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Switching from Positive to Negative Axial Thermal Expansion in Two Organic Crystalline Compounds of Similar Packing

Abstract

Switching from positive to negative axial thermal expasion in pure organic materials is reported for the first time. The rare phenomenon has been rationalized based on packing of molecules in crystal structures and tranverse thermal vibration of atoms in the molecule. Unique packing of the molecules in the crystal structure contributes to the restricted movement of molecules along c axis. Subsequently, contraction of molecular dimension with increasing temperature due to transverse vibration of some atoms assists to switch from Positive Thermal Expansion (PTE) to Negative Thermal Expansion (NTE).

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Publication details

The article was received on 19 Jul 2018, accepted on 10 Aug 2018 and first published on 10 Aug 2018


Article type: Communication
DOI: 10.1039/C8CC05859H
Citation: Chem. Commun., 2018, Accepted Manuscript
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    Switching from Positive to Negative Axial Thermal Expansion in Two Organic Crystalline Compounds of Similar Packing

    L. Negi, A. Shrivastava and D. Das, Chem. Commun., 2018, Accepted Manuscript , DOI: 10.1039/C8CC05859H

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