Structural and Spectroscopic Study of Novel Tetradentate Macrocyclic Ligand Type N4 and It’s Complexes with CrIII, MnII, FeII, CoII, NiII ,CuII, PdII and CdII

Ethy lenediamine was reacted in the first step with 2,5 – hexandion to produce the precursor [A] , then [A] was reacted with diethylmalonate to give the new tetradentate macrocyclic Ligand [H2L].This Ligand was reacted with some metal ions in ethanol to give a series of new metal complexes of the general formula [M(HnL)X]m ( where : M = Cr^III , n = 0 , X= Cl2 , m= -1 ; M = M n^II , Fe^II , Ni^II , Cu^II , n = 1 , X= Cl2 , m = -1 ; M = Co^II , n = 0 , X = Cl , m = -1 ; M = Pd^II , n = 0 , X=0 , m = 0 ; M = Cd^II , n = 2 , X = 0 , m = +2 . All compounds were characterized by sp ectroscopic methods [I.R, U.V-Vis , HPLC , Atomic Absorption] , microanalysis of elements (C.H.N) along with conductivity measurements . From the above date the proposed molecular structure for Cr^III , M n^II , Fe^II , Ni^II and Cu^II complexes is octahedral, While Co^II , Pd^II, and Cd^II form trigonal bipyramid , square planar and tetrahedral geometries respectively .