A new ligand N,N'-bis[(1-phenyl-3-methyl-5-oxo-4-pyrazolinyl)-2-thenoylmethylidyne]ethyl-enediimine(HPMTHP)2en and its five complexes have been sythesized. These complexes have the general formula [M(PMTHP)2en], where M=Cu(Ⅱ), Ni(Ⅱ), Co(Ⅱ), Pd(Ⅱ), Pt(Ⅱ).They were characterized by elemental analysis, IR, UV-vis, magnetic moments and molar conductance. The results showed that the complexes are all of quadricoordinate square-planar geometry. The antibacterial experiment indicated that they have high antibacterial activities against S. aureus, B. subtillis, E.coli, E. carotovora, C. flaccumfaciens.
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