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1 October 2000 Rotational Relaxation of Neutral Red in Alkanes: Effect of Solvent Size on Probe Rotation¶
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Abstract

Rotational reorientation times of a polar molecule neutral red (NR) have been measured in n-alkanes using steady-state fluorescence depolarization technique. The rotational dynamics of NR in alkanes is described by the Stokes–Einstein–Debye hydrodynamic theory with slip boundary condition. However, we have observed that as the size of the solvent molecule becomes bigger than the size of the solute molecule, the probe molecule experiences reduced friction and the experimentally measured reorientation times are shorter than those predicted by the hydrodynamic theory. These size effects have been analyzed using quasihydrodynamic theories.

M. K. Singh "Rotational Relaxation of Neutral Red in Alkanes: Effect of Solvent Size on Probe Rotation¶," Photochemistry and Photobiology 72(4), 438-443, (1 October 2000). https://doi.org/10.1562/0031-8655(2000)072<0438:RRONRI>2.0.CO;2
Received: 3 February 2000; Accepted: 1 June 2000; Published: 1 October 2000
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