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Issue 30, 2019

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

Supplementary files

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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