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

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 ?-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.

SUBMITTER: Zhang X

PROVIDER: S-EPMC5530863 | biostudies-other | 2016 Feb

REPOSITORIES: biostudies-other

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

Zhang Xuan X Wang Zhao-Xi ZX Xie Haomiao H Li Ming-Xing MX Woods Toby J TJ Dunbar Kim R KR

Chemical science 20151208 2

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 ...[more]

PMID: 28808532

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