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Preparation and Characterization of Conducting Mixed-Valence 9,9′-Dimethyl-3,3′-bicarbazyl Rectangular Nanowires

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journal contribution
posted on 20.02.2016, 05:10 by Takuya Tokuda, Katsuyuki Murashiro, Minako Kubo, Hyuma Masu, Mamoru Imanari, Hiroko Seki, Nobuyuki Aoki, Yuichi Ochiai, Hirofumi Kanoh, Katsuyoshi Hoshino
The facile synthesis of an organic electric conducting nanowire is described. The simple oxidation of 9-methylcarbazole by iron­(III) perchlorate in a methanol/acetonitrile mixture under atmospheric pressure and temperature produces abundant nanowires without using a template. The nanowire consists of 9,9′-dimethyl-3,3′-dicarbazyl and has a rectangular nanowire shape with an average diameter of 397 ± 50 nm and length of 17 ± 5 μm. The results of the elemental analysis, 1H NMR, FT-IR, XPS, and ESR measurements revealed that the chemical composition of the nanowire is (dicarbazyl)0.12(dicarbazylium·ClO4)0.88·H2O. This result, combined with the UV–vis–NIR measurement, demonstrates that 9,9′-dimethyl-3,3′-dicarbazyl stacks in a mixed valence state. The nanowire is electroactive and has an electric conductivity of 3.0 × 10–5 S cm–1.