EPR and optical absorption studies of copper ions in diglycine calcium chloride tetrahydrate

EPR study of copper ions in diglycine calcium chloride tetrahydrate (DGCCT), [(NH2CH2COOH)2·CaCl2·4H2O] single crystals at room temperature is carried out. The spin Hamiltonian parameters of copper ions are determined as: gx = 2.0238 ± 0.0002, gy = 2.1122 ± 0.0002, gz = 2.2250 ± 0.0002, Ax = (83 ± 2) × 10−4 cm−1, Ay = (86 ± 2) × 10−4 cm−1 and Az = (118 ± 2) × 10−4 cm−1. The optical study of the single crystals at room temperature is also done and the bands are assigned to d-d and charge transfer transitions. Using above data, the nature of bonding in the complex is discussed.