Synthesis and structures of binuclear half-sandwich cobalt (III) ortho-carboranedithiolato complexes with silyl-bridged bis(cyclopentadienyl) ligands |
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| Authors: | Xiu-Feng Hou Peng-Cheng Zhang Shu Liu Hui Wang Yue-Jiang Lin Guo-Xin Jin |
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| Institution: | 1. Department of Chemistry and Biochemistry, University of South Carolina, Columbia, SC 29208, USA;2. Department of Chemistry, Texas A&M University, College Station, TX 77843, USA;3. Department of Chemistry, Purdue University, West Lafayette, IN 47907, USA |
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| Abstract: | Five binuclear half-sandwich cobalt complexes, (η5-C5H4)Co(CO)I2]2SiMe2 (3), (η5-C5H4)Co(S2C2B10H10)]2SiMe2 (4), (η5-C5H4)]2Co2(μ2-S2C2B10H10)SiMe2 (5), (η5-C5H3)CoI2](μ-I)(η5-C5H3)Co(CO)I](SiMe2)2 (8), (η5-C5H3)Co(S2C2B10H10)]2(SiMe2)2 (9), were successfully synthesized in moderate yield by the reactions of corresponding ligands, (C5H5)2SiMe2 (1) and (C5H4)2(SiMe2)2 (6), respectively. The molecular structures of 3, 5, 6, 8 and 9 was determined by X-ray crystallographic analysis, which distinctly depict various molecular structures containing the Cp rings and the metal centers with halide or 1,2-dicarba-closo-dodecaborane-1,2-dithiolato ligands. For the (η5-C5H4)2SiMe2 complexes, coordination of the fragments CpCo favors a exo conformation. With the rigid structure of the di-bridged ligand (C5H4)2(SiMe2)2, only cis isomers of the corresponding (η5-C5H3)2(Si2Me2)2 complexes are formed. All the complexes have been well characterized by elemental analysis, NMR and IR spectra. |
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