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The landscape of mechanical properties of molecular crystals

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Abstract

An analysis of compiled literature nanoindentation hardness (Hc) and elastic modulus (E) values of molecular crystals revealed a wide range of mechanical properties (0.001–1.80 GPa for Hc and 0.27–46.8 GPa for E). A global approximately linear relationship between E and Hc is observed and possible reasons for deviation from the line are discussed. A classification scheme for molecular crystals based on E and Hc is proposed. In addition, results suggest that the effectiveness of crystal engineering strategies in modifying both E and Hc follows the order cocrystallization/salt formation > polymorph formation > anisotropy. A clear understanding of the E and Hc landscape lays a foundation for effective optimization of the mechanical properties of molecular crystals through crystal engineering.

Graphical abstract: The landscape of mechanical properties of molecular crystals

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Article information


Submitted
27 Nov 2019
Accepted
27 Dec 2019
First published
01 Jan 2020

CrystEngComm, 2020, Advance Article
Article type
Communication

The landscape of mechanical properties of molecular crystals

C. Wang and C. C. Sun, CrystEngComm, 2020, Advance Article , DOI: 10.1039/C9CE01874C

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