某些Cr(Ⅲ)配合物的冷冻溶液或稀释粉末ESR谱研究

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

某些Cr(Ⅲ)配合物的冷冻溶液或稀释粉末ESR谱研究

白令君

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

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/Abstract

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. 1，2，3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)₃］^3- (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

中图分类号:

O482.53⁺³

白令君. 某些Cr(Ⅲ)配合物的冷冻溶液或稀释粉末ESR谱研究[J]. 波谱学杂志, 2001, 18(3): 215-221.

BAI Ling-jun. ESR STUDIES OF Cr(Ⅲ) COMPLEXES IN FROZEN SOLUTION AND DILUTED POWDER[J]. Chinese Journal of Magnetic Resonance, 2001, 18(3): 215-221.