Making fast photoswitches faster - Using hammett analysis to understand the limit of donor-acceptor approaches for faster hemithioindigo photoswitches
Maerz B, Wiedbrauk S, Oesterling S, Samoylova E, Nenov A, Mayer P, De Vivie-Riedle R, Zinth W, Dube H (2014)
Publication Type: Journal article
Publication year: 2014
Journal
Book Volume: 20
Pages Range: 13984-13992
Journal Issue: 43
Abstract
Hemithioindigo (HTI) photoswitches have a tremendous potential for biological and supramolecular applications due to their absorptions in the visible-light region in conjunction with ultrafast photoisomerization and high thermal bistability. Rational tailoring of the photophysical properties for a specific application is the key to exploit the full potential of HTIs as photoswitching tools. Herein we use time-resolved absorption spectroscopy and Hammett analysis to discover an unexpected principal limit to the photoisomerization rate for donor-substituted HTIs. By using stationary absorption and fluorescence measurements in combination with theoretical investigations, we offer a detailed mechanistic explanation for the observed rate limit. An alternative way of approaching and possibly even exceeding the maximum rate by multiple donor substitution is demonstrated, which give access to the fastest HTI photoswitch reported to date. An unexpected principal limit to the photoisomerization rate for donor-substituted hemithioindigos (HTIs; see figure) has been discovered; this provides a quantitative estimate for the highest possible photoisomerization rate. A mechanistic explanation for the observed limit is offered together with an alternative way of approaching the maximum rate by multiple donor substitution. This approach gave access to the fastest HTI photoswitch reported to date.
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Germany (DE)How to cite
APA:
Maerz, B., Wiedbrauk, S., Oesterling, S., Samoylova, E., Nenov, A., Mayer, P.,... Dube, H. (2014). Making fast photoswitches faster - Using hammett analysis to understand the limit of donor-acceptor approaches for faster hemithioindigo photoswitches. Chemistry - A European Journal, 20(43), 13984-13992. https://doi.org/10.1002/chem.201403661
MLA:
Maerz, Benjamin, et al. "Making fast photoswitches faster - Using hammett analysis to understand the limit of donor-acceptor approaches for faster hemithioindigo photoswitches." Chemistry - A European Journal 20.43 (2014): 13984-13992.
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