Arylazopyrazole Photoconversion Enables Tunable Morphology and Mechanical Properties

Small, Journal Year: 2025, Volume and Issue: 21(11)

Published: Feb. 3, 2025

Abstract A red‐light switchable fast, near‐quantitative two‐way photoswitching of an azoheteroarene, arylazo‐ N ‐phenyl‐3,5‐diphenyl pyrazole ( AAP1 ), with a high thermal half‐life the cis ‐isomer is reported here. The photochromic molecule switches in solution phase and even thin films. design incorporates structural features that enable → trans reversal under red light quantitatively. Solid‐state pristine films has been demonstrated using . Various photo patterns on paper as ink are generated their switching displaying change color investigated. Single‐crystal XRD structures well as, more exciting rarely observed form, obtained. SCXRD analysis reveals phenyl groups ring engage intramolecular π‐stacking interaction only which significantly enhances its stability. needle‐shaped crystals thermodynamically stable ‐ display exceptional elastic mechanical flexibility, whilst plate‐like ‐isomers brittle. quantitative difference properties both isomers exhibited by nanoindentation experiments. softer than ones roughly three‐fold characteristics identified.

Language: Английский

“Butterfly Effect” of Halogen Substitution on Phase Transition Features in One-Dimensional Spin-Peierls-type van der Waals Crystals

The Journal of Physical Chemistry C, Journal Year: 2024, Volume and Issue: 128(37), P. 15710 - 15717

Published: Sept. 10, 2024

Language: Английский

Photoswitching Characteristics, Photochromism and Mechanochromism of Extended π‐Conjugated Azopyrazole and Azoisoxazole Derivatives

ChemPhotoChem, Journal Year: 2024, Volume and Issue: unknown

Published: Nov. 18, 2024

Abstract Herein, we report extended π‐conjugated arylazopyrazole and arylazoisoxazole photoswitches towards tuning modulation of their intrinsic properties. In this regard, systematically introduced phenyl, styryl, (triphenylvinyl)styryl, phenylethynyl groups at ortho , meta para positions relative to the azo unit extend π‐conjugation vary electronic coupling. addition, heterocyclic substituents were also modified. Overall, 20 with modular have been synthesized studied for photoswitching ability thermal relaxations Z isomers in solution phase solid state. Besides deciphering importance extending conjugation characteristics, intriguing properties such as mechanochromism reversible bidirectional photochromism state unravelled. Through extensive spectroscopic studies, envisage effect coupling due its impact on longer wavelength light‐induced that holds several application potentials.

Language: Английский