Mechanical twinning in organic crystals

Abstract

Mechanical twinning which enables crystalline solids to deform reversibly beyond their elastic limit has been getting much attention in recent progressive studies on flexible organic crystals. In addition to the...

Stress and light sensitive dual-mechanical property of acylhydrazone crystal

“…Crystals may exhibit several mechanical macroscopic properties when exposed to stimuli, such as stress, 1-3 light, [4][5][6] heat, [7][8][9] and humidity. 10,11 Stress-induced mechanical properties of molecular crystals can be of different types based on the packing arrangement, such as elasticity, [12][13][14][15] plasticity, [16][17][18] twinning, 19,20 and helical twisting. 21,22 In photosalient and thermosalient crystals, molecular rearrangement triggered by light and heat can induce distinct mechanical responses.…”

Stress‐Induced Inversion of Linear Dichroism by 4,4′‐Bipyridine Rotation in a Superelastic Organic Single Crystal

“…The interconvertible SE‐FE shape change implies a twinning mechanism of the diffusionless transformation [23, 27, 28] . Therefore, we performed the SC‐XRD analyses on both completely and partially deformed single crystals.…”

“…[27,51,52] The interconvertible SE-FE shape change implies a twinning mechanism of the diffusionless transformation. [23,27,28] Therefore, we performed the SC-XRD analyses on both completely and partially deformed single crystals. As listed in Table S1, no substantial variation was found in the unit-cell parameters of these single crystals, which verifies the mechanical twinning of the single crystal during the SE transformation.…”

Stress‐Induced Inversion of Linear Dichroism by 4,4′‐Bipyridine Rotation in a Superelastic Organic Single Crystal

“…Since the discovery of SE in an organic crystal of terephthalamide by Takamizawa and co‐workers in 2014, [12] several molecular SE or FE crystals, [3, 23, 24] including 3,5‐difluorobenzoic acid (SE), [25] 5‐chloro‐2‐nitroaniline (FE), [26] 1,4‐dicyanobenzene (SE+FE), [27] and bis(triisopropylsilylethynyl)‐pentacene (SE+FE), [28] have been reported. However, rationally developing the SE or FE single crystal remains a major challenge in the field.…”

“…Hence, the molecular SE or FE single crystals not only present novel mechanical materials but also provide unique chances to investigate advanced mechanically tunable photoelectric properties. [19][20][21][22] Since the discovery of SE in an organic crystal of terephthalamide by Takamizawa and co-workers in 2014, [12] several molecular SE or FE crystals, [3,23,24] including 3,5difluorobenzoic acid (SE), [25] 5-chloro-2-nitroaniline (FE), [26] 1,4-dicyanobenzene (SE + FE), [27] and bis(triisopropylsilylethynyl)-pentacene (SE + FE), [28] have been reported. However, rationally developing the SE or FE single crystal remains a major challenge in the field.…”