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Science 9 October 1981:
Vol. 214. no. 4517, pp. 188 - 190
DOI: 10.1126/science.214.4517.188
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Articles

Phase Transitions and Nonplanar Conformers in Crystalline n-Alkanes

ROBERT G. SNYDER 1, MARK MARONCELLI 1, SONG PING QI 1, and HERBERT L. STRAUSS 1

1 Department of Chemistry, University of California, Berkeley 94720

Crystals of n-alkanes show a remarkable series of solid-solid phase transitions. In the odd n-alkanes C25, C27, and C29 a previously unknown transition is found by both calorimetry and infrared spectroscopy. The ubiquitous presence of nonplanar conformations of the chains is shown by infrared spectroscopy. The nonplanar conformers constitute approximately half the molecules in the highest temperature solid phase of C29.

Submitted on May 22, 1981
Revised on July 28, 1981


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Science. ISSN 0036-8075 (print), 1095-9203 (online)