Near-Complete Bidirectional Photoisomerization of <i>para</i>-Dialkylamino-Substituted Arylazopyrazoles under Violet and Green or Red Lights
Supriya Bhunia, Anirban Dolai, Satyajit Bera, Subhas Samanta
Abstract
para-Dimethylamine- and para-pyrrolidine-substituted arylazopyrazoles display very high to near-quantitative or quantitative bidirectional isomerization under violet and green or red lights in both polar (DMSO and DMSO/aqueous buffer, pH 7.5) and nonpolar solvents. These switches confer a reasonable thermal stability to their cis-states (t1/2 ≈ 4–7 h in DMSO and DMSO/buffer) and also show a high level of resistance to photobleaching and an impressive stability to reduction by glutathione. Using DFT calculations, attempts have been made to decipher the photophysical properties and thermal stabilities of the cis isomers.
Topics & Concepts
DimethylaminePhotoisomerizationChemistryIsomerizationPhotochemistryPyrrolidineThermal stabilityAqueous solutionPhotobleachingOrganic chemistryFluorescenceCatalysisPhysicsQuantum mechanicsPhotochromic and Fluorescence ChemistryRadical Photochemical ReactionsPhotoreceptor and optogenetics research