Shape Rememorization of an Organosuperelastic Crystal through Superelasticity–Ferroelasticity Interconversion

As altering permanent shapes without loss of material function is of practical importance for material molding, especially for elastic materials, shape‐rememorization ability would enhance the utility of elastic crystalline materials. Since diffusionless plastic deformability can preserve the crystallinity of materials, the interconversion of diffusionless mechanical deformability between superelasticity and ferroelasticity could enable shape rememorization of superelastic single crystals. This study demonstrates the shape rememorization of an organosuperelastic single crystal of 1,4‐dicyanobenzene through time‐reversible interconversion of superelasticity–ferroelasticity relaxation by holding the mechanically twinned crystal without heating. The shape‐rememorization ability of the organosuperelastic crystal indicates the compatibility of superelasticity (antiferroelasticity) and ferroelasticity as well as the intrinsic workability of organic crystalline materials capable of recovering their crystal functions under mild conditions. In recent memory… The permanent shape of a mechanically twinned 1,4‐dicyanobenzene crystal was rememorized through superelasticity (SE)/ferroelasticity (FE) interconversion when the crystal was bent and held in the new shape without heating (see picture). The shape‐rememorization ability of the organosuperelastic crystal indicates the intrinsic workability of organic crystalline materials capable of recovering their crystal functions under mild conditions.