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- Title
Dynamic Odd-Even Effect in Liquid n-Alkanes near Their Melting Points.
- Authors
Yang, Ke; Cai, Zhikun; Jaiswal, Abhishek; Tyagi, Madhusudan; Moore, Jeffrey S.; Zhang, Yang
- Abstract
n-Alkanes are the textbook examples of the odd-even effect: The difference in the periodic packing of odd- and even-numbered n-alkane solids results in odd-even variation of their melting points. However, in the liquid state, in which this packing difference is not obvious, it seems natural to assume that the odd-even effect does not exist, as supported by the monotonic dependence of the boiling points of n-alkanes on the chain length. Herein, we report a surprising odd-even effect in the translational diffusional dynamic properties of n-alkanes in their liquid states. To measure the dynamics of the molecules, we performed quasi-elastic neutron scattering measurements near their melting points. We found that odd-numbered n-alkanes exhibit up to 30 times slower dynamics than even-numbered n-alkanes near their respective melting points. Our results suggest that, although n-alkanes are the simplest hydrocarbons, their dynamic properties are extremely sensitive to the number of carbon atoms.
- Subjects
ALKANES; MELTING points; QUASIELASTIC neutron scattering; HYDROCARBONS; SUBLIMATION (Chemistry); ENTHALPY; SOLUBILITY
- Publication
Angewandte Chemie International Edition, 2016, Vol 55, Issue 45, p14090
- ISSN
1433-7851
- Publication type
Article
- DOI
10.1002/anie.201607316