Abstract
Several mononuclear complexes of bivalent metal ions with two new ligands i.e. 1(2-hydroxyphenyl)-3(4-fluorophenyl)1,3-propadione (hfp) Ia and 1(2-hydroxyphenyl)-3(4-chlorophenyl)1,3-propadione (hcp) Ib, are synthesized from methanolic solution. These complexes have [ML(2)].nH(2)O stoichiometry (M = VO2+. Co2+, Ni2+, CU2+,d UO22+ and n = 0 - 3.5). The magnetic moments of these complexes (except [UO(2)L(2)].nH(2)O which are diamagnetic) are between 1.93 - 4.91 BM which are typical of mononuclear species. The infrared and electronic spec(ra of these complexes are utilized lo ascertain metal ligand binding sites. These com,plexes are assigned an octahedral structure (II and IIb) except [UO(2)L(2).nH(2)O complexes (IIIa and IIIb) which are seven coordinated with pentagonal bipyramidal environment.