A new Salen-type azo-azomethine ligand and its Ni(II), Cu(II) and Zn(II) complexes: Synthesis, spectral characterization, crystal structure and photoluminescence studies.

摘要: Abstract A novel Salen-type azo–azomethine ligand H2agen, 2,2′-{ethane-1,2-diylbis[nitrilomethylylidene]}bis{4-[ethylphenyldiazenyl]phenol}, formed by the 1:2 M condensation of ethane-1,2-diamine with 5-[(4-ethylphenyl)diazenyl]-2-hydroxybenzaldehyde and its nickel(II), copper(II), zinc(II) complexes were synthesized characterized spectroscopic analytical methods. The UV–vis spectra investigated in three organic solvents (DMSO, DMF CHCl3). shows two absorption bands assigned to π–π∗ n–π∗ transitions used. Cu(II), Ni(II) are tetra-coordinate binding phenolic oxygens imine nitrogens approximate square planar geometry. Zn(II) also coordinates using same sites like other metals but gave tetragonal configuration. Molecular structure Cu(II) complex [Cu(agen)] was determined single crystal X-ray diffraction study. data revealed that crystallographic imposed symmetry absent for molecule. In structure, ion is coordinated phenolate oxygen atoms nitrogen azo-azomethine H2agen metal exhibit strong blue emissions irradiation. Fluorescence quantum yields excited-state lifetimes obtained. had a 35% yield 3.27 ns lifetime. Complexation ions caused reductions intensities yields.