Temperature dependence of X- and Q-band EPR spectra of the dinuclear manganese(II) complex [(NO2Bpmp)Mn2(μ-OAc)2]+:: Determination of the exchange constant and of the spin parameters for the S = 1, 2, and 3 spin states

被引:33
作者
Blanchard, S
Blain, G
Rivière, E
Nierlich, M
Blondin, G
机构
[1] Univ Paris 11, Inst Chim Mol & Mat Orsay, Chim Inorgan Lab, LRC,CEA,UMR 8613, F-91405 Orsay, France
[2] CEA Saclay, DRECAM, SCM, F-91191 Gif Sur Yvette, France
关键词
EPR spectroscopy; exhange interactions; manganese; N; O ligands;
D O I
10.1002/chem.200304759
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
A new dinuclear manganese(ii) complex was synthesised with the biscompartimental ligand 2,6-bis[bis(2-pyridylmethyl)aminomethyl]-4-nitrophenol (NO(2)BpmpH) and characterised by X-ray crystallography. Magnetic susceptibility measurements revealed that the two high-spin Mn-II ions are antiferromagnetically coupled with a singlet-to-triplet separation of 7.2 cm(-1). The powder EPR spectra were recorded for both X- and Q-bands between 1.8 K and 35 K. A detailed analysis of these spectra led to the determination of three out of five individual spin-state zero-field splitting parameters.. From the proposed simulations, the exchange coupling constant J and the intermetallic distance have been computed.
引用
收藏
页码:4260 / 4268
页数:9
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