EPR and Optical-Absorption Studies of Cu2+-Doped Zn(NH2(CH2)3NHOH)2Ni Single Crystals

Abstract

Electron paramagnetic resonance of Cu2+-doped catena-trans-bis(N-(2-hydroxyethyl)-ethyl-enediamine) zinc(II)-tetra-μ- cyanonicelate(II) [Zn(NH<inf>2</inf>(CH<inf>2</inf>)<inf>3</inf>NHOH) <inf>2</inf>Ni(CN)<inf>4</inf>] single crystals and powder are examined at room temperature. The spectra show the substitution of the Zn2+ ion with the Cu2+ ion. The crystal field around the Cu2+ ion is nearly axial. There is a single paramagnetic site with g<inf>xx</inf> = 2.073, g<inf>yy</inf> = 2.060, g<inf>zz</inf> = 2.248, A<inf>xx</inf> = 40.5 G, A <inf>yy</inf> = 50.8 G, A<inf>zz</inf> = 172.0 G. The ground-state wave function is an admixture of d<inf>x2-y2</inf> and d<inf>z2</inf> states. The optical-absorption studies show two bands at 320 nm (31250 cm-1) and 614 nm (16286 cm-1), which confirm the axial symmetry. The crystal field parameters and the wave function are determined. © Springer-Verlag 2006.