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A cobalt(ii) spin-crossover compound with partially charged TCNQ radicals and an anomalous conducting behavior

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Abstract

The bifunctional salt [Co(terpy)2](TCNQ)3·CH3CN (terpy = 2,2′;6′,2′′-terpyridine, TCNQ = 7,7,8,8-tetracyanoquino-dimethane) exhibits a high room temperature conductivity of 0.13 S cm−1 and an anomaly in conductivity at ∼190 K as evidenced by variable temperature structural, magnetic and conductivity studies. The anomaly in the conductivity at 190 K has been correlated with the temperature dependent structural breathing and Jahn–Teller distortion of the low spin state of the SCO units, as well as the charge fluctuations and supramolecular π-stacking interactions of partially charged TCNQ radicals. The modular synthetic approach leads to an accessible source of partially charged TCNQ radicals for the facile preparation of bifunctional molecular materials with high electrical conductivity.

Graphical abstract: A cobalt(ii) spin-crossover compound with partially charged TCNQ radicals and an anomalous conducting behavior

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Supplementary files

Article information


Submitted
19 Sep 2015
Accepted
10 Nov 2015
First published
08 Dec 2015

This article is Open Access
All publication charges for this article have been paid for by the Royal Society of Chemistry

Chem. Sci., 2016,7, 1569-1574
Article type
Edge Article
Author version available

A cobalt(II) spin-crossover compound with partially charged TCNQ radicals and an anomalous conducting behavior

X. Zhang, Z. Wang, H. Xie, M. Li, T. J. Woods and K. R. Dunbar, Chem. Sci., 2016, 7, 1569
DOI: 10.1039/C5SC03547C

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