Bis- and tris-naphthoimidazolium derivatives for the fluorescent recognition of ATP and GTP in 100% aqueous solution
作者:Zhaochao Xu、Na Ri Song、Jong Hun Moon、Jin Yong Lee、Juyoung Yoon
DOI:10.1039/c1ob06344h
日期:——
Naphthoimidazolium groups can form unique ionic hydrogen bonds with anions as imidazolium moieties, and in addition, they are fluorescent, so no further elaborative synthesis is needed to introduce a fluorescent group. In this paper, three naphthoimidazolium derivatives were synthesized and studied for the recognition of nucleotides. Compound 1 composed of a single naphthoimidazolium group and quaternary ammonium group did not show any significant fluorescent changes with various anions and nucleotides, such as ATP, GTP, CTP, TTP, UTP, ADP and AMP. A tripodal compound 3 bearing three naphthoimidazolium groups and three quaternary ammonium groups, respectively, showed large fluorescence enhancements with UTP, CTP and TTP and moderate fluorescence enhancements with ATP and pyrophosphate and a fluorescence quenching effect with GTP. On the other hand, compound 2 bearing two naphthoimidazolium groups and two quaternary ammonium groups displayed a selective fluorescence enhancement with ATP and a selective fluorescence quenching effect with GTP in 100% aqueous solution.
which is made up of electron-deficient bowl frameworks, three coordination-induced neutral polar C–H donors, and a phenyl motif, were self-assembled via a one-pot approach; the endocavity accommodates fluoride selectively in the presence of other halides.
In vitro cytotoxicity studies of self-assembled compact trinuclear rhenium(I) based metallocages display anticancer, antimetastatic, antiproliferative and DNA damaging behavior towards human cervical cancer cells comparable to that of cisplatin.
基于铼(I)的自组装紧凑型三核金属载体的体外细胞毒性研究显示,其对人类宫颈癌细胞的抗癌、抗转移、抗增殖和 DNA 损伤作用与顺铂相当。
Induction-Driven Stabilization of the Anion-π Interaction in Electron-Rich Aromatics as the Key to Fluoride Inclusion in Imidazolium-Cage Receptors
作者:Zhaochao Xu、N. Jiten Singh、Sook Kyung Kim、David R. Spring、Kwang S. Kim、Juyoung Yoon
DOI:10.1002/chem.201002105
日期:2011.1.24
experimental evidence of the anion–πinteraction between electron‐rich alkylbenzene rings and a fluoride ion in CH3CN. The cyclophane cavity bridged with three naphthoimidazolium groups selectively complexes a fluoride ion by means of a combination of anion–πinteractions and (CH)+⋅⋅⋅F−‐type ionic hydrogen bonds. 1H NMR, 19F NMR, and fluorescence spectra of 1 and 2 with fluoride ions are examined to show
涉及芳香环的分子间相互作用是化学和生物识别中的关键过程。众所周知,阴离子与缺电子的(π酸性)芳族化合物之间存在阴离子-π相互作用,这表明富含电子的(π-碱性)芳族化合物由于其给电子性而会排斥阴离子。在这里,我们报告了CH 3 CN中富电子的烷基苯环与氟离子之间阴离子-π相互作用的第一个具体理论和实验证据。所述环芳空腔具有三个naphthoimidazolium基团桥连的由阴离子-π相互作用的组合来选择性地络合氟化物离子和(C 1H)+ ⋅⋅⋅ ˚F -型离子氢键。通过1 H NMR,19 F NMR以及带有氟离子的1和2的荧光光谱进行了研究,结果表明只有2个可以在两个烷基苯环之间的空腔中形成一个氟离子,从而形成三明治复合物。此外,笼状化合物可以用作氟离子的高选择性和比例式荧光传感器。通过加入1个当量的F的-中,强烈增加的荧光发射中心在385所纳米处出现的荧光发射为代价2在474纳米为中