METAL-COMPLEXES OF SOME PHENOLIC 1,3-DIKETONES .2. MONONUCLEAR COMPLEXES OF SOME BIVALENT-METAL IONS WITH 1(2-HYDROXYPHENYL)-3(4-HALOPHENYL)-1,3-PROPADIONES

Several mononuclear complexes of bivalent metal ions with two new liga nds i.e. 1(2-hydroxyphenyl)-3(4-fluorophenyl)1,3-propadione (hfp) Ia a nd 1(2-hydroxyphenyl)-3(4-chlorophenyl)1,3-propadione (hcp) Ib, are sy nthesized 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 whi ch are diamagnetic) are between 1.93 - 4.91 BM which are typical of mo nonuclear species. The infrared and electronic spec(ra of these comple xes are utilized lo ascertain metal ligand binding sites. These com,pl exes 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 p entagonal bipyramidal environment.