Photomagnetic response in highly conductive iron(II) spin-crossover complexes with TCNQ radicals

Hoa Phan; Shermane M Benjamin; Eden Steven; James S Brooks; Michael Shatruk

doi:10.1002/anie.201408680

Photomagnetic response in highly conductive iron(II) spin-crossover complexes with TCNQ radicals

Angew Chem Int Ed Engl. 2015 Jan 12;54(3):823-7. doi: 10.1002/anie.201408680. Epub 2014 Nov 21.

Authors

Hoa Phan¹, Shermane M Benjamin, Eden Steven, James S Brooks, Michael Shatruk

Affiliation

¹ Department of Chemistry & Biochemistry, Florida State University, 95 Chieftan Way, Tallahassee, FL 32306 (USA) http://www.chem.fsu.edu/∼shatruk/

PMID: 25417937
DOI: 10.1002/anie.201408680

Abstract

Co-crystallization of a cationic Fe(II) complex with a partially charged TCNQ(.δ-) (7,7',8,8'-tetracyanoquinodimethane) radical anion has afforded molecular materials that behave as narrow band-gap semiconductors, [Fe(tpma)(xbim)](X)(TCNQ)(1.5)⋅DMF (X=ClO4(-) or BF4(-); tpma=tris(2-pyridylmethyl)amine, xbim=1,1'-(α,α'-o-xylyl)-2,2'-bisimidazole). Remarkably, these complexes also exhibit temperature-and light-driven spin crossover at the Fe(II) center, and are thus the first structurally defined magnetically bistable semiconductors assembled with the TCNQ(.δ-) radical anion. Transport measurements reveal the conductivity of 0.2 S cm(-1) at 300 K, with the low activation energy of 0.11 eV.

Keywords: TCNQ; conductivity; iron; semiconductors; spin crossover.