- 作者: 王松茂; 陳榮作
- 作者服務機構: Department of Chemistry, National Tsing Hua University
- 中文摘要: Isotropic nuclear magnetic resonance shifts have been measured for imidazole (Im), 2-methyl imidazole (2MeIm) and N-methyl imidazole (NMeIm) adducts with Cu(AA)2, Cu(TFA)2 and Cu(HEA)2, where AA, TFA and HFA are anion of acetylacetone, trifluoroacetylacetone and hexafluoroacetylacetone, respectively, in deuteriochloroform solution. The pseudocontact contribution to the isotropic shifts are negligibly small and Ferrmi contact interaction is dominant in these copper complexes. the normal temperature effect and appreciable apin delocalization suggest that the imidazole and substituted imidazole adducts with Cu(chelate)2 are all six-coordinated octahedral complexes, and consistent with our results of spectrophotometric study. In these imidazole complexes, the magnitude of the contact shifts lie in the order Cu(HFA)2>Cu(TFA)2>Cu(AA)2, which is the same as that of the stability constants for the pyridine type adduct formation found from spectrophotometric studies. For a given Cu(chelate)2, the basicity of ligand for adduct formation is in the order NMeIm>Im>2MeIm.
- 英文摘要: --
- 中文關鍵字: --
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