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Crystals 2012, 2(2), 662-668; doi:10.3390/cryst2020662

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

Graduate School of Material Science, University of Hyogo, 3-2-1 Kouto, Kamigori, Hyogo 678-1297, Japan
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Received: 16 March 2012 / Revised: 1 June 2012 / Accepted: 5 June 2012 / Published: 12 June 2012
(This article belongs to the Special Issue Molecular Conductors)
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Abstract

Three TCNQ derivatives carrying nitroxide radicals (3a3c) 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 CT complex; nitroxide; TCNQ; redox property; magnetic property; crystal structure
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This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Suzuki, H.; Akutsu, H.; Yamada, J.-I.; Nakatsuji, S. Single-Component Charge-Transfer Crystals Based on Spin-Carrying TCNQ (7,7,8,8-Tetracyanoquinodimethane) Derivatives. Crystals 2012, 2, 662-668.

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