Effect of Pressure on Pyrene Excimer Fluorescence in Toluene.
Abstract
The pressure dependence of pyrene fluorescence in toluene has been measured to 10 kbar. The monomer and excimer fluorescence decay kinetics are analyzed to give the rate parameters for excimer formation, dissociation and unimolecular decay as a function of pressure at 296K, 320K and 340K. Activation parameters are evaluated both as a function of temperature and as a function of pressure. The pressure dependence of the association is in one-to-one correspondence with the solvent viscosity. The rate of dissociation is strongly inhibited by high pressures. The volume change on excimer formation is -11 cu cm/mole at 296K. The enthalpy and free energy of excimer formation are -9.7 kcal/mole and -4.2 kcal/mole at 1 atm, and -3.6 kcal/mole and -6.7 kcal/mole at 10 kbar, respectively. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1971
- Accession Number
- AD0732036
Entities
People
- H. W. Offen
- P. C. Johnson
Organizations
- University of California, Santa Barbara