Characterization of Tm (III) -sulphonananilide systems in terms of thermodynamic and electronic-spectral parameters

Abstract

The complexes of d-block transition metals with various ligands have been studied extensively. However, in case of f-block lanthanide metal complexes,      a limited study has so far been carried out. Systematic study of lanthanide complexes began only after the publication of Judd-Ofelt theory in 1962. Several lanthanide complexes were prepared with the ligands possessing “O” and “N” as donar atoms and examined for various electronic-spectral parameters resulting from f-f transitions.

In the present work, electronic-spectral characterization of various Tm(III) systems in DMF medium involving sulphonanilide ligands having “O”, “N” and “S” donar atoms will be examined on  the basis of theories given by Lande, Carnall & Judd-Ofelt

The complexing ability has been reported poor in case of lanthanide complexes and also the stability of lanthanide complexes is found similar to [Ag(NH₃)₂]⁺ type of complex, which makes the isolation of these complexes in solid state difficult. Owing to the poor thermodynamic stability of lanthanide complexes, a modified doped model  technique will be taken as system in the present electronic-spectral study.