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

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