Journal
JOURNAL OF CHEMICAL THERMODYNAMICS
Volume 39, Issue 10, Pages 1392-1398Publisher
ACADEMIC PRESS LTD ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jct.2007.03.005
Keywords
alkane-alpha,omega-dinitriles; differential scanning calorimetry; fusion; odd-even effect; solid-to-solid transitions
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Fusion and solid-to-solid transitions of a homologous series of 11 alkane-alpha,omega-dinitriles NC-(CH2)(n)- CN, where n = (1 to 10 and 12), were investigated by differential scanning calorimetry (d.s.c.). The temperatures of fusion increased as a function of the number of carbon atoms in the alkyl chains and showed a marked odd-even effect with even terms displaying higher values. Molar and massic enthalpies and entropies of fusion also showed odd-even alternation. Solid-to-solid transitions were detected for all compounds, except dodecanedinitrile. Comparison was made with the literature values for temperatures, enthalpies, and entropies of fusion of linear alkanes and alkane-alpha,omega-diamines. (c) 2007 Elsevier Ltd. All rights reserved.
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