Photo degradation of Lanthanum (III) Complex with 1, 2 , 4-Thiadiazole in Dimethyl Sulsoxide ( DMSO ) Solvent

Abstract

5- Amino -3- [4- O- hydroxypheny Ithiosemi carbazido ] -1,2,4-thiadiazole compound has been prepared by the reaction of ( 3-mercapto -5- ami,2,4- thiadiazole) with ( O-hydroxyphenyl thiosemicarbazide) in mole ratios of (1:1) .The ligand has been  characterized and its structure was elucidated depending upon the spectral data of  IR and U.V-Vis spectra . Lanthanum complex of the formula  [La( C₉H₁₀N₆S₂O)₂Cl₂]Cl was prepared through the reaction of the prepared ligand with lanthanum chloride in mole ratios (2:1) respectively . The mode of bonding and overall geometry of the complex was determined through physicochemical and spectroscopic methods . The kinetic of the photo-degradation of the prepared complex was investigated and it was the first order and the rate constant (Kd) determined at (25^oC ) Further more primary  quantum yields (Φ) has been also calculated.