The optical absorption properties of 5-(4′-derivatives phenylazo)-2-thioxothiazolidin-4-one (HL n ) (where X = H) thin films have been studied. It was found that the values of the energy band gap, E g, for derivatives were in the range of 1.77–2.29 eV depending on the nature of the substituent. The optical values of the energy band gap (E g) for all derivatives near the absorption edge were found to be direct allowed transition. The synthesized ligands (HL n ) (where X = H) were screened as antibacterial and antifungal agents. The proton–ligand dissociation constant of the rhodanine azo derivatives (HL n ) (where X = H and X = P-OCH3Ph) and metal–ligand stability constants of their complexes with metal ions (Mn2+, Co2+, Ni2+, Cu2+ and Zn2+) have been determined potentiometrically in 0.1 M KCl. The stoichiometries of copper(II) and cadmium(II) complexes of HL n (where X = Ph) were determined conductometrically and indicated the formation of 1:1 and 1:2 (metal:ligand) complexes. The molar ratio of ligand (HL n ) (where X = H) and Ru(III) complexes is (1:2)/(1:3)(M:L n ), respectively. The study revealed octahedral geometry around Ru(III) complexes. A series of heterocyclic mixed ligands of oxovanadium(IV) complexes have been synthesized by the reaction of vanadium(IV) sulfate with rhodanine azo (HL n ) (where X = H) in the presence of β-diketone (LH). Palladium(II) complexes of the general formula [Pd(L n )L] (where LH = diketone = acetylacetone, HL n = azorhodanine) have been synthesized. In these complexes, the azo ligand acts as a monobasic bidentate ligand and is coordinated to the metal ion through the azo-nitrogen, enolic oxygen atoms forming stable six-membered heterocyclic rings. The D.C. electrical conductivity of HL n (where X = Ph) and their complexes were measured. The bond lengths and the force constants have been calculated for uranyl complexes (26–30) of HL n (where X = Ph). The plotting of r 1, r 2 and r 3 (bond distance, r U–O) versus ν 3 give a straight line with increasing the value of ν 3 and decreasing r U–O.
Research on Chemical Intermediates – Springer Journals
Published: Feb 17, 2015
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