Volume 20, Issue 7 pp. 448-453
Research Article

Cation sitting in aromatic cages: ab initio computational studies on tetramethylammonium–(benzene)n (n=3–4) complexes

Jiagao Cheng

Jiagao Cheng

School of Science, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China

Drug Discovery and Design Center, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zuchongzhi Road, Shanghai 201203, China

School of Pharmacy, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China

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Zhen Gong

Zhen Gong

Drug Discovery and Design Center, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zuchongzhi Road, Shanghai 201203, China

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Weiliang Zhu

Corresponding Author

Weiliang Zhu

School of Science, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China

Drug Discovery and Design Center, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zuchongzhi Road, Shanghai 201203, China

Drug Discovery and Design Center, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zuchongzhi Road, Shanghai 201203, China.===Search for more papers by this author
Yun Tang

Yun Tang

School of Pharmacy, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China

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Weihua Li

Weihua Li

School of Pharmacy, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China

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Zhong Li

Zhong Li

School of Pharmacy, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China

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Hualiang Jiang

Corresponding Author

Hualiang Jiang

Drug Discovery and Design Center, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zuchongzhi Road, Shanghai 201203, China

School of Pharmacy, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China

Drug Discovery and Design Center, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zuchongzhi Road, Shanghai 201203, China.===Search for more papers by this author
First published: 17 April 2007
Citations: 7

Abstract

Quantum chemistry study was performed on interaction between tetramethylammonium (TMA) and aromatic cages by means of the MP2 method to show how TMA sits in an aromatic cage that is composed of benzenes. The MP2 calculations on TMA–(benzene)n complexes demonstrate that the more the benzene molecules in the aromatic cage, the stronger the binding strength between the cage and TMA. In details, the structure of TMA–(benzene)n (n = 1–4) complexes can be easily constructed by superimposing n TMA-benzene complexes via TMA, and the binding energies of the TMA–(benzene)n complexes are the sum of the n corresponding TMA-benzene systems. For instance, the distances between the N of TMA and the plane of the benzene ring are 4.238, 4.252, 4.264 ,and 4.276 Å, respectively, for TMA–(benzene)n (n = 1–4) complexes, and the BSSE corrected binding energies at MP2/6-311++G** level are −8.8, −17.3, −25.8 and −34.3 kcal/mol, respectively, for TMA– (benzene)n (n = 1–4) complexes. Thus, this study provides us useful information on how a cation interacts with an aromatic cage in terms of complex geometry and binding strength. Copyright © 2007 John Wiley & Sons, Ltd.

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