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- Title
Metal‐like Ductility in Organic Plastic Crystals: Role of Molecular Shape and Dihydrogen Bonding Interactions in Aminoboranes.
- Authors
Mondal, Amit; Bhattacharya, Biswajit; Das, Susobhan; Bhunia, Surojit; Chowdhury, Rituparno; Dey, Somnath; Reddy, C. Malla
- Abstract
Ductility is a common phenomenon in many metals but is difficult to achieve in molecular crystals. Organic crystals bend plastically on one or two face‐specific directions but fracture when stressed in any other arbitrary directions. An exceptional metal‐like ductility and malleability in the isomorphous crystals of two globular molecules, BH3NMe3 and BF3NMe3, is reported, with characteristic tensile stretching, compression, twisting, and thinning. The mechanically deformed samples, which transition to lower symmetry phases, retain good long‐range order amenable to structure determination by single‐crystal X‐ray diffraction. Molecules in these high‐symmetry crystals interact through electrostatic forces (B−−N+) to form columnar structures with multiple slip planes and weak dispersive forces between columns. On the other hand, the limited number of facile slip planes and strong dihydrogen bonding in BH3NHMe2 negates ductility. Our study has implications for the design of soft ferroelectrics, solid electrolytes, barocalorics, and soft robotics.
- Subjects
PLASTIC crystals; DIHYDROGEN bonding; MOLECULAR shapes; DUCTILITY; SOFT robotics; MOLECULAR crystals
- Publication
Angewandte Chemie, 2020, Vol 132, Issue 27, p11064
- ISSN
0044-8249
- Publication type
Article
- DOI
10.1002/ange.202001060