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Photomagnetic Response in Highly Conductive Iron(II) Spin‐Crossover Complexes with TCNQ Radicals
Author(s) -
Phan Hoa,
Benjamin Shermane M.,
Steven Eden,
Brooks James S.,
Shatruk Michael
Publication year - 2015
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201408680
Subject(s) - tetracyanoquinodimethane , spin crossover , conductivity , cationic polymerization , semiconductor , chemistry , bistability , crystallography , ion , amine gas treating , radical , band gap , materials science , photochemistry , polymer chemistry , molecule , organic chemistry , optoelectronics
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=ClO 4 − or BF 4 − ; 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.