Dependence of the Chemical Properties of Macrocyclic [Ni<sup>II</sup><sub>2</sub>L(μ-O<sub>2</sub>CR)]<sup>+</sup>Complexes on the Basicity of the Carboxylato Coligands (L<sup>2−</sup>= macrocyclic N<sub>6</sub>S<sub>2</sub>ligand)
作者:Ulrike Lehmann、Julia Klingele、Vasile Lozan、Gunther Steinfeld、Marco H. Klingele、Steffen Käss、Axel Rodenstein、Berthold Kersting
DOI:10.1021/ic101574a
日期:2010.12.6
carboxylates. The resulting carboxylato complexes, isolated as ClO4− or BPh4− salts, have been fully characterized by elemental analyses, IR, UV/vis spectroscopy, and X-ray crystallography. The possibility of accessing the [NiII2L(μ-O2CR)]+ complexes by carboxylate exchangereactions has also been examined. The main findings are as follows: (i) Substitution reactions between 1 and NaO2CR are not affected
Three- and four-coordinate Ag(I) complexes of crotonate and bis(benzimidazole)-2-oxapropane ligands: syntheses, crystal structures, DNA-binding studies and antioxidant activities
Two V-shaped ligands, namely 1,3-bis(1-ethylbenzimidazol-2-yl)-2-oxapropane (etobb) and 1,3-bis(1-benzylbenzimidazol-2-yl)-2-oxapropane (bobb), have been prepared. Reaction of these ligands with AgNO3 and sodium crotonate under in the dark afforded the complexes, [Ag(etobb)2](crotonate)·C2H5OH·2(CH3CN)·2(H2O) 1 and [Ag(crotonate)(bobb)] 2. Both complexes have been characterized by physicochemical and spectroscopic methods and also by X-ray single-crystal diffraction. The coordination environment of complex 1 can be described as distorted tetrahedral, while complex 2 has as a trigonal planar geometry. The DNA-binding properties of these complexes have been investigated by fluorescence, electronic absorption and viscosity measurements. The experimental results suggest that they bind to DNA by an intercalation mode. Complex 2 also exhibits excellent hydroxyl radical scavenging activity.
制备了两种 V 形配体,即 1,3-双(1-乙基苯并咪唑-2-基)-2-氧代丙烷(etobb)和 1,3-双(1-苄基苯并咪唑-2-基)-2-氧代丙烷(bobb)。在黑暗条件下,这些配体与 AgNO3 和巴豆酸钠反应,得到了[Ag(etobb)2](巴豆酸钠)-C2H5OH-2(CH3CN)-2(H2O) 1 和 [Ag(crotonate)(bobb)] 2 复合物。这两种复合物都通过理化和光谱方法以及 X 射线单晶衍射法进行了表征。络合物 1 的配位环境可以描述为扭曲的四面体,而络合物 2 的几何形状则为三棱锥平面。通过荧光、电子吸收和粘度测量,研究了这些复合物的 DNA 结合特性。实验结果表明,它们是通过插层模式与 DNA 结合的。络合物 2 还具有出色的羟自由基清除活性。
V-shaped ligand bis(2-benzimidazolylmethyl)amine containing three copper(ii) ternary complexes: synthesis, structure, DNA-binding properties and antioxidant activity
作者:Huilu Wu、Hua Wang、Xiaoli Wang、Guolong Pan、Furong Shi、Yanhui Zhang、Yuchen Bai、Jin Kong
DOI:10.1039/c3nj01145c
日期:——
in the V-shaped ligand. Such a trend in the DNA-binding affinities of the bba ligand and copper(II) complexes binding to DNA can be reasonably explained by the change of the electron density, the V-shaped angle (αV) and the value of τ. Moreover, the antioxidant assay in vitro also shows that the copper(II) complexes possess significant antioxidantactivities.
Thermal reaction of sodium and potassium salts of methacrylicâcrotonic acids in the solid state selectively affords a cross-coupled dimer, dimethyl hex-1-ene-2,4-dicarboxylate.