Spirorhodamine in solid-state: rational design of photosensitive materials

JULIETA ALDAY ; MATEO MICHEL TORINO; LUCIA ALVAREZ; GABRIELA LAGORIO; CRISTIAN HUCK IRIART; SEBASTIAN SUAREZ

Congreso; 14th Latin American Meeting on Photochemistry and Photobiology, XIV ELAFOT; 2019

At present, the functional materials structurally switchable by stimuli such as heat, 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 reaction. 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 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 were synthetized. 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.