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• Akutsu, H
• Yamada, J
• Nakatsuji, S
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• Akutsu, H
• Yamada, J
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Crystals 2012, 2(2), 662-668; doi:10.3390/cryst2020662

Article

Single-Component Charge-Transfer Crystals Based on Spin-Carrying TCNQ (7,7,8,8-Tetracyanoquinodimethane) Derivatives

Hideto Suzuki, Hiroki Akutsu, Jun-ichi Yamada and Shin’ichi Nakatsuji*

Graduate School of Material Science, University of Hyogo, 3-2-1 Kouto, Kamigori, Hyogo 678-1297, Japan

* Author to whom correspondence should be addressed.

Received: 16 March 2012; in revised form: 1 June 2012 / Accepted: 5 June 2012 / Published: 12 June 2012

(This article belongs to the Special Issue Molecular Conductors)

Download PDF Full-Text [329 KB, Updated Version, uploaded 14 June 2012 13:21 CEST]

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Abstract: Three TCNQ derivatives carrying nitroxide radicals (3a–3c) were prepared and were found to form single-component charge-transfer (CT) complexes by self-assembly, in which outer nitroxide groups of a couple of different molecules work as donors and the inner TCNQ unit of another molecule as an acceptor. While the CT interactions found for the TEMPO (2,2,6,6-tetramethylpiperidin-1-oxy) derivative 3a and the PROXYL (2,2,5,5-tetramethylpirrolidin-1-oxy) derivative 3b are point-to-face fashion between the oxygen atom of each nitroxide group and the six-membered ring of inner TCNQ unit, the CT interactions found for the PO (2,2,5,5-tetramethyl-3-pyrrolin-1-oxy) derivative 3c are point-to-point contacts between the oxygen atoms of outer nitroxide groups and the carbon atoms of a couple of cyano groups.

Keywords: CT complex; nitroxide; TCNQ; redox property; magnetic property; crystal structure

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