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Semi-conducting mixed-valent X4TCNQI−/II− (X = H, F) charge-transfer complexes with C6H2(NH2)4

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Abstract

We report further characterisation on the previously described [C6H2(NH2)4][TCNQ] charge-transfer (CT) complex. An in-depth analysis of the crystallographic data aided by spectroscopic methods indicates the compound is mixed-valent with TCNQI−/II− species. The analogous F4TCNQ CT complex has been synthesised and spectroscopic methods suggest that [C6H2(NH2)4][F4TCNQ] is also mixed-valent. Electrical conductivity measurements on both complexes indicate semi-conductor behaviour, with [C6H2(NH2)4][TCNQ] exhibiting a σ300K = 9.8 × 10−4 S cm−1 and an Ea = 0.10(1) eV. Density functional theory studies on both CT complexes reveal band structures suggestive of ambipolar transport, with a super-exchange mechanism.

Graphical abstract: Semi-conducting mixed-valent X4TCNQI−/II− (X = H, F) charge-transfer complexes with C6H2(NH2)4

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Article information


Submitted
28 Apr 2020
Accepted
15 Jun 2020
First published
23 Jun 2020

J. Mater. Chem. C, 2020, Advance Article
Article type
Paper

Semi-conducting mixed-valent X4TCNQI−/II− (X = H, F) charge-transfer complexes with C6H2(NH2)4

A. L. Sutton, B. F. Abrahams, D. M. D’Alessandro, L. Goerigk, T. A. Hudson, R. Robson and P. M. Usov, J. Mater. Chem. C, 2020, Advance Article , DOI: 10.1039/D0TC02069A

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