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Entropy 2016, 18(12), 456; doi:10.3390/e18120456

A Possible Application of the Contribution of Aromaticity to Entropy: Thermal Switch

1
Laboratoire de Chimie Physique et Microbiologie Pour l’Environnement, CNRS UMR 7564/Universitée de Lorraine, 405 Rue de Vandoeuvre, 54601 Villers-lès-Nancy, France
2
Laboratoire de Chimie Physique Matière et Rayonnement, Sorbonne Universités, UPMC Univ Paris 06, UMR 7614, 11 rue P. et M. Curie, 75005 Paris, France
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Academic Editors: Milivoje M. Kostic and Philip Broadbridge
Received: 2 March 2016 / Revised: 25 October 2016 / Accepted: 26 October 2016 / Published: 20 December 2016
(This article belongs to the Section Thermodynamics)
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Abstract

It has been known for a long time that the loss of aromaticity of gaseous molecules leads to a large increase of the enthalpy and to a tiny increase of the entropy. Generally, the calculated transition temperature from an aromatic structure towards a non-aromatic structure at which these two contributions cancel is very high. The entropy associated to the loss of aromaticity of adsorbed molecules, such as pyridine on Si(100) and on Ge(100), is roughly the same while the associated enthalpy is much smaller, a consequence of which is a low transition temperature. This allows us to imagine monomolecular devices, such as thermal switches, based on the difference of electrical conductivity between aromatic and non-aromatic species adsorbed on Si(100) or on Ge(100). View Full-Text
Keywords: aromaticity; molecular electronics; thermal switch aromaticity; molecular electronics; thermal switch
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Coustel, R.; Carniato, S.; Boureau, G. A Possible Application of the Contribution of Aromaticity to Entropy: Thermal Switch. Entropy 2016, 18, 456.

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