ESR of copper-doped sodium citrate

Abstract

Single crystal ESR spectra of Cu 2 + ion doped in sodium citrate are reported at room temperature. The observed spectra are fitted to a spin-Hamiltonian of rhombic symmetry with g x = 2.1076 ± 0.002 , g y = 2.1289 ± 0.002 , g z = 2.4454 ± 0.002 , A x = ( 40 ± 2 ) 10 - 4 cm - 1 , A y = ( 62 ± 2 ) 10 - 4 cm - 1 and A z = ( 78 ± 2 ) 10 - 4 cm - 1 . It is found that Cu 2 + enters the lattice as a substitutional impurity replacing an Na + ion. The ground state wave function of Cu 2 + ion in this lattice is also determined from the spin-Hamiltonian constants obtained from ESR results. It is found that the ground state is predominantly | x 2 - y 2 〉 . With the help of the optical absorption study, the nature of bonding in the complex has also been discussed.