1985
DOI: 10.1107/s0108768185002282
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The structure of the low-temperature modification of N,N-dimethylmorpholinium di-7,7,8,8-tetracyano-p-quinodimethanide; DMM(TCNQ)2 (Iα) at 95 K

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Cited by 4 publications
(6 citation statements)
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“…Qualitatively, this appears to us a slightly less ideal intermolecular packing with respect to the maximin principle. This is substantiated by the smaller number of structures (ten) which adopt the staggered-short axis arrangement. ,,,,,, This second arrangement, as it involves contacts between atoms all with large (although not the largest) HOMO presences, nonetheless seems a reasonable alternative.…”
Section: Resultsmentioning
confidence: 98%
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“…Qualitatively, this appears to us a slightly less ideal intermolecular packing with respect to the maximin principle. This is substantiated by the smaller number of structures (ten) which adopt the staggered-short axis arrangement. ,,,,,, This second arrangement, as it involves contacts between atoms all with large (although not the largest) HOMO presences, nonetheless seems a reasonable alternative.…”
Section: Resultsmentioning
confidence: 98%
“…In the CSD, reduced N-containing π-radicals with short C···C, C···N, or N···N contacts (contact distances < 0.95 the sum of the van der Waals radii, i.e., distances shorter than respectively 3.20, 3.09, and 2.95 Å) all prove to be nitriles. The five nitrile radicals uncovered (HCCP, , TCNQ, DCNQI, BTCQ, and TCNE 68-75 ) are shown in Figure . All these species are in an open-shell form, with an anionic charge between 0.5 and 1.…”
Section: Resultsmentioning
confidence: 99%
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“…At high temperatures (475 K), a transition is observed suggestive of a 4kF transition to uniform chains as in MEM TCNQ2. Below Tc = 260 K, the chains are tetramerized, indicative of a spinPeierls or 2kF transition (20). At temperatures below T,, two lines are observed in the esr spectrum which gradually merge at T,.…”
Section: Discussionmentioning
confidence: 95%