Cation3蟺: Cooperative Interaction of a Cation and Three Benzenes with an Anomalous Order in Binding Energy
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- 作者：Manyi Duan ; Bo Song ; Guosheng Shi ; Haikuo Li ; Guangfu Ji ; Jun Hu ; Xiangrong Chen ; Haiping Fang
- 刊名：The Journal of the American Chemical Society
- 出版年：2012
- 出版时间：July 25, 2012
- 年：2012
- 卷：134
- 期：29
- 页码：12104-12109
- 全文大小：332K
- 年卷期：v.134,no.29(July 25, 2012)
- ISSN：1520-5126
文摘
Cation鈭捪€ or cation鈭捪€鈥撓€ interaction between one cation and one or two structures bearing rich 蟺-electrons (such as benzene, aromatic rings, graphene, and carbon nanotubes) plays a ubiquitous role in various areas. Here, we analyzed a new type interaction, cation3蟺, whereby one cation simultaneously binds with three separate 蟺-electron-rich structures. Surprisingly, we found an anomalous increase in the order of the one-benzene binding strength of the cation3蟺 interaction, with K+ > Na+ > Li+. This was at odds with the conventional ranking of the binding strength which usually increases as the radii of the cations decrease. The key to the present unexpected observations was the cooperative interaction of the cation with the three benzenes and also between the three benzenes, in which a steric-exclusion effect between the three benzenes played an important role. Moreover, the binding energy of cation3蟺 was comparable to cation2蟺 for K+ and Na+, showing the particular importance of cation3蟺 interaction in biological systems.