Acta Phys. -Chim. Sin. ›› 2003, Vol. 19 ›› Issue (04): 320-325.doi: 10.3866/PKU.WHXB20030408

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Study on Spectra Properties of Chiral Dinuclear Salen Complex

Hu Guo-Hang;Ruan Wen-Juan;Zhang Yu-Ling;Han Hua;Zhu Zhi-Ang   

  1. Department of chemistry, Nankai University, Tianjin 300071
  • Received:2002-07-15 Revised:2002-10-28 Published:2003-04-15
  • Contact: Ruan Wen-Juan E-mail:wjruan@nankai.edu.cn

Abstract: Four novel chiral dinuclear Salen complexes [(Cu)2L•H2O(2), (Ni)2L(3), (Zn)2L•H2O(4), (MnCl)2L•2H2O(5)] have been synthesized (L is chiral dimeric Salen ligand which is synthesized from (R, R)-diaminocyclohexane, 3,5-di-tert-butyl salicylaldehyde, 5,5′-methylene-di-salicylaldehyde). These ligands and complexes were characterized by elemental analysis, 1H NMR, UV-Vis, FT-IR, CD spectra. The UV-Vis spectra were compared with those of monomeric Salen ligand and complex. It was found that the position and shape of absorption band are similar to those of the corresponding monomeric compounds, but the values of the absorption peak(ε) are approximately two folds larger. Furthermore Cotton effect and Cotton split of CD spectra of these chiral compounds were explained by the exciton interaction theory. It seemed that the direction of Cotton split depend on the configuration of diaminocyclohexane. (R, R)-diaminocyclohexane termined the chirality of Salen compounds as negative, and the positive and negative component of Cotton split lie at higher and lower energy respectively.

Key words: Chiral Salen(N,N′-bis-(salicylaldehyde) ethylenediimine)] ligands,  Dinuclear Salen complexes, Spectra properties