Synthesis And Characterization Of Quaternary Complexes Of Rare Earth Perchlorita With Diphenyl Sulfoxide, Benzoic Acid And Studies On Fluorescence Of Complexes

Eleven solid quaternary complexes of rare earth perchlorate with diphenyl sulfoxide (L) and benzoic acid (L') have been synthesized and characterized. By elemental analysis, coordination titration and TGA-DTA studies, the composition of the complexes were suggested as [REL₅L'(ClO₄)](ClO₄) ( RE = La,Pr,Nd,Sm,Eu,Tb,Dy,Ho,Er,Tm,Yb; L=C₆H₅SOC₆H₅, L'=C₆H₅COO^-). IR spectra, ¹HNMR studies indicated that diphenyl sulfoxide(L) bonded with RE³⁺ ions by the oxygen atom in sulfinyl group while benzoic acid(L') bonded with RE³⁺ ions by one oxygen atom in carbonyl group which coordinate as a unidentate group. The molar conductivities in acetone solution indicated that two anions are coordinated with RE³⁺,¹HNMR studies indicated that benzoic acid(L') bonded with RE³⁺ by anion C₆H₅COO^-; one of two perchlorates (ClO₄^-) is coordinated with RE³⁺ while another is not. Coordination number of quaternary complexes is 7. Fluorescent spectra of Eu³⁺, Sm³⁺, Tb³⁺and Dy³⁺complexes showed that quaternary complexes have...