A Tb2 complex based on polydentate Schiff base:Crystal structure,fluorescence properties,and biological activity
A new lanthanide binuclear Tb(Ⅲ)-based complex with the formula[Tb2(L)(H2L)]·2CH3OH·CH3CN(1)have been synthesized via the solvothermal method by using a polydentate Schiff base ligand(H4L=N',N"-((1E,1'E)-(1,10-phenanthroline-2,9-diyl)bis(methaneylylidene))bis(2-hydroxybenzohydrazide))reacting with Tb(acac)3·2H2O(acac-=acetylacetonate).It was characterized by IR,elemental analysis,single-crystal and powder X-ray dif-fraction.Single-crystal X-ray structure analysis reveals that complex 1 belongs to the triclinic system with P1 space group,and the asymmetric unit mainly includes two TbⅢ ions and two different deprotonated ligands(L4-and H2L2-).Both centre Tb1 and Tb2 ions are nine-coordinated with a[N4O5]coordination environment.The coordination geome-try is shown as a distorted hula-hoop.In addition,the biological activity study shows that the complex has stronger antibacterial activity than H4L and Tb(acac)3·2H2O.The interaction between 1 and DNA was studied by UV-Vis spectroscopy,cyclic voltammetry,gel electrophoresis,and fluorescence spectroscopy.The results reveal that 1 could bind to calf thymus DNA mainly by intercalation.Ethidium bromide(EB)displacement experiments indicated that Stern-Volmer quenching constants of complexes 1 and H4L were 1.04 and 0.30,respectively.CCDC:2293742.
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