The Optical Absorption and Electron Paramagnetic Resonance of Cu2+ Incorporated Dicalcium Lead Propionate

Following gamma-ray exposure, a room-temperature study of electron paramagnetic resonance (EPR) is conducted on Cu2+-doped dicalcium lead propionate (DCLP), Ca2Pb(C2H5COO)(6). Cu2+ is found at four magnetically equivalent sites replacing Ca2+. EPR spectra are fitted to a rhombic symmetry Hamiltonian in order to determine the spin Hamiltonian parameters. The determined parameters are gx = 2.0245 +/- 0.0002, gy = 2.1024 +/- 0.0002, gz = 2.3476 +/- 0.0002, Ax = (56 +/- 2) x 10(-4) cm(-1), Ay = (78 +/- 2) x 10(-4 )cm(-1), and Az = (98 +/- 2) x 10(-4) cm(-1). The experimental value of g-anisotropy is compared with the evaluated one. The wavefunction for the ground state is determined to be 0.999|x2 - y2> - 0.004|3z2 - r2>. The complex's bonding nature is determined with the aid of an optical study. The optical transitions d(x2-y2) -> d(xy)(B-2(1g) -> B-2(2g)), d(x2-y2) -> d(xz,yz)(B-2(1g) -> E-2(g)), and d(x2-y2) -> d(3z2-r2)(B-2(1g) ->(2)A(1g)) are observed at 12,121, 18,691, and 25,316 cm-1, respectively. The molecular orbital coefficients alpha(2)(0), beta(2)(1), beta(2)(0), and beta(' 2) and Fermi contact term K for Cu2+-doped DCLP are found as 0.63, 1.00, 1.00, 0.40, and 0.44, respectively.