ESR g -ANISOTROPY INVERSION OBSERVED FOR Cu(II)-CROWN ETHER COMPLEX IN SOLUTION
1978; Oxford University Press; Volume: 7; Issue: 6 Linguagem: Inglês
10.1246/cl.1978.579
ISSN1348-0715
AutoresKazuhiko Ishizu, Tokuhiro Haruta, Kazuhiro Nakai, Kiyonori Miyoshi, Yukio Sugiura,
Tópico(s)Free Radicals and Antioxidants
ResumoAbstract CuCl2 solubilized by Benzo-15-crown-5 in dry CHCl3 showed the anomalous g-anisotropy inversion (g|| <g⊥) in the ESR spectrum. The spin Hamiltonian parameters determined were g||=1.995, g⊥=2.294 and |A|||=129.8×10−4 cm−1. Based on the ESR parameters, the bonding parameters of Cu(II) were calculated with application of the Swalen’s method. A weak bonding in the xy-plane of the paramagnetic site was assumed between the metal and the ligands, and a perturbation on the Cu(II) positive hole appears mainly due to the crystal field working along the z-axis, and the unpaired electron was suggested to occupy the dz2 orbital at the ground state.
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