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Issue 76, 2018
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Switching from positive to negative axial thermal expansion in two organic crystalline compounds with similar packing

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Abstract

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

Graphical abstract: Switching from positive to negative axial thermal expansion in two organic crystalline compounds with similar packing

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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., 2018,54, 10675-10678
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    Switching from positive to negative axial thermal expansion in two organic crystalline compounds with similar packing

    L. Negi, A. Shrivastava and D. Das, Chem. Commun., 2018, 54, 10675
    DOI: 10.1039/C8CC05859H

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