| Abstract: Two Salen-type ligands H2L1 (N-phenyl-N-(2-hydroxyl -5-methylphenyl)-N′-(2,5-dihydroxyphenyl)-4,5-dimethoxyl-o-phenyldiamine), H2L2(N-phenyl-N-(2-hydroxy-5-methylphenyl)-N′-(2-hydroxy-3,5-di-tert-butylphen-yl)-4,5-dimethoxyl-o-phenyldiamine) and their metal complexes MLn (M=Ni, Cu, Mn; n=1, 2) were synthesized and characterized by 1H NMR, ESI-MS, elemental analysis, FTIR, UV-Vis spectra. The fluorescence properties of H2L1, H2L2 and their metal complexes have been studied. The influences of the ligands structures and central metal ions were also investigated. Because of the effect of the hydrogen bonds, the fluorescence intensity of H2L1 was far lower than that of H2L2. However, the embedded central ions of Ni(Ⅱ), Cu(Ⅱ) and Mn(Ⅱ) showed the quenching effect on fluorescence of H2L2. The electrochemical redox properties of H2L1, H2L2 and their metal complexes were investigated by cyclic voltammetry. In addition, the solution conduction properties of the research system were explored through the determination of conductivity and the molar conductivity. As a result, the oxidation-reduction processes of Ni(Ⅱ), Cu(Ⅱ) and Mn(Ⅱ) complexes were quasi reversible single-electron processes, whereas the embedded Mn(Ⅱ) made the conductive ability of the Mn(Ⅱ) complex solution enhance greatly. |
