The metal complexes of heterocyclic (β-diketones and their derivatives—II : Lanthanide chelates of 1-phenyl-3-methyl-4-acetylpyrazolone-5, (HPMAP)

Abstract

Some lanthanide chelates of l-phenyl-3-methyl-4-acetyl-pyrazolone-5, HPMAP, have been synthesized and investigated. Characterisation involved elemental analysis, conductivity measurements, IR and proton magnetic resonance spectra, melting points and Karl-Fischer titrations. The complexes are shown to be neutral chelates with the empirical formula Ln(PMAP) 3·xH 2O·yC 2H 5OH were for Ln = La, Ce and Nd, x = 2 and y = 1, and for Ln = Y, Eu, Gd, Dy, Er and Lu, x = 2 and y = 0. IR, PMR and electronic spectral data together with band assignments are presented. The Nd chelate was found to exhibit positive nephelauxetic effect and Sinha's parameters were calculated and discussed for Nd and Er.