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Issue 30, 2019
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A possibly highly conducting state in an optically excited molecular crystal

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Abstract

Unique electronic states and properties of the molecular charge transfer salts have been a center of interest for decades. A new molecular charge transfer salt, BPY[Ni(dmit)2]6·3CH3CN (BPY2+ = N,N′-ethylene 2,2′-bipyridinium, dmit2− = 2-thioxo-1,3-dithiole-4,5-dithiolato), exhibits semiconducting properties governed by its [Ni(dmit)2] radical anions. This salt is an insulator but exhibits high conductance like a metallic substance. Structural, spectroscopic, and theoretical examinations reveal that the high conductance of the salt is based on a fluctuation in the charge distribution on the Ni(dmit)2 anions, which are closely and isotropically packed in a two-dimensional sheet owing to its Ni(dmit)2-rich stoichiometry (BPY : Ni(dmit)2 = 1 : 6). The qualitative conduction behavior is hardly affected by temperature and pressure unlike other organic charge transfer salts. However, UV irradiation (375 ± 5 nm), corresponding to a charge transfer between Ni(dmit)2 anions, perturbs the charge distribution to realize a highly conducting state based on our proposed analysis model.

Graphical abstract: A possibly highly conducting state in an optically excited molecular crystal

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Article information


Submitted
26 Jan 2019
Accepted
19 Jun 2019
First published
19 Jun 2019

J. Mater. Chem. C, 2019,7, 9175-9183
Article type
Paper

A possibly highly conducting state in an optically excited molecular crystal

T. Naito, T. Karasudani, R. Yamamoto, M. Y. Zhang and T. Yamamoto, J. Mater. Chem. C, 2019, 7, 9175
DOI: 10.1039/C9TC00491B

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