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Geometry‐Induced Oligomerization of Fluorine‐Substituted Phenylazothiazole Photoswitches by P. K. Hashim; Saugata Sahu; Kiyonori Takahashi; Shakkeeb Thazhathethil; Takayoshi Nakamura; Nobuyuki Tamaoki is a Chemistry article available to read on EtoBox.

What is Geometry‐Induced Oligomerization of Fluorine‐Substituted Phenylazothiazole Photoswitches about?

## Abstract Photoswitches are molecules that can absorb light of specific wavelengths and undergo a reversible transformation between their __trans__ and __cis__ isomeric forms. In phenylazo photoswitches, it is common for the less stable __cis__ (__Z__) isomer to convert back to the more stable __trans__ (__E__) isomer either through photochemical or thermal means. In this research, we designed new derivatives of phenylazothiazole (PAT) photoswitches, PAT‐F~n~, which feature fluorine substituents on their phenyl component. These derivatives can reversibly isomerize under visible light exposure with the enrichment of __E__ and __Z__ isomers at photostationary state (PSS). Surprisingly, we observed an unconventional phenomenon when these PAT‐F~n~ (n**≧**2) photoswitches were in their __cis__ isomeric state in the absence of light. Instead of the anticipated transformation from __cis__ to __trans__ isomer, these compounds converted to an oligomeric compound. Our detailed experimental investigation and theoretical calculations, indicated the crucial role of fluorine substituents and the distinctive geometric arrangement of the __cis__ isomer in driving the unexpected oligomerization p

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Author

P. K. Hashim; Saugata Sahu; Kiyonori Takahashi; Shakkeeb Thazhathethil; Takayoshi Nakamura; Nobuyuki Tamaoki

Publisher

Wiley

Published

2024

Language

EN

Field

Chemistry (Physical Sciences)