Mechanochemical synthesis of N-salicylidene-aniline: thermosalient effect of polymorphic crystals

IUCrJ
Sudhir MittapalliAshwini Nangia

Abstract

Polymorphs of the dichloro derivative of N-salicylideneaniline exhibit mechanical responses such as jumping (Forms I and III) and exploding (Form II) in its three polymorphs. The molecules are connected via the amide N-H⋯O dimer synthon and C-Cl⋯O halogen bond in the three crystal structures. A fourth high-temperature Form IV was confirmed by variable-temperature single-crystal X-ray diffraction at 180°C. The behaviour of jumping exhibited by the polymorphic crystals of Forms I and III is due to the layered sheet morphology and the transmission of thermal stress in a single direction, compared with the corrugated sheet structure of Form II such that heat dissipation is more isotropic causing blasting. The role of weak C-Cl⋯O interactions in the thermal response of molecular crystals is discussed.

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Citations

May 18, 2017·IUCrJ·Maximilian J Werny, Jagadese J Vittal
Jan 14, 2020·Advanced Materials·Durga Prasad KarothuPanče Naumov
Apr 1, 2019·Acta Crystallographica Section B, Structural Science, Crystal Engineering and Materials·Pablo GaztañagaDaniel R Vega
Jan 22, 2021·Journal of the American Chemical Society·Bibhuti Bhusan RathJagadese J Vittal
Aug 7, 2021·Chemistry, an Asian Journal·Samim KhanMohammad Hedayetullah Mir

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Methods Mentioned

BETA
X-ray

Software Mentioned

STAR
Xpac
SADABS
APEX
SHELX
PLATON
OLEX
Seed

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