Chinese Journal of Magnetic Resonance

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NMR STUDIES OF COMPLEXES [Co(TREN)(AMINO ACIDATO-N, O)]X2·nH2O IN S OLUTION

SHAO Wei-yan, ZHONG Shi-zhou, HU Xiao-peng, CAI Ji-wen   

  1. Instrumentation Analysis & Research Center, Zhongshan University, Guangzhou  510275, China
  • Received:2001-10-10 Revised:2001-12-07 Published:2002-06-05 Online:2002-06-05
  • Supported by:

    国家自然科学基金资助项目(29801006).

Abstract:

NMR experiments at various temperature or with different solvents were  used to characterize the nature of hydrogen bonds and conformation of several c omplexes in solution, namely the trans(N, t-N) isomer of [Co(tren)(DL-phen ylalaninato)](ClO4)2(Ⅰ), Co(tren)(L-pro-linato)]I2·H2O(Ⅱ), [Co(tren)(L-valinato)]I2·1/3H2O(Ⅲ), Co(tren)(L-isoleucinato)]I2(Ⅳ), [Co(tren)(L-leucinato)]I2(Ⅴ). Compared with their crystal structures in  whi ch inte rmolecular double or single hydrogen bonds were observed. Intramolecular double  or single hydrogen bonds formed by the carbonyl oxygen of the amino acidato li gand and the amino hydrogen of the tren ligand were observed in Ⅲ, Ⅳ, Ⅴ. Whil e the situations in Ⅰand Ⅱ need more investigations. The 1H and 13C NMR assignments were achieved by 2D NMR(COSY and HMQC ).

Key words: Co(Ⅲ) complexes, amino acid ligand, tren, hydrogen bond, NMR

CLC Number: