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Light-induced isomerization dynamics of a cyanine dye in the modulus-controlled regime

Title
Light-induced isomerization dynamics of a cyanine dye in the modulus-controlled regime
Authors
Jee A.-Y.Park S.Lee M.
Ewha Authors
이민영
SCOPUS Author ID
이민영scopus
Issue Date
2011
Journal Title
Physical Chemistry Chemical Physics
ISSN
1463-9076JCR Link
Citation
vol. 13, no. 33, pp. 15227 - 15232
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
The trans-cis isomerization of an excited molecule converts light energy into mechanical motion, which interacts cooperatively with its surroundings. To understand such a photodynamic process in solids, we investigated the internal twisting motion of 1,1′-diethyl-2,2′-cyanine iodide (DCI) in a series of poly(alkyl methacrylate) (PAMA) polymers by measuring the Young's moduli of the polymers with atomic force microscopy nanoindentation and the fluorescence lifetimes of the dye with time-correlated single photon counting. We found that the isomerization rate constant obtained from the average lifetime correlated well with the mechanical property of the matrix. Our results show that the light-induced molecular motion lies in the modulus-controlled regime in which the polymer matrix not only provides a rigid environment for the dynamics of the molecules but also participates actively in the motion. The concept of elastic modulus may be applicable to molecular rotor dynamics in any synthetic polymer and, in principle, can be extended to biopolymers such as proteins or DNA. © 2011 The Owner Societies.
DOI
10.1039/c1cp20835g
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자연과학대학 > 화학·나노과학전공 > Journal papers
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