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Electronic structures and spectroscopic regularities of phenylene-modified SWCNTs

Xinwei Huang, Zhengyuan Tu, Zipeng Ma, and Shi Wu

Department of Chemistry, Zhejiang University, Hangzhou, 310027 China

 

E-mail: wushi@zju.edu.cn

Abstract: The equilibrium geometries and electronic structures for a series of single-wall carbon nanotubes (SWCNTs) modified with phenylene were studied using the density functional theory (DFT) at the B3LYP/6-31G(d) level. Of the four configurations of the phenylene-modified SWCNTs, the v-configuration in which the bond is perpendicular to the main axis of the SWCNT is the most thermodynamically stable. The increase in radii of the modified SWCNTs generally leads to a decrease in the energy gaps. The first absorptions in the electronic spectra of the modified SWCNTs compared with those in the electronic spectra of pristine SWCNTs are basically red-shifted. The chemical shifts of bridged carbon atoms connected with phenylene in the v-configuration are shifted downfield relative to those of the pristine SWCNTs. The aromaticity of the rings in SWCNTs is improved owing to the addition of phenylene.

Keywords: modified SWCNTs – energy gap – red-shift – chemical shift – aromaticity

Full paper is available at www.springerlink.com.

DOI: 10.2478/s11696-011-0017-2

 

Chemical Papers 65 (3) 324–331 (2011)

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