Crystal Engineering of a Hydrazone Molecule toward High Elasticity and Bright Luminescence

Abstract

Flexible luminescent crystals have attracted increasing attention on account of the potential application value in optical material fields. How to design crystals with high elasticity and bright luminescence is an urgent duty that material researchers want to effectuate. Crystal engineering could achieve different crystal materials with various functions based on one molecular structure. Therefore, crystal engineering provides a potential strategy to improve the properties of flexible crystals. In this paper, we gave a pioneer work to improve the properties of flexible luminescent crystals by designing on crystal structure. By disclosing the relationship of structure–property, our work extracted the advantages (elasticity or bright emission) of two inferior crystals and obtained three elastic bending crystals with outstanding emission behaviors. Notably, our work not only achieves the fabrication of flexible crystals based on crystal engineering aspect but also provides good candidates for flexible optical waveguiding materials.

Diverse Mechanical Properties of 1,3-Bis(4-nitrophenyl) thiourea–DMSO Dimorphic Solvates

“…The synergetic effect of different intermolecular interactions among solute and solvent molecules in the crystal lattice help in rationalizing the type of responses exhibited by the crystals on mechanical deformation. , The reversible mechanical compliance, i.e., elastic bending, comes under the category of different responses exhibited by crystals on mechanical deformation. ,− To accommodate the stress experienced by molecules on the subjugation of force, the most affected microscopic sites are the ones that are relatively easily perturbed, i.e., in most cases, the ones that are held together by weak interactions. For this purpose, the contribution from individual components of the interaction energy could provide significant insights into the different hypotheses proposed for bending in molecular crystals. − ,, Primarily, rigid π-conjugated systems ,, have been observed to undergo molecular perturbation via rotation, , expansion–compression in an outer-inner arc which may or may not cause changes in intermolecular distances ,, of a bent crystal, respectively, but the possibility of conformational adjustment has not been considered a possible prospect, perhaps due to unavailability of suitable systems providing conformational flexibility and the absence of adequate instrumentation facilities.…”

Tuning the mechanical flexibility of organic molecular crystals by polymorphism for flexible optical waveguides

“…41 More examples of tuning the mechanical response of molecular crystals through polymorph screening have been since reported. [42][43][44][45][46] The polymorphism of molecular crystals which show simultaneously mechanical flexibility and useful optical properties is rare. Single crystals of π-conjugated organic chromophores are frequently used as active micro-optical components such as optical waveguides, 47 lasers, 48 circuits, 49 and field-effect transistors 50 in designing advanced optoelectronic devices.…”

Elastic Organic Crystals Based on Barbituric Derivative: Multi‐faceted Bending and Flexible Optical Waveguide

“…[25] From then on, elastic crystals exhibited good light transmission performance, laying the foundation for their applications in optical waveguide materials. [26][27][28][29][30][31][32][33][34][35][36][37][38] However, the elastic crystals with optical waveguide properties were still rare.…”

“…developed the fluorescent and elastic crystals of from ( E )‐1‐(4‐(dimethylamino)phenyl)iminomethyl‐2‐hydroxyl‐naphthalene.The optical waveguide properties of flexible crystals were explored for the first time, which endowed the elastic crystals with optical/optoelectronic functions [25] . From then on, elastic crystals exhibited good light transmission performance, laying the foundation for their applications in optical waveguide materials [26–38] . However, the elastic crystals with optical waveguide properties were still rare.…”