MEM(TCNQ)2 at room temperature and 10 K, and the absence of a spin-Peierls transition.
Precise X-ray determinations of the crystal structure of the 1:2 complex of N-ethyl-N-methylmorpholinium and 7,7,8,8-tetracyano-p-quinodimethanide, abbreviated as MEM-TCNQ or MEM(TCNQ)(2) (C(7)H(16)NO(+).2C(12)H(4)N(4)(0.5-)), have been performed at 293 and at 10 K. Evidence for the expected spin-Peierls transition at 19 K is not found, and this may follow from radiation damage to the crystal or from insufficient equipment sensitivity.
Figgis
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Chemistry Department, University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia. bnf@crystal.uwa.edu.au
Sobolev
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Kepert
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CJ
Kurmoo
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M