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https://hdl.handle.net/11147/2258
Title: | Optical transition rates of a meso-substituted thiacarbocyanine in methanol-in-oil reverse micelles | Authors: | Özçelik, Serdar Atay, N. Zeynep |
Keywords: | Micelles Cyanine dyes Enhanced fluorescence Methanol-in-oil-droplet Spatial confinement |
Publisher: | Elsevier Ltd. | Source: | Özçelik, S., and Atay, N. Z. (2005). Optical transition rates of a meso-substituted thiacarbocyanine in methanol-in-oil reverse micelles. Journal of Luminescence, 113(1-2), 1-8. doi:10.1016/j.jlumin.2004.07.009 | Abstract: | We report the photophysical properties of 3,3′-diethyl-5,5′-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 2.2 ns with increasing molar ratio of methanol to surfactant (w0=[MeOH]/[AOT]), whereas the fluorescence lifetime of DDPT in bulk methanol is 75 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. | URI: | http://doi.org/10.1016/j.jlumin.2004.07.009 http://hdl.handle.net/11147/2258 |
ISSN: | 0022-2313 |
Appears in Collections: | Chemistry / Kimya Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection |
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