从机理的角度出发,研究了异羟肟酸释放出具有多种生物学特性的无机小分子硝基氧(HNO)的氧化剂依赖性。实际上,在生理条件下异羟肟酸氧化的确切机理以及中间体的直接或间接表征仍然难以捉摸。在这项工作中,通过1 H NMR,MS,EPR和UV-vis技术监测了在生理pH(7.4)下用K 3 [Fe III(CN)6 ]对异烟酸酯,烟酸酯和吡嗪酮异羟肟酸的分子间氧化反应。。虽然nitrosocarbonyl(二)吖嗪中间体,(二)AZ-C(O)-NO,可以是先验设想,它实际上对应Ñ,识别出的O-二(二)叠氮酰基羟胺(AzC(O)NHOC(O)Az)和HNO,第一个通过1 H NMR,第二个基于EPR和UV-vis实验,使用[2-(4 -羧基苯基)-4,4,5,5-四甲基咪唑啉-1-氧基-3-氧化物](cPTIO)自旋阱。不稳定的N,O-二(二)叠氮酰基羟胺中间体在水性缓冲介质中的分解显示产生相应的羧
Near-Infrared Optical Imaging of Necrotic Cells by Photostable Lanthanide-Based Metallacrowns
作者:Ivana Martinić、Svetlana V. Eliseeva、Tu N. Nguyen、Vincent L. Pecoraro、Stéphane Petoud
DOI:10.1021/jacs.7b01587
日期:2017.6.28
photobleaching of several types of organic fluorophores and/or the interference generated by biological autofluorescence. Herein, we synthesized novel biologically compatible Zn2+/Ln3+ metallacrowns (MCs) that possess attractive near-infrared (NIR) emission and are highly photostable. In addition, these MCs have the ability to label differentially necrotic HeLa cells from living cells. This work is also the first
细胞坏死的灵敏检测对于确定细胞活力至关重要。由于其在细胞水平上的高分辨率和灵敏度,光学成像对于识别细胞坏死非常有吸引力。然而,与该技术相关的挑战仍然存在,例如几种类型的有机荧光团的快速光漂白和/或生物自发荧光产生的干扰。在此,我们合成了具有有吸引力的近红外 (NIR) 发射和高度光稳定性的新型生物相容性 Zn2+/Ln3+ 金属冠 (MC)。此外,这些 MCs 能够标记来自活细胞的不同坏死 HeLa 细胞。
A family of 1D coordination polymers based on Ln–Cu 15-metallacrown-5 units with two topological sorting: syntheses, structures, and single-chain magnet behaviour
one-dimensional coordination polymers based on Ln–Cu 15-metallacrown-5 units were self-assembled via covalent bonds between pyrazine hydroxamic acid ligands and Cu atoms in the adjacent MC units. Due to the presence of different coordination anion ligands, complexes TbIII (1) and GdIII (2) show zig-zag-like topological structures, while complex DyIII (3) displays wheatear-like topological structure. The frequency
三个基于 Ln-Cu 15-metallacrown-5 单元的一维配位聚合物通过吡嗪异羟肟酸配体与相邻 MC 单元中的 Cu 原子之间的共价键自组装。由于存在不同的配位阴离子配体,配合物Tb III ( 1 ) 和Gd III ( 2 )呈现锯齿状拓扑结构,而配合物Dy III ( 3 ) 呈现麦穗状拓扑结构。异相的频率依赖性表明配合物1和2表现出缓慢的磁化弛豫,而配合物3表现出单链磁体行为。
A New Family of 2D Coordination Polymers Based on 3d‐4f 15‐Metallacrown‐5 Units: Synthesis, Structure, and Single‐Molecule Magnet Behavior
A new family of 2Dcoordinationpolymersbased on 3d‐4f 15‐metallacrown‐5 (MC) units were designed and characterized. The connection of the 15‐metallacrown‐5 subunits by the coordination of CuII and ligand led to the formation of 2D network of metallacrowns. Analysis of the magnetic properties of these coordinationpolymers reveals that the GdIII (1), TbIII (2), and DyIII (3) complexes exhibit slow
Abstract Reaction of copper(II) triflate, terbium(III) triflate (5/1 equiv.) with pyrazinehydroxamic acid (H2pyzha) in MeOH solution led to a new heterobimetallic 15-metallacrown-5 complex. In solid state the structure of this complex has been confirmed by X-ray analysis: metallacrown [Tb(H2O)3Cu(pyzha)}5(H2O)3] (TfO)2·3(H2O)·(MeOH) (TfO = trifluomethanesulfonate). Analysis of the magnetic properties
Heterometal–organic frameworks: Three novel copper(II)–lanthanide(III) 15-metallacrown-5 complexes based on pyrazinohydroxamic acid as new multiple-binding pentagonal platform
作者:Yu Wang、Wen-Shi Wu、Miao-Ling Huang
DOI:10.1016/j.cclet.2015.12.006
日期:2016.3
[Sm (H 2 O) 3 Cu(pyzha)} 5 (H 2 O) 2 (MeOH) (HSO 4 ) 2 ]·(H 2 O) 2 ·(HSO 4 ) ( 1 ); [Nd(H 2 O) 2 (MeOH) Cu(pyzha)} 5 (ClO 4 ) 2 (H 2 O) 5 (NO 3 )] ( 2 ); [Eu(H 2 O) 2 (MeOH) Cu(pyzha)} 5 (ClO 4 ) 2 (H 2 O) 5 (NO 3 )] ( 3 ). The differentiation of atomic and ionic radii between the encapsulated lanthanide(III) could be used to control the bowl-shape distortion of the metallacrowns from the planar
摘要硫酸铜(II)或高氯酸铜(II),sa(III),nitrate(III)或钕钕(III)(5/1当量)与吡嗪基异羟肟酸(H 2 Pyzha)在H 2 O /中的反应MeOH生成了三种新的异双金属15-metallacrown-5配合物。在MeOH / H 2 O溶液中,当添加无机盐时,配体以质子化的金属内酰胺形式存在。通过X射线分析证实,在固态下,它们的结构更为复杂:金属催乳素[Sm(H 2 O)3 Cu(pyzha)} 5(H 2 O)2(MeOH)(HSO 4)2]···································································································································································