Transient absorption spectroscopy on spiropyran monolayers using nanosecond pump-probe Brewster angle reflectometry

Bernhard Siebenhofer, Sergey Gorelik, Martin J. Lear, Hong Yan Song, Christoph Nowak, Jonathan Hobley

研究成果: Article同行評審

3 引文 斯高帕斯(Scopus)

摘要

Self-assembled monolayers of 11-(3′,3′-dimethyl-6,8- dinitrospiro[chromene-2,2′-indoline]-1′-yl) undecanoic acid (amphiphilic spiropyran) at the air-water interface are studied using Brewster angle reflectometry. Transient kinetics of the spiropyran to merocyanine conversion are recorded in a UV-pump, VIS-probe configuration. By varying the probe wavelength using an optical parametric oscillator, we are able to reconstruct absorption spectra of intermediate states with a time-resolution of 10 nanoseconds, limited by the temporal convolution of the two laser pulses. After UV irradiation, spiropyran converts to merocyanine in two stages. The first occurs within a timescale of several tens of nanoseconds and is heavily convoluted with the system response time, whereas the second stage occurs over a few hundred nanoseconds. During the rise time there is a small red shift in the transient absorption spectrum of ∼20 nm. We assign the red shift and the slower kinetics to the isomerization of a merocyanine isomer cis about the central methine bond to those that are trans about the same bond.

原文English
頁(從 - 到)848-853
頁數6
期刊Photochemical and Photobiological Sciences
12
發行號5
DOIs
出版狀態Published - 2013

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry

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