期刊
CHEMICAL PHYSICS
卷 333, 期 2-3, 页码 179-185出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.chemphys.2007.01.019
关键词
the hydrogen bond; the heptamethine cyanine dye; the intramolecular vibrational redistribution; solvation; the femtosecond time-resolved stimulated emission pumping fluorescence depletion technique
The ultrafast dynamics of a synthesized near-infrared heptamethine cyanine dye has been studied in the typical alcoholic and aprotic solvents using the ferntosecond time-resolved stimulated emission pumping fluorescence depletion (FS TR SEP FD) technique. The faster decay on the hundreds of the ferritosecond time scale and the slower decay on the order of picosecond are found. The intramolecular vibrational redistribution (IVR) and the ultrafast solvent inertial relaxation should account for the faster decay, while the slower decay is attributed to the diffusive solvent relaxation. The time constants of the slower decay increase with the hydrogen-bonding energy in alcoholic solvent, and the time constants of the slower decay decrease with the dipole moments of the aprotic solvent molecules due to the interactions between the aprotic molecules and the excited dye molecule. (c) 2007 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据