In situ photo switching of spirorhodamines isomers in solid state: rational desing of photosensitive materials

SEBASTIÁN SUAREZ; JULIETA ALDAY; MATEO MICHEL TORINO; FERNANDO BOUBETA; LUCÍA ÁLVAREZ; CRISTIÁN HUCK IRIART

Campinas

Congreso; 29 RAU Annual User Meetings LNLS/CNPEM; 2019

CNPEM

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), which are photocromic molecules with a switching mechanism based on the differences in the fundamental electronic state between isomers in solid state photochemical reaction [1]. It involves changes in the molecule structure and is thermally reversible. In this work, assuming as hypothesis that in solid phase the permanence time in the optically active isomer in the range of the visible of a certain compound is associated with its structural characteristics, a family of compounds modifying the substituent were synthetized. These equilibriums were characterized in solid state by single crystal X-ray diffraction [2], atomic force microscopy coupled to infrared spectroscopy [2] and computational calculations, evaluating the changes produced after irradiating the corresponding close isomer with ultraviolet light for each compound. REFERENCES [1] H. Dürr and H. Bouas-Laurent, Photochromism: Molecules and Systems, Eds., 2003. [2] LNLS beamlines MX2 and IR1