Rotational Diffusion of Medium Sized 7-[Diethylamino]-2H-1-Benzopyran-2-One Molecule in Alcohols: Study of Temperature and Solvent Viscosity Effect

  • Anil Kumar
  • Y. F. Nadaf
  • C. G. RenukaEmail author


The rotational re-orientations times of the 7-[diethylamino]-2H-1-benzopyran-2-one (7-DHB) dye molecule have been examined in ethanol and octanol solvents when macroscopic solvent viscosity parameter is varied by varying the temperature, by employing the steady-state fluorescence depolarisation and Time-Correlated Single Photon Counting (TCSPC) techniques. Experimental observation shows that 7-DHB probe is experiencing higher friction in octanol compared to ethanol and rotates slower by a factor of 7.3. The hydrodynamic Stokes Einstein’s Debye theory (SED) with a stick, slip boundary conditions parameters, quasi-hydrodynamic models (Dote-Kivelson-Schwartz and Geirer-Wirtz) were used to determine mechanical friction and found an interesting towards super slip trend. Dielectric frictional theories of point dipole, Nee-Zwanzig and van der Zwan-Hynes both models fail to describe experimentally observe dielectric friction trends. Evidently, both hydrodynamic and dielectric models failed to explain the examined behavior, even in the qualitative way in alcohols.


Laser dye Hydrodynamic theories Reorientation times Super slip Point dipole dielectric theories 



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Authors and Affiliations

  1. 1.P.G. Department of Physics, Sri Siddeshwara Govt.First Grade CollegeNaragundIndia
  2. 2.Department of Physics and Research CenterMaharani Science College for WomenBengaluruIndia
  3. 3.Department of Physics, Jnanabharathi campusBangalore UniversityBengaluruIndia

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