused attention on the interaction between active ruthenium complexes and their possible biological targets. In this paper, we review several ruthenium compounds which reportedly possess promising cytotoxic profiles: from the discovery of highly active compounds imidazolium [trans-tetrachloro(dmso)(imidazole)ruthenate(III)] (NAMI-A), indazolium [trans-tetrachlorobis(1H-indazole)ruthenate(III)](KP1019), and sodium trans-[tetrachloridobis(1H-indazole)ruthenate(III)] (NKP-1339) to the recent work based on both inorganic and organometallic ruthenium(II) compounds. Half-sandwich organometallic ruthenium complexes offer the opportunity of derivatization at the arene moiety, while the three remaining coordination sites on the metal centre can be functionalised with various coordination groups of various monoligands. It is clear from the review that these mononuclear ruthenium(II) compounds represent a strongly emerging field of research that will soon culminate into several ruthenium based antitumor agents.

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39

Kacsir, István, Adrienn Sipos, Evelin Major, Nikolett Bajusz, Attila Bényei, Péter Buglyó, László Somsák, Gábor Kardos, Péter Bai, and Éva Bokor. "Half-Sandwich Type Platinum-Group Metal Complexes of C-Glucosaminyl Azines: Synthesis and Antineoplastic and Antimicrobial Activities." Molecules 28, no. 7 (March 29, 2023): 3058. http://dx.doi.org/10.3390/molecules28073058.

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While platinum-based compounds such as cisplatin form the backbone of chemotherapy, the use of these compounds is limited by resistance and toxicity, driving the development of novel complexes with cytostatic properties. In this study, we synthesized a set of half-sandwich complexes of platinum-group metal ions (Ru(II), Os(II), Ir(III) and Rh(III)) with an N,N-bidentate ligand comprising a C-glucosaminyl group and a heterocycle, such as pyridine, pyridazine, pyrimidine, pyrazine or quinoline. The sugar-containing ligands themselves are unknown compounds and were obtained by nucleophilic additions of lithiated heterocycles to O-perbenzylated 2-nitro-glucal. Reduction of the adducts and, where necessary, subsequent protecting group manipulations furnished the above C-glucosaminyl heterocycles in their O-perbenzylated, O-perbenzoylated and O-unprotected forms. The derived complexes were tested on A2780 ovarian cancer cells. Pyridine, pyrazine and pyridazine-containing complexes proved to be cytostatic and cytotoxic on A2780 cells, while pyrimidine and quinoline derivatives were inactive. The best complexes contained pyridine as the heterocycle. The metal ion with polyhapto arene/arenyl moiety also impacted on the biological activity of the complexes. Ruthenium complexes with p-cymene and iridium complexes with Cp* had the best performance in ovarian cancer cells, followed by osmium complexes with p-cymene and rhodium complexes with Cp*. Finally, the chemical nature of the protective groups on the hydroxyl groups of the carbohydrate moiety were also key determinants of bioactivity; in particular, O-benzyl groups were superior to O-benzoyl groups. The IC50 values of the complexes were in the low micromolar range, and, importantly, the complexes were less active against primary, untransformed human dermal fibroblasts; however, the anticipated therapeutic window is narrow. The bioactive complexes exerted cytostasis on a set of carcinomas such as cell models of glioblastoma, as well as breast and pancreatic cancers. Furthermore, the same complexes exhibited bacteriostatic properties against multiresistant Gram-positive Staphylococcus aureus and Enterococcus clinical isolates in the low micromolar range.

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40

Zhao, Yuan-yuan, Ming-yu Zhang, Shu-hong Xu, and Chia-Chung Sun. "Density functional theory study of the B10, B10- and B10+ clusters and their sandwich-type metal compounds." Chemical Physics Letters 432, no. 4-6 (December 2006): 566–71. http://dx.doi.org/10.1016/j.cplett.2006.10.081.

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41

Li, Huidong, Hao Feng, Weiguo Sun, Qunchao Fan, Yaoming Xie, R. Bruce King, and Henry F. Schaefer. "Bis(heptalene) “submarine” metal dimer sandwich compounds (C12H10)2M2 (M = Ti, V, Cr, Mn, Fe, Co, Ni)." Journal of Molecular Modeling 19, no. 7 (August 14, 2012): 2723–37. http://dx.doi.org/10.1007/s00894-012-1540-y.

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42

Siebert, Walter. "2,3-Dihydro-1,3-diborole-Metal Complexes with Activated CH Bonds: Building Blocks for Multilayered Sandwich Compounds." Angewandte Chemie International Edition in English 24, no. 11 (November 1985): 943–58. http://dx.doi.org/10.1002/anie.198509431.

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43

Sun, Zhi, Henry F. Schaefer, Yaoming Xie, Yongdong Liu, and Rugang Zhong. "Does the metal–metal sextuple bond exist in the bimetallic sandwich compounds Cr2(C6H6)2, Mo2(C6H6)2, and W2(C6H6)2?†." Molecular Physics 111, no. 16-17 (September 2013): 2523–35. http://dx.doi.org/10.1080/00268976.2013.798434.

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44

Titov, Aleksei A., Alexander F. Smol’yakov, Oleg A. Filippov, Ivan A. Godovikov, Dmitry A. Muratov, Fedor M. Dolgushin, Lina M. Epstein, and Elena S. Shubina. "Supramolecular Design of the Trinuclear Silver(I) and Copper(I) Metal Pyrazolates Complexes with Ruthenium Sandwich Compounds via Intermolecular Metal−π Interactions." Crystal Growth & Design 17, no. 12 (November 10, 2017): 6770–79. http://dx.doi.org/10.1021/acs.cgd.7b01351.

