Effect of Crystal Packing on the Thermosalient Effect of the Pincer‐Type Diester Naphthalene‐2, 3‐diyl‐bis(4‐fluorobenzoate): A New Class II Thermosalient Solid. Issue 16 (19th February 2018)

• Record Type: Journal Article
• Authors: Tamboli, Majid I.; Karothu, Durga Prasad; Shashidhar, Mysore S.; Gonnade, Rajesh G.; Naumov, Panče
• Is Part Of: Chemistry. Volume 24:Issue 16(2018)
• Page Start: 4133
• Page End: 4139
• Publication Date: 2018-02-19
• Subjects: diesters -- jumping crystals -- phase transitions -- polymorphism -- thermosalient effect; Chemistry -- Periodicals; 540
• DOI: 10.1002/chem.201705586
• Languages: English
• ISSNs: 0947-6539

Abstract

Abstract: 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. Abstract : In top form : Form I of pentamorphic naphthalene‐2, 3‐diyl‐bis(4‐fluorobenzoate) (2 ) undergoes a reversible phase transition to form IV followed by a thermosalient effect, whereby the crystals jump or burst. The effect is due to reversible closing and opening of the arms of the diester molecules in a tweezer‐like action. Form III also undergoes a reversible phase transition; however, it is not thermosalient. Form II is a disappearing polymorph.