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