Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 24, Issue 16, Pages 4133-4139Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201705586
Keywords
diesters; jumping crystals; phase transitions; polymorphism; thermosalient effect
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Funding
- CSIR, New Delhi
- New York University Abu Dhabi
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The pincer-like double ester naphthalene-2,3-diyl-bis(4-fluorobenzoate) (2) is pentamorphic. Upon heating crystals of form I to below their melting point (441-443 K), they undergo a phase transition accompanied by a thermosalient effect, that is, rare and visually striking motility whereby the crystals jump or disintegrate. The phase transition and the thermosalient effect are reversible. Analysis of the crystal structure revealed that form I is a class II thermosalient solid. Crystals of form III also underwent a reversible phase transition in the temperature range of 160 to 170 K; however, they were not thermosalient. Comparison of the structures and the mechanical responses of the two polymorphs revealed that the thermosalient effect of form I was due to reversible closing and opening of the arms of the diester molecules in a tweezer-like action.
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