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Bipyridine Ligand Synthesis Essay

Abstract

New mixed ligand complexes of transition metals were synthesized from a Schiff base (L1) obtained by the condensation reaction of oxamide and furfural as primary ligand and 2,2′-bipyridine (L2) as secondary ligand. The ligands and their metal complexes were studied using various spectroscopic methods. Also thermal analyses were conducted. The mixed ligand complexes were found to have formulae [M(L1)(L2)]ClmnH2O (M = Cr(III) and Fe(III): m = 3, n = 0; M = Cu(II) and Cd(II): m = 2, n = 1; M = Mn(II), Co(II), Ni(II) and Zn(II): m = 2, n = 0). The resultant data revealed that the metal complexes have octahedral structure. Also, the mixed ligand complexes are electrolytic. The biological and anticancer activities of the new compounds were tested against breast cancer (MCF-7) and colon cancer (HCT-116) cell lines. The results showed high activity for the synthesized compounds.

Four ruthenium complexes bearing new (NN′S) azoimine-thiomethyl ligands L of the general type trans-[RuII(bpy)(L)(Cl)2] (C1C4) (L = YC6H4NNC(COCH3)NC6H4(2-SMe), Y = H (L1), C1; CH3 (L2), C2; Br (L3), C3; NO2 (L4), C4) have been synthesized, by the reaction of ruthenium trichloride trihydrate with the corresponding L ligands and bipyridine in refluxing ethanol. The molecular structure of trans-[Ru(bpy)(L3)(Cl)2] (C3) in the solid state is reported. The azoimine-thiomethyl ligands (L) bind as NN′ bidentate ligands with no direct Ru–S interactions. Furthermore, the complexes have been characterized by spectroscopic (IR, UV/Vis and NMR1H) and cyclic voltammetry data. The electrochemical parameters (EL(L)) of the azoimine ligands (L1L4) are reported. The electronic excitations of a representative complex (C3) are interpreted by DFT and TDDFT calculations.

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