In situ photo switching of Spirorhodamines isomers

LUCIA ALVAREZ; SUAREZ, SEBASTIAN A.*; MATEO MICHEL TORINO; C. HUCK IRIART; ALDAY, JULIETA; GABRIELA LAGORIO

Congreso; 2nd International Conference on Crystal Engineering: From Molecule to Crystal; 2020

At present, the functional materials structurally switchable by stimuli such as heat, the addition of cations, changes of pH, pressure, or light are the motive of innumerable studies to be ideal models to investigate the relation structure-function and new properties derived from that change. In this work, we studied a family of spirorhodamines (SRAs) in solid-state photochemical reactions. These are photochromic molecules with a switching mechanism based on the differences in the fundamental electronic state between isomers.[1] It involves changes in the molecule structure and is thermally reversible.[2,3] In this work, assuming as the hypothesis that in solid-phase the permanence time in the optically active isomer is associated with its structural characteristics, a family of compounds modifying the substituent was synthesized.These equilibria were characterized in solid-state by reflection, absorption and emission fluorescence spectroscopy, single-crystal X-ray diffraction,[4] atomic force microscopy coupled to infrared spectroscopy[4] and computational calculations, evaluating the changes produced after irradiating the corresponding close isomer with ultraviolet light for each compound.