Macroscopic crystalline deformation in an organic dye during reversible phase transition caused by alkyl disorder

Abstract

Single crystals of a bisazomethine dye exhibit thermally induced reversible crystalline deformation due to alkyl disorder.

Thermosalient effect of two polymorphs of a diketopyrrolopyrrole dye with different crystal systems and molecular arrangements

“…In several cases, thermosalient crystals having flexible substituents are related to the torsion of flexible substituents, and heating to the phase transition point causes the accumulation of strain in these flexible substituents. 17,35,36 Then, after sudden release of the accumulated strain, the structure returns to the most energetically stable conformation. However, unlike conventional thermosalient molecules that exhibit similar molecular conformation before and after a phase transition, PR3Y changed to PR3O with a significant difference Please do not adjust margins Please do not adjust margins in molecular conformation, molecular arrangement, and space group (from 1 � to P2 1 /c) ( Fig.…”

A large anisotropic plasticity of L-leucinium hydrogen maleate preserved at cryogenic temperatures

“…Mechanical properties of molecular crystals have long been known to have a pronounced effect on their transformations, including crystallization (Shtukenberg et al, 2014(Shtukenberg et al, , 2017Crist & Schultz, 2016;Li et al, 2018), polymorphic transformations (Mnyukh, 1963(Mnyukh, , 1979Kitaigorodskiy et al, 1965;Williams, 1973;Chupakhin et al, 1987;Herbstein, 2006;Matvienko et al, 2017;Minami et al, 2018;Zakharov et al, 2018) and solid-state chemical reactions (McBride, 1983;McBride et al, 1986;Luty & Fouret, 1989;Boldyrev, 1996;Boldyreva & Boldyrev, 1999;Luty et al, 2002;Larsen & Boydston, 2013;Nath et al, 2014Nath et al, , 2015Naumov et al, 2015;Commins et al, 2016;Boldyrev, 2018;Chizhik, Matvienko & Sidelnikov, 2018;Hao et al, 2018;Rai et al, 2018;Zakharov & Boldyreva, 2019). In the last decade, increasing attention has been paid to the mechanical properties of organic crystals but not necessarily in relation to their response to light or temperature variation.…”

Quantifying alkyl chain disorder in crystalline models of lipid bilayers using Raman spectroscopy

“…Alkyl chain packing and disorder is of continued interest across a range of fields, including biology where disorder may have an impact on ligand recognition processes in lipid bilayers, self‐assembly of liquid‐crystal materials, crystal engineering, and packing density in multilamellar liposomes . Understanding structural chemistry of biological membrane lipid bilayers is challenged by the difficulty of crystallising such systems, and there is an ongoing demand for spectroscopic approaches, such as solution nuclear magnetic resonance (NMR) and vibrational spectroscopy, for studying bilayer systems that are difficult or impossible to crystallise.…”