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Synthesis and catalytic activity of Ln (III) complexes with an unsymmetrical Schiff base including multi“非汉字符号” C=N—groups

引用

Science China Chemistry 2003年第1期46卷 75-83页

作者：姚克敏李宁沈联芳 Department of Chemistry Zhejiang University Hangzhou 310027 China

A synthetic method for a new unsymmetrical Schiff base and its Ln (III) complexes in-cluding multi C == N— groups is reported. The complexes are characterized by elemental analysis, IR spectra, 1H and 13C NMR, especially 2D-COSY 1H, 1H NMR spectra. The general for-mula of the obtained complexes is [Ln3(TBLY)(NO3)3]·nH2O (Ln = La, n = 3; Ln = Nd, n = 5; Ln = Gd, Dy, Yb, Y, n = 7), where TBLY = tetraglycol aldehyde-2,4-dihydroxy benzaldehyde bis-lysine Schiff base. In addition, the evidence for existence of C == CH—NH— group is supported by the AM1 method. The complexes obtained may be used as a catalyst. Conversion rate of 80% with the viscosity-average molecular weight 220000 for the polymerization of methyl methacrylate (MMA) without addition of any cocatalyst has been obtained.

关键词：有 muiti 的 schiff >6 号元素碳的化学符号 = N—组稀土元素建筑群 AM1 方法催化活

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