LAGORIO MarÍa Gabriela
congresos y reuniones científicas
In situ photoswitching of spirorhodamines isomers in solid state
J. ALDAY; M. M. TORINO; L.ALVAREZ; MARÍA GABRIELA LAGORIO; C. HUCK IRIART; S. SUÁREZ
Viña del Mar
Congreso; XIV Encuentro Latinoamericano de fotoquímica y fotobiología; 2019
Universidad Andrés Bello
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. 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 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. Fig. 1 General structure of spirorhodamines. The equilibrium responsible for the appearance of color is also shown. The forward reaction can be photo-induced with UV light, or by proton addition. These equilibriums were characterized in solid state by reflection, absorption and emission fluorescence spectroscopy, single crystal X-ray diffraction, atomic force microscopy coupled to infrared spectroscopy and computational calculations, evaluating the changes produced after irradiating the corresponding close isomer with ultraviolet light for each compound.References H. Dürr, H. Bouas-Laurent, Photochromism: Molecules and Systems, Eds., 2003. M. Di Paolo, M. L. Bossi, R. Baggio and S. A. Suarez, Acta Crystallogr. Sect. B Struct. Sci. Cryst. Eng. Mater., 2016, 72, 684?692. M. Di Paolo, F. Boubeta, J. Alday, M. Michel Torino, P. Aramendía, S. Suarez and M Bossi, J. Photochem. Photobiol. A, accepted July 2019. LNLS beamlines MX2 and IR1.AcknowledgmentsThis work was supported by Universidad de Buenos Aires, Argentina. The authors would like to thank the economic support of the LNLS.