SYNTHESIS AND CHARACTERIZATION OF SOME NOVEL HEXA-COORDINATED MIXED-LIGAND COMPLEXES OF LANTHANIDES WITH 4-(3,5-DIPHENYL-2-PYRAZOLIN-1-YL) BENZENESULPHONIC ACID

Novel mixed-ligand 1,10-phenanthroline complexes of some lanthanides o f the formula [M(phen)(2)(DPBS)(2)] . DPBS, where phen = 1,10-phenanth roline, DPBS = 4-(3,5-diphenyl-2-pyrazolin- l-yl)benzene sulphonate io n and M = lanthanide and yttrium have been synthesized by the interact ion of M(phen)(2)(ClO4)(3) with HDPBS in methanol. These complexes hav e been characterized by elemental analyses, molar conductances, magnet ic measurements, thermogravimetric analyses, XPS, IR and UV-vis spectr al studies. An octahedral structure has been proposed for all the comp lexes, where phen is trans to phen in the equatorial position and two DPBS ligands are trans to each other at the axial positions.