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Ultrafast Excited State Investigation of Ruthenium and Osmium Polypyridyl Sulfoxide Complexes and BOPHY Dyes

Wang, Lei
http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1433864223

Abstract Details

2015, Doctor of Philosophy (PhD), Ohio University, Chemistry and Biochemistry (Arts and Sciences).
Ruthenium and osmium polypyridyl sulfoxide complexes that undergo photochemical S-O linkage isomerization have gained sufficient research attention due to the potential application in solar energy storage, information storage and in development of new photorefractive materials. Among those sulfoxide complexes, the bis-sulfoxide complexes are of specific interest since some of them features two isomerizations upon absorbing one photon. However, the excited state isomerization details as well as how to change the yield of photoproducts are not fully understood. Ultrafast transient absorption spectroscopy was utilized to investigate the excited state isomerization mechanism of bis-sulfoxide complex [Ru(bpy)2(dmso)2]2+. It was found that single photon excitation triggers two sulfoxide isomerizations. Meanwhile, the photoproduct yield of S,O- and O,O-bonded isomers was found to be controlled by the photoexcitation wavelength. The spectroscopic data as well as the kinetics further our understanding of the excited state relativities for the bis-sulfoxide complexes. In order to learn more about the motion of the sulfoxide group during isomerization process, polarization transient absorption anisotropy measurements were performed to monitor this motion optically. Polarization anisotropy measurements report on the relative orientation of the transition dipole to the excitation dipole. The motion of the sulfoxide group was concluded to occur in the time scale of ~1 ps. In addition, the ultrafast study of a new class of highly fluorescent boron difluoride dyes was resented.
Jeffrey Rack (Advisor)
142 p.
Chemistry
ultrafast; transient absorption spectroscopy; ruthenium; osmium; polarization anisotropy; photochemistry; BOPHY; sulfoxide;

Recommended Citations

Citations

  • Wang, L. (2015). Ultrafast Excited State Investigation of Ruthenium and Osmium Polypyridyl Sulfoxide Complexes and BOPHY Dyes [Doctoral dissertation, Ohio University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1433864223

    APA Style (7th edition)

  • Wang, Lei. Ultrafast Excited State Investigation of Ruthenium and Osmium Polypyridyl Sulfoxide Complexes and BOPHY Dyes. 2015. Ohio University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1433864223.

    MLA Style (8th edition)

  • Wang, Lei. "Ultrafast Excited State Investigation of Ruthenium and Osmium Polypyridyl Sulfoxide Complexes and BOPHY Dyes." Doctoral dissertation, Ohio University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1433864223

    Chicago Manual of Style (17th edition)

ohiou1433864223
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© 2015, all rights reserved.
This open access ETD is published by Ohio University and OhioLINK.