Viologen-Mediated Assembly of and Sensing with Carboxylatopillar[5]arene-Modified Gold Nanoparticles
摘要:
Carboxylatopillar[5]arene (CP[5]A), a new water-soluble macrocyclic synthetic receptor, has been employed as a stabilizing ligand for in situ preparation of gold nanoparticles (AuNPs) to gain new insights into supramolecular host-AuNP interactions. CP[5]A-modified AuNPs with good dispersion and narrow size distributions (3.1 +/- 0.5 nm) were successfully produced in aqueous solution, suggesting a green synthetic pathway for the application of AuNPs in biological systems. Supramolecular self-assembly of CP[5]A-modified AuNPs mediated by suitable guest molecules was also investigated, indicating that the new hybrid material is useful for sensing and detection of the herbicide paraquat.
Synthesis of benzo[6]urils and their selective interactions with bipyridines
作者:Man Chen、Hai-Ling Li、Hang Cong、Yan Yan、Kai-Li Li、Ming-Qiong Li、Zhu Tao
DOI:10.1039/c7nj02786a
日期:——
macrocyclic compounds, benzo[6]urils bearing hydroxymethyl or methyl groups, have been synthesized under mild conditions in high yields. These macrocycles have been employed as hosts to encapsulate bipyridine guests. Fluorescence spectrometric titrations confirmed the formation of interaction complexes in a 1 : 1 ratio and curve-fitting of the decreases in fluorescence intensity of the benzo[6]urils in
新型的大环化合物,带有羟甲基或甲基的苯并[6]基,是在温和条件下以高收率合成的。这些大环化合物已被用作包封联吡啶客体的宿主。荧光光谱滴定法证实以1:1的比例形成了相互作用的配合物,并且在存在客人的情况下,苯并[6] urils的荧光强度下降的曲线拟合提供了大约1.5×10 3 –1.3的适度缔合常数×10 6 L mol -1。超分子复合物的稳定性被证明既取决于客体的结构又取决于存在于主体上的取代基。主客体相互作用也被探测借助于11 H NMR光谱法,观察到加入客体时苯并[6]脲的共振的小位移。DFT计算结果表明,苯并[6] urils的包封能力应取决于客体的电子结构。
A series of viologen-based receptors have been synthesized and their anion-binding properties have been investigated by-NMR, UV-visible spectroscopy, electrochemistry and X-ray diffraction analyses. Linking two positively charged viologens through a propyl chain promotes a remarkable chelate-like binding of chlorides revealed by 1H-NMR spectroscopy. Of all the anionic species investigated, only fluoride is detectable by the naked eye and by electrochemical methods. The reduction-triggered formation of a π-dimer from two viologen-based cation radicals was also investigated by electrochemical and spectroelectrochemical methods and by theoretical calculations.
Charge-transfer interactions for the fabrication of multifunctional viral nanoparticles
作者:Jun Hu、Peiyi Wang、Xia Zhao、Lin Lv、Song Yang、Baoan Song、Qian Wang
DOI:10.1039/c4cc05195e
日期:——
In this paper, a facile strategy to fabricate multifunctional viral nanoparticles was described by introducing charge-transfer interactions between a pyrenyl motif with dinitrophenyl and pyridinium-contained guest molecules.
作者:P. A. Buikin、A. B. Ilyukhin、V. K. Laurinavichyute、V. Yu. Kotov
DOI:10.1134/s0036023621020042
日期:2021.2
2H2O (I) isostructural to the well-known chlorobismuthate [MV]3[BiCl6]2 · 2H2O has been prepared from an aqueous solution and cha-racterized by X-ray diffraction. The reaction between I and concentrated HBr leads to the formation of acidic methylviologen bromobismuthate-bromide [H3O]2[MV][BiBr6]Br · 4H2O (II) and a minor impurity of bromobismuthate tribromide [MV]3[Bi2Br9][Br3]3 (III). The acidic bromobismuthate
Correlating Solution Binding and ESI-MS Stabilities by Incorporating Solvation Effects in a Confined Cucurbit[8]uril System
作者:Urs Rauwald、Frank Biedermann、Stéphanie Deroo、Carol V. Robinson、Oren A. Scherman
DOI:10.1021/jp102933h
日期:2010.7.8
ternary complexes of the macrocyclic host cucurbit[8]uril (CB[8]). The binding affinities of 32 aromatic reference complexes were studied by ITC and ESI-MS and combined with solvation data of the guests from an implicit solvation model (SM8) to obtain a correlation between aqueous and gas-phase measurements. The data illustrates the critical importance of solvation on the binding strength in CB[8]’s ternary