Absorption spectral study of mixed ligand complexes of some biochemically important poly amine polycarboxylic acids with Nd(III) and Pr(III)

摘要

Absorption spectroscopy has been used as a tool to understand the coordination of a mixed ligand complexes of neodymium (III) and praseodymium (III) with the polyamino carboxylic acids,viz.,nitrilotriacetic acid, 10-(2-hydroxypropyl)-1,4,7-10 tetraazacyclo dodacane 1,4,7-triacetic acid,ethylene diamine-N,N,N',N'-tetraacetic acid, cyclohexylene diamine tetraacetic acid,and diethylene triamine-N,N,N',N'-pentaacetic acid (NTA,HEDTA,EDTA,CDTA and DTPA) in presence of acetyl acetone in aquo-organic medium (DMF/H2O).The spectral characteristics like oscillator strengths,T_(lambda) and Judd-Ofelt intensity parameters of the 4f-4f transitions have been evaluated in order to investigate the formation and the type of bonding in lanthanide-ligand complexes in DMF.The values have been computed for energy interaction Slater Condon (F_k'),nephelauxetic effect (beta),bonding (b~(1/2)) and %covalency (delta) parameters.