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[Co(tren)(amino acidato-N, O)]X2·nH2O在溶液中的NMR研究

邵伟艳,钟世舟,胡小鹏,蔡继文   

  1. 中山大学测试中心,广东广州 510275
  • 收稿日期:2001-10-10 修回日期:2001-12-07 出版日期:2002-06-05 发布日期:2002-06-05
  • 作者简介:邵伟艳(1973-),女,山东青岛人,硕士,中山大学助理研究员. 
  • 基金资助:

    国家自然科学基金资助项目(29801006).

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 Online:2002-06-05 Published:2002-06-05
  • Supported by:

    国家自然科学基金资助项目(29801006).

摘要:

报道了配合物[Co(tren)(DL-phenylalaninato)](ClO4)2 (Ⅰ)、Co(tren)(L-prolinato)]I2·H2O (Ⅱ)、[Co(tren) (L-valinato)]I2·1/3H2O (Ⅲ)、[Co(tren)(L-isoleucinato)]I2 (Ⅳ)、[Co(tren) ( L-leucinato)]I2 (Ⅴ) 在溶液中的NMR研究. 通过同核和异核二 维核磁共振实验归属了配合物的1H和13C NMR ,发现在配合物的空间结构 中,四齿配体(tren)的3个螯合臂中有两个构象稳定,而另一个构象不稳定,这与晶体学数据吻合. 通过变温实验和溶剂效应实验,发现在配合物Ⅲ、Ⅳ、Ⅴ中存在分子内氢键,而在晶体结构中,所有配合物都存在分子间氢键. 配合物Ⅰ、Ⅱ在溶液中的行为需进一步的研究 .

关键词: Co(Ⅲ)配合物, 氨基酸配体, 四齿配体, 氢键, NMR

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

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