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The pre-melt phase of n-alkanes: Crystallographic evidence for a kinked chain structure
D L Dorset1, B Moss, J C Wittmann
1Medical Foundation of Buffalo, Inc., 73 High Street, Buffalo, NY 14203.
Abstract:
Electron diffraction measurements on epitaxially grown crystals of orthorhombic n-hexatriacontane, n-C(36)H(74), give evidence for the chain-defect mechanism for linear chain melting. The derived structural model is also in accord with recent spectroscopic studies of odd-chain n-alkanes, and the diffraction data specifically exclude models based on helices or rigid chain rotors. Stability of a kinked chain structure, moreover, is indicated by an observed hysteresis effect that gives different pretransition temperatures for solution-grown and annealed crystals.
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