期刊
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
卷 -, 期 38-39, 页码 4444-4451出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ejic.201700575
关键词
Carboranes; Cobalt; Rotamers; Structure elucidation; Substituent effects
资金
- Russian Science Foundation [16-13-10331]
- Russian Science Foundation [16-13-10331] Funding Source: Russian Science Foundation
Methylsulfanyl derivatives of cobalt bis(dicarbollide), [8,8'-(MeS)(2)-3,3-Co(1,2-C2B9H10)(2)](-), [4,4-(MeS)(2)-3,3-Co(1,2-C2B9H10)(2)](-), and [4,7-(MeS)(2)-3,3'-Co(1,2-C2B9H10)(2)](-), were synthesized through the reactions of CoCl2 with [10-MeS-7,8-C2B9H11](-) and [9-MeS-7,8-C2B9H11](-) in strong alkaline aqueous media. The 4,4'-(rac) and 4,7'-(meso) isomers were separated by column chromatography as the tetrabutylammonium salts. The structures of [Bu4N][8,8'-(MeS)(2)-3,3'-Co(1,2-C2B9H10)(2)], [Bu4N][4,4-(MeS)(2)-3,3'-Co(1,2-C2B9H10)(2)], and [Bu4N][4,7'-(MeS)(2)-3,3-Co(1,2-C2B9H10)(2)] were determined through single-crystal X-ray diffraction. In the solid state, the rotation of the two dicarbollide ligands with respect to each other is hampered by the formation of intramolecular CH center dot center dot center dot S(Me) hydrogen bonds between the ligands, and this results in the stabilization of definite rotamers, namely, the transoid conformation for the 8,8' isomer and the gauche conformations for the 4,4' and 4,7' isomers. These data are in a good agreement with the results of quantum-chemical calculations.
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