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submitted on 18.09.2020 and posted on 18.09.2020by grzegorz sobczak, Iwona Misztalewska-Turkowicz, Volodymyr Sashuk
The possibility of incorporating functional groups into molecular photoswitches is
a prerequisite for their versatility and broad-range applications. Herein we present the first
successful synthesis of DASA chromophores featuring a thiol group. The latter provides a
unique opportunity to investigate the photoswitching behavior of these visible-light operating
chromophores on the surface of metallic nanoparticles. This behavior can be modulated by
irradiation time, solvent composition, DASAs population, and the organic layer underneath
the chromophores. Moreover, the changes in polarity induced by DASAs photoisomerization
are translated onto the colloidal particles giving rise to unusual interfacial and bulk-phase
phenomena, including nonlinear solubility effects and reversible agglomeration that takes
place in a time-controllable fashion. These findings pave the way for the rational design of
new photoresponsive and smart materials.