Photoconversion of Spiropyran to Merocyanine in a Monolayer Observed Using Nanosecond Pump-Probe Brewster Angle Reflectometry
Bernhard Siebenhofer A B C , Sergey Gorelik D , Anton V. Sadovoy D , Martin J. Lear E , Hong Yan Song D , Christoph Nowak A B F G and Jonathan Hobley D GA Austrian Institute of Technology, AIT, Donau-City-Straße 1, 1220 Vienna.
B Centre for Biomimetic Sensor Science, 50 Nanyang Drive, Research Technoplaza, XFrontiers Block, Singapore 63755.
C University of Natural Resources and Life Sciences, Department of Nanobiotechnology, Muthgasse 11, 1190 Vienna, Austria.
D Institute of Materials Research and Engineering, IMRE, 3 Research Link, Singapore 117602.
E Department of Chemistry, National University of Singapore, 3 Science Drive, Singapore 117543.
F Centre of Electrochemical Surface Technology, CEST, Viktor-Kaplan-Str. 2, 2700 Wiener Neustadt, Austria.
G Corresponding authors. Email: hobleyj@imre.a-star.edu.sg; C.Nowak@ait.ac.at
Australian Journal of Chemistry 65(3) 283-289 https://doi.org/10.1071/CH12093
Submitted: 13 February 2012 Accepted: 20 February 2012 Published: 21 March 2012
Abstract
A new apparatus for nanosecond-time-resolved Brewster angle reflectometry is described that can be used to measure transient angle-resolved reflectivity changes in thin films and monolayers in a single pulsed laser shot. In order to achieve this, a cylindrical lens is placed in the probe beam path replacing the goniometer that is usually used for angular scanning in other systems. Using two synchronized nanosecond pulsed lasers in pump-probe configuration it is possible to measure the kinetics of photoinduced conformational changes by altering the delay between pump and probe pulses. The system was used to observe nanosecond time-resolved photodynamics in a spiropyran monolayer at the air-water interface. After UV excitation the spiropyran converted to its merocyanine form in two stages. The first stage occurred with a timescale close to the instrument time resolution (tens of nanoseconds) whereas the second stage occurred over a few hundred nanoseconds.
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