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Solute/Solvent Interactions And Excited State Photophysics Of 1,4-Diphenyl-1,3-Butadiene And 1,4-Diphenyl-1,3-Cyclopentadiene

Dickson, Nicole M.
http://rave.ohiolink.edu/etdc/view?acc_num=osu1206119352

Abstract Details

2008, Master of Science, Ohio State University, Chemistry.
α,ω- diphenylpolyenes have been extensively studied as models for biological molecules such as retinal and β-carotene. The effect of solvent on the excited state and rate of photoisomerization has been the focus of much research. It is well known that as the length of the olefin chain increases, inversion of the 11Bu and 21Ag singlet states occurs. Despite exhaustive research, the excited-state ordering and role of radiationless decay mechanisms remains unclear in 1,4-diphenyl-1,3-butadiene (DPB). It has been found that the ordering of the DPB excited states and the rate of photoisomerization depends greatly on the solvent environment. We will probe the effect of solvent on the 11Bu state through the use of femtosecond transient absorption spectroscopy and picosecond fluorescence spectroscopy. Fluorescence spectroscopy observes the transition from the lowest-energy fluorescing singlet state to the ground state. Transient absorption spectroscopy, on the other hand, has the ability to probe both the 11Bu and the 21Ag state through transitions to higher 1Ag and 1Bu states, respectively. In this work, we will compare the steady-state and excited-state absorption and fluorescence spectra and time-resolved absorption and fluorescence dynamics of DPB and an s-cis analog of DPB, 1,4-diphenyl-1,3-cyclopentadiene (DPCP) in solvents varying in polarizability, viscosity, and protic properties. We observe double-exponential decay dynamics in the transient absorption excited-state decays for solvents with a polarizability above 0.22. The two decay components are attributed to the 11Bu and 21Ag states.
Terry L. Gustafson, PhD (Advisor)
Susan V. Olesik, PhD (Committee Member)
121 p.
Chemistry
diphenylbutadiene solute solvent effects femtosecond spectroscopy transient absorption fluorescence

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Citations

  • Dickson, N. M. (2008). Solute/Solvent Interactions And Excited State Photophysics Of 1,4-Diphenyl-1,3-Butadiene And 1,4-Diphenyl-1,3-Cyclopentadiene [Master's thesis, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1206119352

    APA Style (7th edition)

  • Dickson, Nicole. Solute/Solvent Interactions And Excited State Photophysics Of 1,4-Diphenyl-1,3-Butadiene And 1,4-Diphenyl-1,3-Cyclopentadiene. 2008. Ohio State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1206119352.

    MLA Style (8th edition)

  • Dickson, Nicole. "Solute/Solvent Interactions And Excited State Photophysics Of 1,4-Diphenyl-1,3-Butadiene And 1,4-Diphenyl-1,3-Cyclopentadiene." Master's thesis, Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=osu1206119352

    Chicago Manual of Style (17th edition)

osu1206119352
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© 2008, all rights reserved.
This open access ETD is published by The Ohio State University and OhioLINK.