高等学校化学学报 ›› 2003, Vol. 24 ›› Issue (6): 1031.

• 研究简报 • 上一篇    下一篇

双分子维生素B12模型分子的合成及钴氮键稳定性研究

冯亚青, 张晓东, 孟舒献, 周立山   

  1. 天津大学化工学院, 碳一化学与化工国家重点实验室, 天津 300072
  • 收稿日期:2002-07-01 出版日期:2003-06-24 发布日期:2003-06-24
  • 通讯作者: 冯亚青(1957年出生),女,教授,博士生导师,主要从事应用化学领域的研究.E-mail:yqfeng@tju.edu.cn E-mail:yqfeng@tju.edu.cn
  • 基金资助:

    国家教育部优秀青年教师基金资助

Synthesis of a Dimer-VB12 Model Molecule and Stability of Co-N Bond

FENG Ya-Qing, ZHANG Xiao-Dong, MENG Shu-Xian, ZHOU Li-Shan   

  1. School of Chemical Engineering, State Key Laboratory for C1 Chemical Technology, Tianjin University, Tianjin 300072, China
  • Received:2002-07-01 Online:2003-06-24 Published:2003-06-24

关键词: 维生素B12, 双分子模型分子, 紫外-可见光谱, 平衡常数

Abstract: Vitamin B 12 model molecule, dicyano cobyric mono acid hexamethylester 2f was synthesized from Vitamin B 12 by alcoholysis and acidic hydrolysis. Dicyano-a,b,c,d,e,g-α-f-N-(3-imidazoly) propylamido cobyrinate 3f was synthesized by the reaction between 2f and 3-imidazolylpropylamine hydrochloride. Compound 3f was treated with trifluoroacetic acid to give dimer-vitamin B 12 model molecule 5f. Compound 5f was treated with acidic buffers in methanol and the ring of 5f was opened to give compounds 6f. UV-Vis spectra were determined in buffers with different pH values. The equilibrium constants of Co-N bonds were calculated. K-value of 5f was 552×103, which is much greater than that of monomer vitamin B12 4f. The strength of coordination bonds between the N atom in the side chain of cobyrinate and the Co atom in 5f was much weaker than that in monomer-vitamin B12 4f.

Key words: Vitamin B 12, Dimer Model molecule, UV-Vis spectrum, Equilibrium constants

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