Spatially resolved analysis of short-range structure perturbations in a plastically bent molecular crystal

Manas K. Panda, Soumyajit Ghosh, Nobuhiro Yasuda, Taro Moriwaki, Goutam Dev Mukherjee, C. Malla Reddy, Pance Naumov

Research output: Contribution to journalArticle

Abstract

The exceptional mechanical flexibility observed with certain organic crystals defies the common perception of single crystals as brittle objects. Here, we describe the morphostructural consequences of plastic deformation in crystals of hexachlorobenzene that can be bent mechanically at multiple locations to 360° with retention of macroscopic integrity. This extraordinary plasticity proceeds by segregation of the bent section into flexible layers that slide on top of each other, thereby generating domains with slightly different lattice orientations. Microscopic, spectroscopic and diffraction analyses of the bent crystal showed that the preservation of crystal integrity when stress is applied on the (001) face requires sliding of layers by breaking and re-formation of halogen-halogen interactions. Application of stress on the (100) face, in the direction where · interactions dominate the packing, leads to immediate crystal disintegration. Within a broader perspective, this study highlights the yet unrecognized extraordinary malleability of molecular crystals with strongly anisotropic supramolecular interactions.

Original languageEnglish (US)
Pages (from-to)65-72
Number of pages8
JournalNature chemistry
Volume7
Issue number1
DOIs
StatePublished - Jan 1 2015

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

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