Ternary Lanthanide Complexes of the Type M(Hsal)3(TPX → O)2 and a Fluorescence Spectral Study of the Eu(III) Analogue

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Abstract
Ternary lanthanide complexes of the general formula M(Hsal)3 (TPX→O)2 , where M = lanthanide (III) ion, Hsal=salicylate ion =C6H4(OH)COO- and X = P or As have been isolated as solids from the benzene phase during liquid-liquid extraction studies of M(Hsal)3 complexes with benzene solutions of TPX→O. The coordinated nature of the TPX→O ligands has been established from the observed shifts of the X → O frequency in the infrared. A lowering of the 1190 cm-1 P → O frequency where X = P , and an increase in the 885 cm-1 As → O frequency where X = As have been observed for the ternary complexes. The infrared spectra of the ternary complexes in general indicate the coordinated nature of the salicylate ions. The luminescence spectra of Eu(Hsal)3 (TPPO)2 and Eu(Hsal)3 (TPAsO)2 complexes have also been investigated at 77 °K. Beside the emission of the characteristic red europium fluorescence due to the excitation of the complexes with near UV light, emission of a blue molecular phosphorescence from the complexes has also been observed. The fluorescence intensities of the f → f transitions are, however, weak. This point has been discussed.

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