Three Cu(II) complex compounds with 4-methoxybenzaldehyde-2-benzothiazolyl hydrazone (HL) have been prepared and characterized by elemental and thermogravimetrical analysis, infrared, electronic and EPR spectra. The complex compounds have various composition and stereochemistry, depending on the reaction conditions and the metal salt used. The ligand acts as neutral bidentate NN donor in the complexes [Cu(HL) 2 (H 2 O) 2 ] . Cl 2 and [Cu(HL) 2 (H 2 O)Br] . Br and monobasic bidentate donor in the complex [Cu 2 L 4 ].EPR studies of the complexes gave axial symmetry, with d x2-y2 the ground state. The bonding parameters calculated from the electronic and EPR spectra indicate strong in-plane π-bonding for all the complexes. Investigations on antibacterial and antifungal activities show that the complexes are more active than the free ligand.
Three Cu(II) complex compounds with mixed hydrazone ligands have been prepared and characterized in view of their potential biological activity. The complex compounds have the formulas: [Cu(HLa)(Lc)Br], [CuLaLc] and [CuLbLc] . Na, where HLa = 4-dimethylamino benzaldehyde-2-benzothiazolyl hydrazone, H2Lb = 2-hydroxybenzaldehyde-2-benzothiazolyl hydrazone and HLc = 2-hydroxy-1-naphthyliden-N,N-dimethyl hydrazone. The complexes have been characterized by elemental and thermogravimetrical analysis, infrared, electronic and EPR spectra. EPR spectral studies of the complexes gave axial symmetry, with the ground state. The bonding parameters calculated from the electronic and EPR spectra indicate strong in-plane p-bonding for all the complexes. Investigations on antibacterial and antifungal activities show that the complexes are more active than the free ligands against various Gram positive, Gram negative bacteria and fungi.
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