EPR and optical study of Mn2+-doped bis(l-Asparaginato)Zn(II)

EPR and optical studies of single crystals of Mn2+: bis(l-Asparaginato)Zn(II) are reported. The spin-Hamiltonian parameters are determined employing the positions of a large number of resonance lines for various orientations of the external magnetic field. The best-fit zero-field parameters to the observed EPR spectra are obtained as, D=(228±2)×10−4 cm−1, E=(58±2)×10−4 cm−1 and a=(−12±1)×10−4 cm−1,whereas g=2.0002±0.0002, A=(74±2)×10-4cm-1, and B=(62±2)×10-4cm-1. From the optical absorption study, the lattice distortion is suggested. The electron repulsion parameters (B and C) and crystal field parameters (Dq and α) evaluated from the fitting of observed optical spectra are: B=858 cm−1, C=2620 cm−1, Dq=950 cm−1, and α=76 cm−1.