Please use this identifier to cite or link to this item:
https://apo.ansto.gov.au/dspace/handle/10238/5482
Title: | Characterizing the photoinduced switching process of a nitrospiropyran self-assembled monolayer using in situ sum frequency generation spectroscopy |
Authors: | Darwish, TA Tong, YJ James, M Hanley, TL Peng, QL Ye, S |
Keywords: | Spectroscopy Isomerization Gold Solvents Fluorescence Transistors |
Issue Date: | 2-Oct-2012 |
Publisher: | American Chemical Society |
Citation: | Darwish, T. A., Tong, Y. J., James, M., Hanley, T. L., Peng, Q. L., & Ye, S. (2012). Characterizing the photoinduced switching process of a nitrospiropyran self-assembled monolayer using in situ sum frequency generation spectroscopy. Langmuir, 28(39), 13852-13860. doi:10.1021/la302204f |
Abstract: | Sum frequency generation (SFG) vibrational spectroscopy is employed to investigate the reversible, photoinduced spiro -> merocyanine isomerization of a self-assembled monolayer, the result of attachment of nitrospiropyran to a gold surface using a dithiolane anchoring group. The attachment of these molecular "alligator clips" to spiropyran molecules provide an easily accessible method to self-assemble a robust monolayer of spiropyran on a gold surface, which allows photoswitching of the spiropyran units. Probing the symmetric and antisymmetric stretching modes of the nitro group allows the determination of the structural orientation of the charged moiety with respect to the surface normal as well as the isomerization rates under photoinduced switching conditions. The photoisomerization of the spiropyran SAM on the gold surface is much faster than the rates of switching spiropyrans in a solid crystalline form, and the rate of thermal relaxation of the opened to closed form in this study is found to be on the same time scale as the relaxation of spiropyran when present in solutions with polar solvents. © 2012, American Chemical Society. |
Gov't Doc #: | 4579 |
URI: | http://dx.doi.org/10.1021/la302204f http://apo.ansto.gov.au/dspace/handle/10238/5482 |
ISSN: | 0743-7463 |
Appears in Collections: | Journal Articles |
Files in This Item:
There are no files associated with this item.
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.