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 of the formula [M(phen)(2)(DPBS)(2)] . DPBS, where phen = 1,10-phenanthroline, DPBS = 4-(3,5-diphenyl-2-pyrazolin- l-yl)benzene sulphonate ion and M = lanthanide and yttrium have been synthesized by the interaction of M(phen)(2)(ClO4)(3) with HDPBS in methanol. These complexes have been characterized by elemental analyses, molar conductances, magnetic measurements, thermogravimetric analyses, XPS, IR and UV-vis spectral studies. An octahedral structure has been proposed for all the complexes, where phen is trans to phen in the equatorial position and two DPBS ligands are trans to each other at the axial positions.