Studies on Coenzyme B12Model Compounds (Ⅲ)--The Synthesis of a Kind of New Alkylcobalt Schiff Base Complexes and Their Stabilities of the Co-C Bond

Abstract

Abstract: In this paper a series of alkylcobalt complexes RCo(SB)Lin which R=CH₃, C₂H₅, C₃H₇, n and i-C₄H₉); L=H₂O; SB=bissalicylaldehyde 2,3-dimethyl-2,3-butadiamine, a kind of new coen-zyme B₁₂model compounds, were synthesized and characterized.The complexes are unstable in methanol. Their Co-C bond breaked in the process of thermolysis or photolysis, the products of which were established by using UV-Vis spectrophotometry and spin trapping ESRtechnology. Also the splitting constants were quantitatively determined. It was concluded that both axial alkyl and equatorial ligand influence the stabilities of Co-Cbond.

Key words: Coenzyme B₁₂model compounds, Co-C Bond, Alkylcobalt complexes, Schiff base, Spin trapping

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Chen Hui-lan, Chen Guan-qing, Miao Bing-wen, Tang Wen-xia . Studies on Coenzyme B₁₂Model Compounds (Ⅲ)--The Synthesis of a Kind of New Alkylcobalt Schiff Base Complexes and Their Stabilities of the Co-C Bond[J]. Chem. J. Chinese Universities, 1991, 12(4): 431.

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Studies on Coenzyme B₁₂Model Compounds (Ⅲ)--The Synthesis of a Kind of New Alkylcobalt Schiff Base Complexes and Their Stabilities of the Co-C Bond

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