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American Chemical Society, Journal of the American Chemical Society, 33(136), p. 11614-11617, 2014

DOI: 10.1021/ja506803y

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Striking Effect of Intra- versus Intermolecular Hydrogen Bonding on Zwitterions: Physical and Electronic Properties

Journal article published in 2014 by Yonghao Zheng, Mao-Sheng Miao, Yuan Zhang, Thuc-Quyen Nguyen, Fred Wudl
This paper is available in a repository.
This paper is available in a repository.

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Abstract

We report the synthesis, characterization, and application of novel zwitterions. The zwitterionic structures consist of a positively charged cyanine and negatively charged dienolate moieties, confirmed by experimental observations and theoretical calculations. Single crystal X-ray studies revealed that BIT-(NPh)2 is a coplanar molecule that forms 1-D chains via π-π interactions. In contrast, BIT-(NHexyl)2 is a twisted molecule with a dihedral angle of 78° between the charged planes. In charge transport studies, thin films of the flat zwitterion show semiconducting properties, with a hole mobility of 2.1 × 10(-4) cm(2) V(-1) s(-1) while the twisted zwitterion is a high resistivity insulator.