Effect of Cation-π Interaction on Macroionic Self-Assembly

被引：53

作者：

Luo, Jiancheng ^{[1
]}

Chen, Kun ^{[2
]}

Yin, Panchao ^{[1
]}

Li, Tao ^{[3
,4
]}

Wan, Gang ^{[5
]}

Zhang, Jin ^{[2
]}

Ye, Songtao ^{[1
]}

Bi, Xiaoman ^{[6
]}

Pang, Yi ^{[6
]}

Wei, Yongge ^{[2
]}

Liu, Tianbo ^{[1
]}

机构：

[1] Univ Akron, Dept Polymer Sci, Akron, OH 44325 USA

[2] Tsinghua Univ, Dept Chem, Beijing 100084, Peoples R China

[3] Argonne Natl Lab, Adv Photon Source, Xray Sci Div, Argonne, IL 60439 USA

[4] Northern Illinois Univ, Dept Chem & Biochem, De Kalb, IL 60115 USA

[5] Argonne Natl Lab, Div Mat Sci, 9700 S Cass Ave, Argonne, IL 60439 USA

[6] Univ Akron, Dept Chem, Akron, OH 44325 USA

来源：

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION | 2018年 / 57卷 / 15期

基金：

中国国家自然科学基金;

关键词：

binding affinity; cation-pi interaction; macroionic self-assembly; polyoxometalates; self-recognition; BIOLOGICAL RECOGNITION; SUPRAMOLECULAR COMPLEXES; SHAPED MACROIONS; ENZYME CATALYSIS; AROMATIC RINGS; BINDING; COOPERATIVITY; CONDENSATION; CHROMODOMAIN; DIVERSITY;

D O I：

10.1002/anie.201800409

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

A series of rod-shaped polyoxometalates (POMs) [Bu4N](7)[Mo6O18NC(CH2O)(3)MnMo6O18(OCH2)(3)CNMo6O18] and [Bu4N](7)[ArNMo6O17NC(CH2O)(3)MnMo6O18(OCH2)(3)CNMo6O17NAr] (Ar=2,6-dimethylphenyl, naphthyl and 1-methylnaphthyl) were chosen to study the effects of cation- interaction on macroionic self-assembly. Diffusion ordered spectroscopy (DOSY) and isothermal titration calorimetry (ITC) techniques show that the binding affinity between the POMs and Zn2+ ions is enhanced significantly after grafting aromatic groups onto the clusters, leading to the effective replacement of tetrabutylammonium counterions (TBAs) upon the addition of ZnCl2. The incorporation of aromatic groups results in the significant contribution of cation- interaction to the self-assembly, as confirmed by the opposite trend of assembly size vs. ionic strength when compared with those without aromatic groups. The small difference between two aromatic groups toward the Zn2+ ions is amplified after combining with the clusters, which consequently triggers the self-recognition behavior between two highly similar macroanions.

引用

页码：4067 / 4072

页数：6

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