Coordination chemistry of supramolecular rhodanine azodye sulphadrugs

This review gives an account of the coordination chemistry of rhodanine azo sulphadrugs ligands with two (bidentate) or four (tetradentate) potential donor atoms. The syntheses and structures of the ligands complexes are described according to the donor atom combinations and metals involved. The characterization of novel formed complexes was done by various physico-chemical and spectral techniques. The coordination geometries and electronic structures are determined from a framework for modeling of novel rhodanine azosulphadrug complexes. The values of υ3 of the prepared complexes containing UO22+ were successfully used to calculated the force constant, FUO (10−8 N/Å) and the bond length RUO (Å) bond. Wilson’s, matrix method, Badger‘s formula, and Jones and El-Sonbati equations were used to calculate the U–O bond distances from the values of the stretching and interaction force constants. The most probable correlations between U–O force constant to U–O bond distance were satisfactorily discussed in terms of “Badge‘s rule”, “Jones” and “El-Sonbati equations” in case of uranyl complexes. The review also covers The Proton-ligand dissociation constants of the rhodanine azodye sulphadrugs and metal-ligand stability constants of their complexes with some transition metal ions have been determined potentiometrically.