Issue 12, 2014

Steric guided anomalous thermal expansion in a dimorphic organic system

Abstract

The thermal expansion behaviour of two polymorphs of 4,4′-methylenebis(2,6-dimethylaniline) (MBDA) has been studied. The monoclinic form exhibits a very large uniaxial negative thermal expansion (αl = −174(8) MK−1) and 1.6 times higher αv than the triclinic form, which exhibits a normal positive thermal expansion. This anomalous thermal expansion behaviour in the monoclinic form is guided by the steric effects of the strongly vibrating methyl groups in the solid.

Graphical abstract: Steric guided anomalous thermal expansion in a dimorphic organic system

Supplementary files

Article information

Article type
Communication
Submitted
16 Sep 2013
Accepted
28 Dec 2013
First published
06 Jan 2014

CrystEngComm, 2014,16, 2340-2343

Steric guided anomalous thermal expansion in a dimorphic organic system

S. Bhattacharya and B. K. Saha, CrystEngComm, 2014, 16, 2340 DOI: 10.1039/C3CE41869C

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