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Internal motion of an electronically excited molecule in viscoelastic media
Ah-Young Jee1, Eunhye Bae, Minyung Lee
1Department of Chemistry and Nanoscience, Ewha Womans University, Seoul 120-750, Republic of Korea.
Abstract:
The twisting motion of trans-4-[4-(dimethylamino)-styryl]-1-methylpyridinium iodide (4-DASPI) in the excited state was investigated in solutions and various polymers in order to understand dependence of molecular rotor dynamics on viscoelasticity. It was observed that the internal motion of electronically excited 4-DASPI correlates strongly with dynamic viscosity and elastic modulus. Our results also showed that condensed phase dynamics of 4-DASPI are governed by the explicit mode coupling between the rotamerizing coordinate and mechanical properties of viscoelastic media.
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