A copper-coordinated complex based on 7-membered amide cycle has been designed and synthesized. Its binding properties for various nucleosides, guanosine-5-diphosphate (GDP), uridine-5-diphosphate (UDP), inosine-5- diphosphate (IDP) and guanosine-5-triphosphate (GTP) has been studied by UV-visible spectra and crystal structure. Results indicated that the compound showed the highest binding ability with guanosine-5-triphosphate in water solution among the studied nucleosides. The interaction of host-guest derived from hydrogen bonding and p-p staking and the host-guest binding ability depended on the chain length of nucleosides. In addition, the compound can be used to label nucleoside.
Synthesis and fluorescence studies of nine 1,5-benzodiazepine-2,4-dione derivatives: Dual emission and excimer fluorescence
作者:Hamid Reza Qomi、Azizollah Habibi、Seyyed Mohammad Shahcheragh
DOI:10.1016/j.saa.2016.11.028
日期:2017.3
absorption and fluorescence spectral techniques in dimethyl sulfoxide. The trend of red shifts caused by the substitutions had full compliance with the trend of decreasing the calculated band gap (ΔELUMO-HOMO) by semi-empirical AM1 and DFT/B3LYP/6-311 + G* computational methods. The positive solvatochromism of BZD a demonstrated the π–π* nature of the singlet excited state. Dual fluorescence was observed
使用吸收和荧光光谱技术在二甲基亚砜中研究了九种1,5-苯并二氮杂-2,4-二酮(BZD)衍生物的光物理性质。由取代引起的红移趋势完全符合通过半经验AM1和DFT / B3LYP / 6-311 + G *计算方法减小计算带隙(ΔELUMO -HOMO)的趋势。BZD a的正溶剂变色现象证明了单重激发态的π–π *性质。在BZD f和g的发射光谱中观察到双重荧光,而它们在不同浓度下的光谱在稀溶液中仅显示一个峰值短波长(SW)。SW的主峰在370 nm附近,归因于BZD(f *或g *),并且较宽的发射移至中波长(MW)处约400 nm的可见区,变为BZD的分子间受激准分子发射([ f / f ] *或[ g / g ] *)。观察到的现象,例如溶剂变色,双重荧光,由取代引起的一些红移和更大的斯托克斯频移,表明BZDs系列中存在分子内电荷转移(ICT)。BZD的磷光发射证明了它们的系统间交叉(ISC)过程。
Anion recognition based on phenolic hydroxyl group in competitive media
Two novel artificial receptors, one containing phenolic hydroxyl group and diamide (1), the other only containing diamide (2), were designed and synthesized. The binding ability evaluated by UV–vis and fluorescence titration experiments in dry DMSO revealed that compound 1 could selectively recognize AcO−. In particular, the binding ability can also be detected in the DMSO/H2O solution by UV–vis. The interference experiment result showed that the binding ability was not influenced by the existence of other anions. In contrast, there were no detectable interaction between receptor 2 and anions. The further insights to the nature of interaction between receptor 1 and AcO− were investigated by 1H NMR titration experiments and theoretical investigation, which demonstrated receptor 1 complexed AcO− through the synergistic hydrogen bonding interaction of OH and NH.
A supramolecular optic sensor for selective recognition AMP
作者:Xue-Fang Shang、Hongyan Su、Hai Lin、Hua-Kuan Lin
DOI:10.1016/j.inoche.2010.04.006
日期:2010.8
Cu-coordinated complex based on 7-membered amide cycle has been designed and synthesized. And its binding ability with nucleotides (AMP, adenosine 5'-monophosphate; ADP, adenosine 5'-diphosphate; ATP, adenosine 5'-triphosphate) has been studied by UV-vis spectrum. Results indicate that the receptor shows the highest binding ability with AMP among studied nucleotides and can selectively and strongly bind nucleotides at neutral medium. The receptor can be used as optical sensor for the detection of AMP. (C) 2010 Elsevier B.V. All rights reserved.