Synthesis, characterization, and biological investigation of new mixed‐ligand complexes
A novel series of mixed‐ligand complexes of 5,5′‐{(1E,1E′)‐1,4‐phenelynebis(diazene‐2,1‐diyl)}bis(quinolin‐8‐ol) (H2L1) as a primary ligand and 4‐aminoantipyrine(L2) as a secondary ligand with Mn(II) ion were prepared using two general formulae: [Mn2(H2L1)2(L2)2X4].4Cl (X = OH2(1), ONO2−(2), Cl=nil; OAc(3), Cl = nil) and [Mn2(H2L1)(L2)2(O2SO2)2](4). Free ligands and their complexes were characterized. Electronic absorption spectra of the mixed‐ligand complexes indicate a distorted octahedral geometry around the central metal ion, and the anions X− are in the axial positions for all compounds. The ligands behave in a neutral bidentate manner, through nitrogen atoms and oxygen atoms of the carbonyl group (L2), whereas H2L1 coordinated through nitrogen and OH groups as a neutral bidentate ligand. All complexes do not contain coordinated water molecules, but complex (1) contains four water