Potentiometric and spectroscopic studies of some new rhodanine derivatives and its Ag [I], Hg [II] and Cu [II] complexes

A new series of benzylidenerhodanine derivatives and their complexes with Ag [I], Hg [II] and Cu [II] ions have been prepared. The reagents and its complexes were characterized by elemental and thermal analyses, IR and electronic absorption spectra. Probable modes of chelation with these new reagents are discussed. The protonation constants of rhodanine derivatives and the conditional stability constants of the formed complexes were determined for 1: 1 molar ratio in 50% [v/v] ethanol-water medium at 25C [NaClO4]. X-ray diffraction patterns for pure complexes were recovered to throw more light on their structure