Comparison of DODCI fluorescence depolarization in glycerol and ethylene glycol: Effect of orientational correlation on excitation transport
Time-correlated single-photon counting was used to obtain anisotropic fluorescence profiles for DODCI in ethylene glycol. Rotational diffusion of DODCI in this solvent was characterized at a concentration of --10/sup -6/ M, where minimal electronic excitation transport occurs during the dye fluorescence lifetime. The fluorescence depolarization due to excitation transport at higher concentrations was separated from that due to rotational diffusion; analysis of our data yields excellent agreement with current transport theories. The discrepancies observed between these theories and our earlier DODCI experiments in glycerol (J. Chem. Phys. 86, 2689 (1987)) appear to originate from orientational correlation of neighboring chromophores in that solvent; glycerol exhibits remarkable coherence in its total radial distribution function out to separations as large as 25 A at temperatures between 250 and 350 K (Z. Naturforsch. Teil A 36, 1045 (1981)).
- Research Organization:
- Department of Chemistry and Ames Laboratory--USDOE Iowa State University, Ames, Iowa 50011
- DOE Contract Number:
- W-7405-ENG-82
- OSTI ID:
- 6193600
- Journal Information:
- J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 87:8; ISSN JCPSA
- Country of Publication:
- United States
- Language:
- English
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