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45

Singh, Jatinder, Mayukh Deb, and Anil J. Elias. "Palladacycles Based on 8-Aminoquinoline Carboxamides of Cobalt and Iron Sandwich Compounds and a New Method to α-Alkylate Cp Rings of Metal Sandwich Carboxamides." Organometallics 34, no. 20 (October 15, 2015): 4946–51. http://dx.doi.org/10.1021/acs.organomet.5b00504.

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46

Wong, Alan, Simon Sham, Suning Wang, and Gang Wu. "A solid-state 133Cs nuclear magnetic resonance and X-ray crystallographic study of cesium complexes with macrocyclic ligands." Canadian Journal of Chemistry 78, no. 7 (July 1, 2000): 975–85. http://dx.doi.org/10.1139/v00-097.

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We report solid-state NMR determination of the 133Cs chemical shift anisotropy (CSA) for a series of cesium complexes with macrocyclic ligands. It was found that the isotropic 133Cs chemical shifts are related to the number of oxygen atoms to which the Cs+ ion is coordinated. The 133Cs chemical shifts were found to correlate with average Cs-O distances. We also attempt to use the established correlation to deduce Cs+ coordination environment for compounds with unknown structures. We also report the X-ray determination of the crystal structure for Cs(DB18C6)2SCN1/2CH3OH1/2H2O. The compound crystallizes in monoclinic, a = 14.503(2), b = 15.152(3), c = 39.989(6) Å, β = 90.796(8)°, space group P21/c, Z = 8. There are two independent molecules in the asymmetric unit cell where each of the two Cs+ ions is coordinated to two DB18C6 ligand molecules forming a sandwich-type structure.Key words: solid state NMR, alkali metal, 133Cs chemical shift, macrocyclic ligand, crystal structure.

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47

Dang, Li-Long, Tian Chen, Ting-Ting Zhang, Ting-Ting Li, Jun-Liang Song, Ke-Jia Zhang, and Lu-Fang Ma. "Size-Induced Highly Selective Synthesis of Organometallic Rectangular Macrocycles and Heterometallic Cage Based on Half-Sandwich Rhodium Building Block." Molecules 27, no. 12 (June 10, 2022): 3756. http://dx.doi.org/10.3390/molecules27123756.

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The controlled synthesis of organometallic supramolecular macrocycles cages remains interesting and challenging work in the field of supramolecular chemistry. Here, two tetranuclear rectangular macrocycles and an octuclear cage were designed and synthesized utilizing a rigid and functionalized pillar linker, 2,6-bis(pyridin-4-yl)-1,7-dihydrobenzo [1,2-d:4,5-d′]diimidazole (BBI4PY) based on three half-sandwich rhodium building blocks bearing different sizes. X-ray crystallography in combination with 1H NMR spectroscopy elucidated that the two building blocks with shorter spacers only result in rectangular macrocycles. However, the building block of bulkier size to avoid the π-π stacking interactions between two ligands BBI4PY led to the formation of an octuclear cage complex. The latter cage contains two types of metal ions, namely Rh3+ and Cu2+, showing significant characteristics of heterogeneous metal-assembling compounds. In addition, the cage accommodates two free isopropyl ether solvent molecules, thus displaying host–guest behavior.

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48

Wimmer, Katja, Christin Birg, Robert Kretschmer, Tareq M. A. Al-Shboul, Helmar Görls, Sven Krieck, and Matthias Westerhausen. "Novel Synthetic Routes to s-Block Metal 2,5-Diphenylphospholides and Crystal Structures of the Bis(tetrahydrofuran) Complexes of the Potassium, Calcium, and Strontium Derivatives." Zeitschrift für Naturforschung B 64, no. 11-12 (December 1, 2009): 1360–68. http://dx.doi.org/10.1515/znb-2009-11-1216.

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The reduction of 1,4-diphenyl-1,4-bis(diphenylphosphanyl)buta-1,3-diene (1) (1,4-diphenyl- NUPHOS) with potassium in THF yields bis(THF)potassium 2,5-diphenylphospholide (2) which crystallizes with a chain structure. The metathesis reaction of 2 with the iodides of calcium, strontium, and barium leads to the formation of [bis(THF)calcium bis(2,5-diphenylphospholide)] (3), [bis(THF)strontium bis(2,5-diphenylphospholide)] (4), and [bis(THF)barium bis(2,5-diphenylphospholide)] (5). The reaction of M{P(H)SiiPr3}2 with diphenylbutadiyne in THF also leads to the formation of the 2,5-diphenylphospholides of calcium (3), strontium (4), and barium (5). The molecular structures of 2 to 4 are discussed. The environment of the metal atoms is very similar in all these compounds: The metal atoms show an η5 coordination to the phospholide rings forming a bent sandwich complex. The open coordination site is occupied by two THF molecules

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49

Hazra, Susanta, Mayukh Deb, Jatinder Singh, and Anil J. Elias. "Picolinamide as a Directing Group on Metal Sandwich Compounds: sp2C–H Bond Activation and sp3C–H Bond Oxidation." Organometallics 36, no. 9 (April 20, 2017): 1784–94. http://dx.doi.org/10.1021/acs.organomet.7b00143.

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50

Buchler, Johann Walter, Jürgen Hüttermann, and Jürgen Löffler. "Metal Complexes with Tetrapyrrole Ligands. 47. Yttrium(III) Bis(octaalkylporphyrinate)s: Synthesis and Electron Spin Resonance Spectra of Earth Metal Porphyrin Sandwich Compounds." Bulletin of the Chemical Society of Japan 61, no. 1 (January 1988): 71–77. http://dx.doi.org/10.1246/bcsj.61.71.

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