Chinese Journal of Magnetic Resonance

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1H NMR STUDIES ON THE LANTHANIDE COMPLEXES OF TRIPODAL LIGAND

YANG Xiao-ping, KUANG Dai-bin, ZHENG Kang-cheng, SU Cheng-yong and LIU Han-qin*   

  1. Institute of Physical Chemistry, School of Chemistry and Chemical Engine ering, Zhongshan University, Guangzhou 510275
  • Received:2000-11-13 Revised:2000-12-01 Published:2001-03-05 Online:2001-03-05
  • About author:*Correspondence author
  • Supported by:
    国家自然科学基金,北京大学国家稀土重点实验室开放基金资助项目.

Abstract:

The preparation of binary and ternary solid complexes of lanthanide ions with tripodal ligand N,N-bis(2-benzimidazolylmethyl)-N-(2-pyridylmethyl)amine
(L) and antipyrine (L′) is reported in this article. The coordination forms of the complexes in various solutions were studied by 1H NMR, supported by the si
ngle crystal x-ray diffraction and IR data, as well as the ab initio calculation. In CH3CN solution, L coordinates to the metal atoms with four nitrogen atoms, while L′ with its carbonyl oxygen only. The coordination numbers of the binary and ternary complexes were 10 and 7 respectively. In the ternary complexes,
anions and solvent molecules could not enter the coordination sphere due to the steric effect of three big L′molecules. The complexes dissociate in the strongly polar DMSO solution.

Key words: Lanthanide complex, Tripodal ligand, Antipyrine, 1H NMR, Coordinate form

CLC Number: