Multiple Hydrogen Bonds Promoted ESIPT and AIE-active Chiral Salicylaldehyde Hydrazide
作者:Man Wang、Caiqi Cheng、Jintong Song、Jun Wang、Xiangge Zhou、Haifeng Xiang、Jin Liu
DOI:10.1002/cjoc.201800115
日期:2018.8
highly fluorescent salicylaldehyde hydrazide molecules (41 samples) have been designed and prepared. Even though these soft materials contain a very small π‐conjugated system, they can go through multiple intramolecular and intermolecular hydrogen bonds promoted excited‐state intramolecular proton‐transfer (ESIPT) to display strong blue, green, yellow, and orange aggregation‐inducedemission (AIE) with
Diazaborines oxidize slowly with H<sub>2</sub>O<sub>2</sub> but rapidly with peroxynitrite in aqueous buffer
作者:Jack G. Haggett、Gun Su Han、Angela R. Moser、Julian V. A. Golzwarden、Shubham Vyas、Dylan W. Domaille
DOI:10.1039/d1ob01668g
日期:——
Reactive oxygen species (ROS) such as hydrogen peroxide (H2O2) and peroxynitrite (ONOO−) oxidize arylboronic acids to their corresponding phenols. When used in molecular imaging probes and in ROS-responsive molecules, however, simple arylboronic acids struggle to discriminate between H2O2 and ONOO− because of their fast rate of reaction with both ROS. Here, we show that diazaborines (DABs) react slowly
过氧化氢 (H 2 O 2 ) 和过氧亚硝酸盐 (ONOO - )等活性氧 (ROS) 可将芳基硼酸氧化为相应的酚类。然而,当用于分子成像探针和 ROS 响应分子时,简单的芳基硼酸很难区分 H 2 O 2和 ONOO -因为它们与两种 ROS 反应速度快。在这里,我们显示二氮杂硼烷 (DAB) 与 H 2 O 2反应缓慢,但在水性缓冲液中与过氧亚硝酸盐反应迅速。除了它们与 H 2 O 2的缓慢反应外,DAB 与 H 2氧化的直接产物O 2和ONOO -可以产生动力学捕获的C N Z -异构体,其与其E -异构体缓慢平衡。总之,我们的工作表明,与芳基硼酸相比,二氮硼烷在 H 2 O 2和 ONOO之间表现出更强的动力学区分,为化学生物学中基于二氮硼烷的工具开辟了新的机会。
Mixed-ligand Cu(II) hydrazone complexes designed to enhance anticancer activity
作者:QingYou Mo、JunGang Deng、Yani Liu、GuiDong Huang、ZuoWen Li、Ping Yu、Yi Gou、Feng Yang
DOI:10.1016/j.ejmech.2018.07.022
日期:2018.8
Py = pyridine. All six Cu(II) complexes were assessed for their in vitro anticancer properties against a panel of human cancer cells, including cisplatin-resistant A549cisR cell lines. Interestingly, we observed that the 1:1:1 Cu/ligand/co-ligand mixed-ligand Cu(II) complexes exhibited higher anticancer activity than the corresponding 1:1 Cu(II)/ligand complexes. In particular, the 1:1:1 Cu(II)/ligand/co-ligand
配体的数量,配体类型和配位几何形状对金属基复合物的抗癌活性具有重要影响。根据先前报道的1:1 Cu(II)/配体配合物([Cu(L1)Cl]·2H 2 O 1a,[Cu(L2)Cl]·H 2 O 2a和[Cu( L2)NO 3 ]·H 2 O 3a),我们随后设计,开发和表征了一系列相应的1:1:1 Cu(II)/配体/共配体配合物([Cu(L1)(Py)Cl ]·H 2 O 1b,[Cu(L2)(Py)Cl] 2b和[Cu(L2)(Py)NO 3 ] 3b),其中L1 =(E)-N'-(2-羟基亚苄基)乙酰肼,L 2 =(E)-N ′-(2-羟基亚苄基)苯并酰肼,Py =吡啶。评估了所有六种Cu(II)复合物对一组人类癌细胞的体外抗癌特性,其中包括抗顺铂A549cisR细胞系。有趣的是,我们观察到1:1:1的Cu /配体/共配体混合配体Cu(II)配合物比相应的1:1的Cu(II)/配体
Abstract A hitherto unknown linear, tetranuclear nickel(II/III) complex possessing both square-planar and pentagonal bipyramidal geometry around the metal ions was obtained from the reaction of ONO pincer ligand (E)-N′-(2-hydroxybenzylidene)acetohydrazide with [NiCl2(PPh3)2] precursor complex in methanol medium. The novel ONO ligand and its nickelcomplex were characterized by analytical and spectral
Weak Interactions Modulating the Dimensionality in Supramolecular Architectures in Three New Nickel(II)-Hydrazone Complexes, Magnetostructural Correlation, and Catalytic Potential for Epoxidation of Alkenes under Phase Transfer Conditions
作者:Dipali Sadhukhan、Aurkie Ray、Guillaume Pilet、Corrado Rizzoli、Georgina M. Rosair、Carlos J. Gómez-García、Sandra Signorella、Sebastián Bellú、Samiran Mitra
DOI:10.1021/ic200846j
日期:2011.9.5
antiferromagnetic interactions operate between phenoxo bridged Ni(II) dimers in 1 and 2 whereas very weak antiferromagnetic exchange occurs through hydrogenbonding and π–π stacking interactions in 3. All complexes are proved to be efficient catalysts for the epoxidation of alkenes by NaOCl under phase transfer condition. The efficiency of alkene epoxidation is dramatically enhanced by lowering the pH, and the