Synthesis And Structural Studies On Polynuclear Metal Complexes Derived From A New Multidentate Ligand

This study presents the synthesis and characterization of a new multidentate ligand H6-DHADBrnand its metal complexes. The ligand, H6-DHADB is a hydrated Schiff base product formed byrnthe condensation of2, 4- Dihydroxy-5-acetyl acetophenone (H,-DAA) and 1,3- diamino propanernin 3:2 mole ratio. It possesses four independent chelating sites (00, ONNO, ONNO, 00)rnseparated by bulky phenyl groups. The metal complexes of H6-DHADB with Co(II), Ni(ll),rnCu(ll), Zn(ll), Cd(Il) and Hg(lI) have been synthesized from methanolic media at pH ~8. Theyrnhave been characterized on the basis of elemental analysis, thermal, conductance, IR andrnelectronic spectral studies. The studies have shown that all the metal complexes are nonelectrolytesrnwith metal to ligand ratios in 3: 1,2: 1 and 2: I in Co(ll), Ni(Il) and Cu(ll) complexesrnrespectively and 4: I, 2: I, 1: 1 in Zn(ll), Cd(Il) and Hg(ll) complexes respectively. Based onrnIR spectral data, a variety of donor propel1ies of the ligand has been proposed. ONNO, ONNOrnand 00 chelation with cobalt(II); 00 and 00 chelation with nickel(II); ONNO and ONNOrnchelation with copper(II); 00, ONNO and 00 chelation with zinc (II) and 00 chelation withrnCd(ll) and Hg(lI) have been suggested.rnBased on electronic spectral data cobalt(ll) complex exhibited octahedral, copper(Il) complexrnshows square planar structure and nickel(ll), zinc(Il), cadmuim(ll) and mercury(ll) complexesrnattain tetrahedral geometries.

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