波谱学杂志 ›› 2001, Vol. 18 ›› Issue (3): 215-221.

• 研究论文 • 上一篇    下一篇

某些Cr(Ⅲ)配合物的冷冻溶液或稀释粉末ESR谱研究

白令君   

  1. 南开大学化学系,天津 300071
  • 收稿日期:2001-06-05 修回日期:2001-06-25 出版日期:2001-09-05 发布日期:2001-09-05
  • 作者简介:白令君(1941-),女,教授.

ESR STUDIES OF Cr(Ⅲ) COMPLEXES IN FROZEN SOLUTION AND DILUTED POWDER

BAI Ling-jun   

  1. Department of Chemistry, Nankai University, Tanjin 300071
  • Received:2001-06-05 Revised:2001-06-25 Online:2001-09-05 Published:2001-09-05

摘要:

报道了三个Cr(Ⅲ)螯合物负离子——[Cr(ox)3]3- (1), [Cr(bipy)(ox)2- (2), [Cr(phen)(ox)2- (3)(ox为草酸根二价负离子,bipy为2,2′-联吡啶,phen为1,10-邻菲罗啉)在冷冻水溶液中,以及一个粉末样品—稀释在硫酸铝铵中硫酸铬铵(mol比Cr3+∶Al3+=1∶150 )(4)于室温下的ESR谱,得到配合物的波谱参数值,并对分子的对称性进行了分析. 123有相同的g值(1.99),相近的D值(0.42~0.45cm-1),但相差 很大的E值(分别为0.015, 0.05, 0.11cm-1),这些值反映了溶液中过渡金 属离子内在对称性的变化.

关键词: Cr(Ⅲ)配合物, 稀释粉末或冷冻溶液ESR谱, 零场分裂参数D, E

Abstract:

Electron spin  rosanence spectra are reported for low-temperature glassy  solution of Cr(Ⅲ)complexes [Cr(ox)33- (1), [Cr(bipy)(ox )2- (2), [Cr(phen)(ox)2- (3) (ox=oxalate dianion, bipy=2,2′-bipyridine, phen=1,10-phenanthroline) and  powder of (NH4)Cr(SO4)2 diluted in (NH4)Al(SO4)2  (Cr3+∶Al3+ mol ratio of 1∶150)(4). Spin-Hamiltonian parameters a re determined. Complexes 1, 2 and 3 have approximately the same g(1.99) and zero-field splitting parameters D values (0.42 ~0.45cm-1), but the E values are different. For Cr(Ⅲ) complexes 1, 2, 3, E=0.015, 0.05, 0.11cm-1, respectively. These values should reflect changes of the intrinsic symmetry of transition metal ions in solution.

Key words: Cr(Ⅲ)complexes, ESR, Zero-field splitting paramet ers D, E

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