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Synthesis, structure and isomerism of “three-bridge” exo-nido-osmacarborane clusters

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Abstract

The reaction of OsCl2(PPh3)3 with [nido-7-R1-8-R2-C2B9H10]K+ produced a series of new exo-nido-osmacarborane complexes exo-nido-5,6,10-[Cl(Ph3P)2Os]-5,6,10-(μ-H)3-10-H-7-R1-8-R2-7,8-C2B9H6 (1: R1 = R2 = H; 2: R1 = R2 = Me; 3: R1 = R2 = PhCH2; 4: R1 + R2 = 1,2-C6H4(CH2)2; 5: R1 = H, R2 = Me) in which the osmium-containing group is linked to the nido-carborane ligand through three two-electron three-center bonds. Compounds 1—5 are formed as mixtures of symmetric (a) and asymmetric (b) isomers; pure symmetric isomers 2a and 4a were isolated by fractional crystallization, and the mixture of isomers 3a, was quantitatively separated into individual compounds 3a and 3b by column chromatography on silica gel. Detailed analysis of the 31P{1H}, 1H, 11B NMR spectra of 1a,b—5a,b and 2D 1H-1H{11B} and 11B{1H}-11B{1H} NMR spectra of 3a and 3b was performed. The structures of isomers 2a and 4a were confirmed by an X-ray diffraction study. According to the NMR and X-ray diffraction data, the isomerism of exo-nido-complexes 1a,b—5a,b is actually the cis—trans-isomerism of ligand arrangement in the octahedral coordination of the Os atom.

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Authors and Affiliations

  1. A. N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, 28 ul. Vavilova, 117813, Moscow, Russian Federation

    G. D. Kolomnikova, P. V. Petrovskii, P. V. Sorokin, F. M. Dolgushin, A. I. Yanovsky & I. T. Chizhevsky

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  1. G. D. Kolomnikova
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  2. P. V. Petrovskii
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  3. P. V. Sorokin
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  4. F. M. Dolgushin
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  5. A. I. Yanovsky
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  6. I. T. Chizhevsky
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Kolomnikova, G.D., Petrovskii, P.V., Sorokin, P.V. et al. Synthesis, structure and isomerism of “three-bridge” exo-nido-osmacarborane clusters. Russian Chemical Bulletin 50, 706–715 (2001). https://doi.org/10.1023/A:1011381400062

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