Please use this identifier to cite or link to this item:
http://hdl.handle.net/1942/3414
Title: | Fluorescence anisotropy of 2,5,8,11-tetra-tert-butylperylene and 2,5,10,13-tetra-tert-butylterrylene in alkanes and alcohols | Authors: | DE BACKER, Steve Dutt, GB DeSchryver, FC Mullen, K Holtrup, F AMELOOT, Marcel |
Issue Date: | 1996 | Publisher: | AMER CHEMICAL SOC | Source: | JOURNAL OF PHYSICAL CHEMISTRY, 100(2). p. 512-518 | Abstract: | The fluorescence anisotropy of two neutral and nonpolar molecules, 2,5,8,11-tetra-tert-butylperylene (TP) and 2,5,10,13-tetra-tert-butylterrylene (TT), is studied in a series of n-alcohols and alkanes. Both probes show an absorption band in the UV region and one in the visible region. The polarized fluorescence decay traces are globally analyzed over different excitation wavelengths. TP and TT can be modeled as oblate ellipsoids with essentially identical rotational correlation times. The anisotropy decay can well be approximated by a monoexponential model for both solvent series. The rotational correlation times (phi) vary linearly with viscosity (eta) for both solvent series. Higher values for phi/eta are reached in alkanes than in alcohols, the effect being more pronounced for TP than for TT. The predictions of the quasihydrodynamic models of Gierer-Wirtz and of Dote-Kivelson-Schwartz (DKS) are compared to the experimental data. Only the DKS model can predict qualitatively the experimental observations. The difference in rotational correlation times can be explained in terms of the higher free volume in alcohols than in alkanes. Anisotropy decay measurements of TT in hexadecane and decanol in the temperature range 25-60 degrees C give additional support to the applicability of the DKS theory for nonpolar solutes and suggest that an Arhenius formalism to calculate the activation energy for rotation from the SDE equation is not appropriate when solute and solvent molecules are of similar magnitude. | Notes: | KATHOLIEKE UNIV LEUVEN,DEPT CHEM,B-3001 HEVERLEE,BELGIUM. LIMBURGS UNIV CENTRUM,B-3590 DIEPENBEEK,BELGIUM. MAX PLANCK INST POLYMER RES,W-6500 MAINZ,GERMANY. | Document URI: | http://hdl.handle.net/1942/3414 | DOI: | 10.1021/jp9517108 | ISI #: | A1996TP94200016 | Type: | Journal Contribution |
Appears in Collections: | Research publications |
Show full item record
SCOPUSTM
Citations
35
checked on Sep 3, 2020
WEB OF SCIENCETM
Citations
31
checked on Apr 29, 2024
Page view(s)
62
checked on Jun 19, 2023
Google ScholarTM
Check
Altmetric
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.