Two mononuclear zinc(II) complexes of newly designed carboxamide derivatives, formulated as [Zn(L1)3](ClO4)2 (1) and [Zn(L2)3](ClO4)2 (2) [where L 1 = N-(furan-2-ylmethyl)-2-pyridinecarboxamide and L 2 = N-(thiophen-2-ylmethyl)-2-pyridine-carboxamide], have been isolated in pure form in the reaction of perchlorate salts of Zn(II) with ligands L 1 and L 2 , respectively. The two complexes were characterized by physicochemical and spectroscopic tools, and by X-ray crystal structures of both ligands and the complex 1. In complex 1, zinc(II) is chelated by three ligands with a distorted octahedral geometry. The DNA-binding properties of zinc complexes 1 and 2 have been investigated by spectroscopic methods and viscosity measurements. The results suggest that both complexes 1 and 2 bind to DNA in an intercalation mode between the uncoordinated furan or thiophene chromophore and the base pairs of DNA.
新设计的羧酰胺衍
生物的两种单核
锌(II)配合物,分子式分别为 [Zn(L1)3](
ClO4)2 (1) 和 [Zn(
L2)3]( )2 (2) [其中 L1 = N-(
呋喃-2-甲基)-2-
吡啶羧酰胺,
L2 = N-(
噻吩-2-甲基)-2-
吡啶羧酰胺],分别在
高氯酸盐与
配体 L1 和
L2 的反应中以纯净形式分离得到。这两种配合物通过物理
化学和光谱工具进行了表征,并通过两种
配体和配合物 1 的 X 射线晶体结构进行了确认。在配合物 1 中,
锌(II)与三个
配体螯合,形成扭曲的八面体几何结构。通过光谱方法和黏度测量研究了
锌配合物 1 和 2 的 DNA 结合性质。结果表明,配合物 1 和 2 均以插入模式结合到 DNA 中,插在未配位的
呋喃或
噻吩生色团与 DNA 碱基对之间。