Department of Chemistry and Nanoscience, Ewha Womans University, Seoul 120-750, Republic of Korea.
J Chem Phys. 2010 Jul 7;133(1):014507. doi: 10.1063/1.3454724.
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.
研究了反式-4-[4-(二甲基氨基)-苯乙烯基]-1-甲基吡啶碘化物（4-DASPI）在溶液和各种聚合物中的激发态扭曲运动，以了解分子转子动力学对粘弹性的依赖性。观察到电子激发态 4-DASPI 的内部运动与动态粘度和弹性模量密切相关。我们的结果还表明，4-DASPI 的凝聚相动力学受构象转变坐标与粘弹性介质力学性能之间明确的模式耦合的控制。
