Time-resolved photoacoustic calorimetry of tri- and tetraphenylethylenes. Do S0 and T1 energy surfaces cross?

Photochemistry and Photobiology

Volumn 65, Issue 3, 1997, Pages 530-534

  Caldwell, Richard A ^a   Unett, David J ^a   Vipond, Jeffrey J ^a  

^a UNIVERSITY OF TEXAS AT DALLAS   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 0030940652     PISSN: 00318655     EISSN: None     Source Type: Journal    
DOI: 10.1111/j.1751-1097.1997.tb08599.x     Document Type: Article

References (26)

1. Ni, T., R. A. Caldwell and L. A. Melton (1989) The relaxed and spectroscopic energies of olefin triplets. J. Am. Chem. Soc. 111, 457-464.
2. Melton, L. A., T. Ni and Q. Lu (1989) Photoacoustic calorimetry: a new cell design and improved analysis algorithms. Rev. Sci. Instrum. 60, 3217-3223.
3. Arnaut, L. G., R. A. Caldwell, J. E. Elbert and L. A. Melton (1992) Recent advances in photoacoustic calorimetry: theoretical basis and improvements in experimental design. Rev. Sci. Instrum. 63, 5381-5389.
4. Caldwell, R. A. (1990) Laser flash photolysis studies of intersystem crossing in biradicals and alkene triplets. In Kinetics and Spectroscopy of Carbenes and Biradicals (Edited by M. S. Platz), pp. 77-116. Plenum, New York.
5. Strickland, A. D. and R. A. Caldwell (1993) Thermochemistry of strained cycloalkenes: experimental and computational studies. J. Phys. Chem. 97, 13394-13402.
6. Arnold, D. R. and W. J. Leigh (1981) Merostabilization in radical ions, triplets, and biradicals. 5. The thermal cis-trans isomerization of para-substituted tetraphenylethylenes. Can. J. Chem. 59, 609-620.
7. Braslavsky, S. E. and G. E. Heibel (1992) Time-resolved photothermal and photoacoustic methods applied to photoinduced processes in solution. Chem. Rev. 92, 1381-1410.
8. Peters, K. S. (1994) Time-resolved photoacoustic calorimetry: from carbenes to proteins. Angew. Chem. Int. Ed. Engl. 33, 294-302.
9. Herman, M. S. and J. L. Goodman (1989) Determination of the enthalpy and reaction volume changes of organic photoreactions using photoacoustic calorimetry. J. Am. Chem. Soc. 111, 1849-1854.
10. Westrick, J. A., J. L. Goodman and K. S. Peters (1987) A time-resolved photoacoustic study of the dynamics of enthalpy and volume changes produced in the photodissociation of carbon monoxide from sperm whale carboxymyoglobin. Biochemistry 26, 8313-8318.
11. Caldwell, R. A., S. J. Riley, A. A. Gorman, S. P. McNeeney and D. J. Unett (1992) Relaxed triplet energies of phenylnorbornenes. The role of phenyl-vinyl torsions. Origin of nonvertical triplet excitation transfer. J. Am. Chem. Soc. 114, 4424-4426.
12. Görner, H. (1982) Triplet states of phenylethylenes in solution. Energies, lifetimes and absorption spectra of 1,1-diphenyl-, triphenyl-and tetraphenylethylene triplets. J. Phys. Chem. 86, 2028-2035.
13. Almgren, M. (1967) The natural phosphorescence lifetimes of biacetyl and benzil in fluid solution. Photochem. Photobiol. 6, 829-840.
14. McGlynn, S. P., F. J. Smith and G. Cilento (1964) Some aspects of the triplet state. Photochem. Photobiol. 3, 269-294.
15. Callis, R. R. and R. W. Wilson (1972) On the anomalous luminescence of Michler's ketone: the importance of the local environment. Chem. Phys. Lett. 13, 417-420.
16. Caldwell, R. A. and C. V. Cao (1981) Lifetimes of some styrene triplets in fluid solution. Triplet geometries and the effect of alkylation. J. Am. Chem. Soc. 103, 3594-3595.
17. Caldwell, R. A. and C. V. Cao (1982) Structural effects on twisted olefin triplet lifetimes. Styrene derivatives. J. Am. Chem. Soc. 104, 6174-6180.
18. Caldwell, R. A. (1984) Intersystem crossing in organic photochemical intermediates. Pure Appl. Chem. 56, 1167-1177.
19. 0 ISC in alkene triplets. J. Am. Chem. Soc. 110, 6901-6903.
20. Caldwell, R. A. and L. Zhou (1994) Are perpendicular alkene triplets just 1,2-biradicals? Studies with the cyclopropylcarbinyl clock. J. Am. Chem. Soc. 116, 2271-2275.
21. Caldwell, R. A., J. F. Díaz, D. C. Hrncir and D. J. Unett (1994) Alkene triplets as 1,2-biradicals: the photoaddition of p-acetylstyrene to styrene. J. Am. Chem. Soc. 116, 8138-8145.
22. Brennan, C. M. and R. A. Caldwell (1991) Photoacoustic calorimetry of cycloheptene derivatives. Relaxed triplet energies of 1-phenylcycloheptene and 1,3-cycloheptadiene and the energetics of ground state cis-trans isomerization. Photochem. Photobiol. 53, 165-170.
23. Goodman, J. L., K. S. Peters, H. Misawa and R. A. Caldwell (1986) Use of pulsed time-resolved photoacoustic calorimetry to determine the strain energy of trans-1-phenylcyclohexene and the energy of the relaxed 1-phenylcyclohexene triplet. J. Am. Chem. Soc. 108, 6803-6805.
24. McMackin, C. R. (1992) The role of polar substituents in the intersystem crossing of olefin triplets. M.S. thesis. The University of Texas at Dallas.
25. 1 potential energy curves cross? J. Phys. Chem. 91, 2755-2758.
26. Caldwell, R. A., H. Misawa, E. F. Healy and M. J. S. Dewar (1987) An unusually large secondary deuterium isotope effect. Thermal trans-cis isomerization of trans-1-phenylcyclohexene. J. Am. Chem. Soc. 109, 6869-6870.