Electron spin resonance study of copper(II) ions in powder and crystals of aquatris(L-glutamato)cadmium(II) monohydrate

Abstract

A single-crystal e.s.r. study has been carried out on copper(II) ions doped into aquatris(L-glutamato)cadmium monohydrate. The copper(II) site in this lattice was found to have approximate monoclinic symmetry with g_z= 2.3545, g_y= 2.0920, g_x= 2.0678, A_Z= 0.0135, A_y= 0.0020, A_X= 0.0027, A_Z^N= 0.0012, A_y^N= 0.0009, and A_X^N= 0.0006 cm^–1. The extent of non-coincidence of g and A principal directions was ca. 5° in the xy plane. It was concluded that a small admixture of |3z²–r²〉 into the ground state formed by a linear combination of |x²–y²〉 and |xy〉 could account for the experimentally determined anisotropy. The e.s.r. data taken at low temperatures have been related to molecular bond directions furnished by previously published room temperature X-ray data.