کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9586302 | 1505938 | 2005 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Optical transition rates of a meso-substituted thiacarbocyanine in methanol-in-oil reverse micelles
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Optical transition rates of a meso-substituted thiacarbocyanine in methanol-in-oil reverse micelles Optical transition rates of a meso-substituted thiacarbocyanine in methanol-in-oil reverse micelles](/preview/png/9586302.png)
چکیده انگلیسی
We report the photophysical properties of 3,3â²-diethyl-5,5â²-dichloro-9-phenylthiacarbocyanine (DDPT) in methanol-in-oil (m/o) reverse micellar systems which form methanol droplets stabilized with anionic surfactant aerosol-OT (AOT) in n-heptane. The fluorescence quantum yield of DDPT is enhanced by a factor of 17 in the methanol droplet in comparison with bulk methanol. The fluorescence lifetimes of DDPT in m/o reverse micelles are prolonged up to 2.2Â ns with increasing molar ratio of methanol to surfactant (w0=[MeOH]/[AOT]), whereas the fluorescence lifetime of DDPT in bulk methanol is 75Â ps. The non-radiative rate constants of DDPT in the droplets are decreased by a factor of 40, resulting in a remarkable enhancement in quantum yields, indicating that internal motions of DDPT in the droplets are significantly reduced due to strong electrostatic interactions between the positively charged DDPT and the negatively charged sulfonate head-groups of AOT and the spatial confinement induced by the reverse micellar structure.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Luminescence - Volume 113, Issues 1â2, May 2005, Pages 1-8
Journal: Journal of Luminescence - Volume 113, Issues 1â2, May 2005, Pages 1-8
نویسندگان
Serdar Ãzçelik, N. Zeynep Atay,