Charge-transfer salts of methylferrocenes with DCNQI derivatives (DCNQI = N,N′-dicyano-1,4-benzoquinonediimine): Crystal structures and magnetic properties

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Abstract

Organometallic charge-transfer salts composed of decamethyl-, octamethyl-, and dimethylferrocene with N,N′-dicyano-1,4-benzoquinonediimine (DCNQI) derivatives were prepared. [Fe(C5Me5)2][(MeO) 2DCNQI] (1) and [Fe(C5Me4H)2] [Me2DCNQI] (2) were 1:1 DA salts with mixed-stack structures, whereas [Fe(C5Me4H)2][(MeO)2DCNQI] 2 (3) and [Fe(C5MeH4)2][DCNQI] 2 (4) were 1:2 DA salts. 3 exhibited a segregated-stack structure, in which charge separation was observed in the acceptor column. 1 became a metamagnet below TN = 5.0 K, whereas the other salts were paramagnets. Valence states and charge-transfer (CT) transitions in these complexes are discussed based on the neutral-ionic (NI) phase diagram. © 2011 Elsevier B.V. All rights reserved.

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Funasako, Y., Mochida, T., Sakurai, T., & Ohta, H. (2011). Charge-transfer salts of methylferrocenes with DCNQI derivatives (DCNQI = N,N′-dicyano-1,4-benzoquinonediimine): Crystal structures and magnetic properties. Journal of Organometallic Chemistry, 696(13), 2621–2626. https://doi.org/10.1016/j.jorganchem.2011.04.003

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