Mechanism and Dynamics of Azobenzene Photoisomerization

Abstract

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Femtosecond fluorescence up-conversion spectroscopy of a rotation-restricted azobenzene after excitation to the S1state

“…14,15,21,26,27 The striking similarities then strongly suggest that photoisomerization of the AB derivatives 1 and 2 is governed by the same molecular mechanisms. Whether or to which extent this also applies for the unsubstituted parent AB 3 remains a question which we defer to the end of this discussion.…”

Femtosecond Time-Resolved Photoelectron Spectroscopy

“…Stolow and co-workers applied the TRPES method to the study of electronic relaxation in trans-azobenzene (AZ), 162 often considered the prototypical fast molecular electronic switch as its photoisomerization 163 is the basis for numerous functional materials. Despite this great interest in azobenzene, the basic photoisomerization mechanism remained disputed: 164 in contrast to the expectations of Kasha's rule, the isomerization quantum yields decrease rather than increase with increasing photon energy.…”

The Kinetics of the Cis-to-Trans Thermal Isomerization of 4-Anilino-4’- Nitroazobenzene are Highly Influenced by Solvent Polarity

“…Azobenzenes are common organic dyes that have been extensively studied both experimentally and theoretically owing to their potential applications in material science, medicinal chemistry, molecular switches and other devices [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. They are photo-reactive molecules that undergo reversible photo-isomerization from the more stable trans-isomer to the less stable cis-isomer.…”