Spectral and physico-chemical investigations of novel homo-dinuclear di-μ2-alkoxo bridged Schiff base complexes: 57Fe Mössbauer parameters of the Fe(III) complex
作者:Zafar A. Siddiqi、Mohd Khalid、Sarvendra Kumar、M. Shahid、Shabana Noor
DOI:10.1016/j.saa.2009.12.010
日期:2010.2
Spectral and molecular model computations on homo-dinuclear complexes [M2L2(H2O)(2)Cl-2] [L = 1-(salicylaldeneamino)-3-hydroxypropane, M = Cr3+, Mn3+, Fe3+, Co3+, Ni3+ or Cu3+] are consistent with a distorted hexa-coordinate geometry. X-band EPR spectral data indicated a rhombic distortion around Cu(II) ion. Magnetic moment and Fe-57 Mossbauer data confirmed a high-spin state electronic configuration (t(2g) (3)e(g)(2), S = 5/2) and asymmetric ligand environment around Fe(III) with nuclear transitions Fe(+/-3/2 -> 1/2) exhibiting Kramer's double degeneracy. The neighboring Fe(III) nuclei in the homo-dinuclear species are antiferrornagnetically coupled. (C) 2009 Elsevier B.V. All rights reserved.