Department of Chemistry, Indian Institute of Technology, Patna 800013, Bihar, India.
Phys Chem Chem Phys. 2013 Feb 14;15(6):1894-906. doi: 10.1039/c2cp43483k. Epub 2012 Dec 19.
In this manuscript we have studied the photophysics of 7-(N,N'-diethylamino)coumarin-3-carboxylic acid (7-DCCA) in water/AOT/isooctane reverse micelles. For this purpose we have used steady state absorption and fluorescence emission spectroscopy and time resolved fluorescence spectroscopy. We have studied the spectral behaviour of 7-DCCA inside the water/AOT/isooctane reverse micelles with variation of excitation wavelength. We have studied the dynamics of solvent and rotational relaxation by using two different excitation wavelengths (λ(exi) = 375 nm and λ(exi) = 405 nm). We have observed the excitation wavelength dependent dynamics of 7-DCCA in the reverse micelles. The fluorescence quantum yield, decay time, solvent relaxation time and rotational relaxation time of 7-DCCA in reverse micelles vary with the excitation wavelength. A two step and wobbling-in-cone model was used to interpret the rotational relaxation dynamics of 7-DCCA in reverse micelles.
在本手稿中，我们研究了 7-(N,N'-二乙氨基)香豆素-3-羧酸（7-DCCA）在水/AOT/异辛烷反胶束中的光物理性质。为此，我们使用了稳态吸收和荧光发射光谱以及时间分辨荧光光谱。我们通过改变激发波长研究了 7-DCCA 在水/AOT/异辛烷反胶束中的光谱行为。我们使用两个不同的激发波长（λ(exi) = 375nm 和 λ(exi) = 405nm）研究了溶剂和旋转弛豫的动力学。我们观察到了 7-DCCA 在反胶束中的激发波长依赖性动力学。7-DCCA 在反胶束中的荧光量子产率、衰减时间、溶剂弛豫时间和旋转弛豫时间随激发波长而变化。我们使用两步和锥摇模型来解释 7-DCCA 在反胶束中的旋转弛豫动力学。
