Rotational diffusion of coumarins: A dielectric friction study
Journal of Fluorescence, ISSN: 1053-0509, Vol: 20, Issue: 4, Page: 797-808
2010
- 12Citations
- 23Captures
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Metrics Details
- Citations12
- Citation Indexes12
- 12
- CrossRef7
- Captures23
- Readers23
- 23
Article Description
The rotational diffusion of three probes: coumarin 522B (C522B), coumarin 307 (C307) and coumarin 138 (C138) with nearly identical size was studied at room temperature employing steady-state and time-resolved fluorescence anisotropy techniques in series of alcohols and alkanes. Experimental observations indicate faster rotation of C138 compared to the other two dyes in alcohols and a faster rotation of C522B than C307 in alkanes. The dielectric friction theories of Nee-Zwanzig (NZ) and van der Zwan-Hynes (ZH) were employed to estimate the friction experienced by the probes in alcohols, in addition to the mechanical friction calculated using Stokes-Einstein-Debye (SED) hydrodynamic with slip boundary condition and Dote-Kivelson-Schwartz (DKS) quasihydrodynamic theories. The observed reorientation times for the three probes do not follow the trend predicted by dielectric friction theories of NZ and ZH. The dipole moments determined from solvatochromic techniques were found to be different for the three probes. © 2010 Springer Science+Business Media, LLC.
Bibliographic Details
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=77955655933&origin=inward; http://dx.doi.org/10.1007/s10895-010-0606-4; http://www.ncbi.nlm.nih.gov/pubmed/20195714; http://link.springer.com/10.1007/s10895-010-0606-4; https://dx.doi.org/10.1007/s10895-010-0606-4; https://link.springer.com/article/10.1007/s10895-010-0606-4; http://www.springerlink.com/index/10.1007/s10895-010-0606-4; http://www.springerlink.com/index/pdf/10.1007/s10895-010-0606-4
Springer Science and Business Media LLC
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