Single crystal EPR studies on Mn(II)-doped sarcosine cadmium chloride and sarcosine cadmium bromide: study of zero-field splitting tensor in iso-structural complexes.
EPR spectra of single crystals of Mn(II)-doped sarcosine cadmium chloride and sarcosine cadmium bromide are studied in Q-band and in X-band at room temperature. Two magnetically inequivalent sites are observed in both the lattices in a distorted octahedral environment. The spin-Hamiltonian parameters are extracted and are found to have a rhombic symmetry. The angular variation of the zero-field transitions is simulated for one of the sites with an asymmetric zero-field tensor D = 480 x 10(-4) cm(-1), E = -115 x 10(-4) cm(-1) and a = 10 x 10(-4) cm(-1) for Mn(II) in sarcosine cadmium chloride and with D = 460 x 10(-4) cm(-1) E = -98 x 10(-4) cm(-1) and a = 10 x 10(-4) cm(-1) for Mn(II) in sarcosine cadmium bromide. The observed large value of zero-field tensor is due to the steric effects of the crystal packing caused by the ligands. Matumura's plot predicts an average covalency of 8.8 and 7.7% for the manganese-ligand bond in SCC and SCB lattices respectively.
Pathinettam
Padiyan D
PD
Department of Physics, Manonmaniam Sundaranar University, Tirunelveli, India. bio@md3.vsnl.net.in
Muthukrishnan
C
C
Murugesan
R
R
D001965:Bromides / Q000737:chemistry*; D002104:Cadmium / Q000737:chemistry*; D019256:Cadmium Chloride / Q000737:chemistry*; D004578:Electron Spin Resonance Spectroscopy / Q000379:methods*; D008024:Ligands; D008280:Magnetics; D008345:Manganese / Q000737:chemistry*; D010100:Oxygen / Q000378:metabolism; D012521:Sarcosine / Q000737:chemistry*; D013696:Temperature
D001965:Bromides; D008024:Ligands; D002104:Cadmium; D008345:Manganese; D019256:Cadmium Chloride; D010100:Oxygen; D012521:Sarcosine