Synthesis and cation complexation of calix[4]azacrowns and a spirobiscalix[4]azacrown
作者:Abdelwaheb Hamdi、Mohamed Habib Noomen、Rym Abidi、A. Rim Woo、Jeong Hwan Cho、Yang Kim
DOI:10.1007/s10847-011-0029-0
日期:2011.12
The synthesis and complexation properties of three new derivatives, one spirobiscalix[4]azacrown (1) and two calix[4]azacrown (2 and 3), are reported. Complexation studies of the three ligands toward transition and heavy metal cations have been carried out and monitored by UV absorption spectrophotometry in acetonitrile. Mononuclear complexes were detected for all complexes, whereas binuclear species
A novel (μ-OAc)2 bridged unsymmetric coordinated binuclear Mn(II) macrocyclic complex with ligating pendant-arm
作者:Zhi-Quan Pan、Wen-Hao Ni、Hong Zhou、Xue-Lei Hu、Qi-Mao Huang、Juan Kong
DOI:10.1016/j.inoche.2008.09.001
日期:2008.11
Abstract A novel binuclear manganese Mn(II) macrocyclic complex with two pyridylmethylpendantarms, [Mn2II(H2L)(μ-OAc)2](ClO4)2 · H2O, has been synthesized and characterized crystallographically and magnetically. The crystal structure of the complex shows that two manganese ions locate in the same head of the macrocycle, leaving an uncoordinating cavity to catch protons through oxide of phenolate
摘要 合成了一种具有两个吡啶甲基悬臂的新型双核锰Mn(II)大环配合物[Mn2II(H2L)(μ-OAc)2](ClO4)2·H2O,并对其进行了晶体学和磁学表征。该配合物的晶体结构表明,两个锰离子位于大环的同一个头部,留下一个不配位的空腔,通过酚盐的氧化物和另一个头部附近的亚胺基团捕获质子。电化学研究表明,该配合物产生两对氧化还原峰,E1/2 分别为 0.3775 V 和 0.8409 V。样品的变温磁化率测量显示两种锰 (II) 之间存在弱的反铁磁相互作用,J = -3.733(7) cm-1。该配合物表现出中等的催化 H2O2 歧化为 O2 的活性。
Design and synthesis of two macrocyclic dinuclear copper(II) complexes with reversible binding of nitric oxide
作者:Yunfeng Chen、Huiting Song、Jiawei Mao、Ming Liu、Chao Ding、Zhiquan Pan
DOI:10.1016/j.inoche.2012.10.037
日期:2013.1
Abstract Two new macrocyclicdinuclearcopper(II) complexes, [Cu2L1(MeOH)2]·(ClO4)2 (1) and [Cu2L2(EtOH)2]·(ClO4)2 (2) have been synthesized and characterized by ES-MS spectra and X-ray crystallography determination. The coordination polyhedron of Cu(II) ions in each complex can be described as approximately square pyramind, where the apical position is occupied by a labile coordinated alcoholic molecule
摘要 合成了两种新的大环双核铜 (II) 配合物 [Cu2L1(MeOH)2]·(ClO4)2 (1) 和 [Cu2L2(EtOH)2]·(ClO4)2 (2),并用 ES- MS 光谱和 X 射线晶体学测定。每个配合物中铜(II)离子的配位多面体可以描述为近似方形金字塔,其中顶端位置被不稳定的配位醇分子占据。配合物与一氧化氮 (NO) 的反应会立即引起颜色变化,并且通过紫外/可见分光光度法进一步证实了 NO 配合物的形成。在 0.2 M 厌氧磷酸盐缓冲溶液 (PBS) 中,计算出的结合常数分别为 1.71 × 103 M- 1 和 2.0 × 103 M- 1。对照实验表明 NO 与复合物的结合是可逆的。而且,复合物与小牛胸腺 DNA (CT-DNA) 的相互作用已通过 UV/Vis、循环伏安法和粘度研究进行测量。适度的结合能力和不明显的 DNA 切割能力是它们对 DNA 的低毒性的原因
Studies of pendant-arm macrocyclic ligands. Part 8. Synthesis of two pentaazamacrocycles based upon pyridine-containing tetraazamacrocycles with a single pendant co-ordinating 2-pyridylmethyl arm, and characterisation of their nickel(<scp>II</scp>), copper(<scp>II</scp>) and zinc(<scp>II</scp>) complexes. Crystal structure of 7-(2′-pyridylmethyl)-3,7,11,17-tetraazabicyclo[11.3.1]heptadeca-1(17),13,15-trienezinc(<scp>II</scp>) tetrafluoroborate
作者:Simon J. Grant、Peter Moore、Hadi A. A. Omar、Nathaniel W. Alcock
DOI:10.1039/dt9940000485
日期:——
together with their metal complexes of formulae [ML(OH2)][BF4]2(M = Ni or Cu) and [ZnL][BF4]2(L = L1 or L2). The crystalstructure of [ZnL1][BF4]2 shows a distorted square-pyramidal geometry, with the Zn 0.59 Å above the plane of the macrocyclic ring in the direction of the pendant co-ordinated pyridyl group.