Skip to Main Content
 

Global Search Box

 
 
 
 

Files

File List


osu1306872674.pdf (4.99 MB)

ETD Abstract Container

Abstract Header

Exploration of the Excited States of Organic Molecules and Metal Complexes Using Ultrafast Laser Spectroscopy

Dickson, Nicole Marie
http://rave.ohiolink.edu/etdc/view?acc_num=osu1306872674

Abstract Details

2011, Doctor of Philosophy, Ohio State University, Chemistry.
The excited states of organic molecules and inorganic complexes were examined using ultrafast time resolved spectroscopies. Femtosecond transient absorption was used to unveil the early-time dynamics of organic molecules and inorganic complexes. Picosecond time correlated single photon counting was used to observe emission lifetimes. Nanosecond transient absorption spectroscopy was used to observe the molecules and complexes on the nanosecond to microsecond time scale. The nature of the lowest excited symmetry state was studied in 1,4-diphenyl-1,3-butadiene and 1,1,4,4-tetraphenyl-1,3-butadiene and was determined to have mixed character that was highly dependent on solvent. The inorganic complexes studied here have application as photodynamic therapy (PDT) agents. [Ru(bpy)2(BN)2]2+ complexes, where BN is methylbenzonitrile or methoxybenzonitrile, undergo ligand exchange in water. Upon photoaquation, the complexes may bind to DNA and cause cell death. The process of ligand exchange was studied on the femtosecond time scale. It was found that ligand exchange occurs in concert with intersystem crossing to the triplet state within the time duration of the laser pulse (300 fs). Finally, the PDT agents [Ru(bpy)2(dppn)]2+ and [Os(bpy)2(dppn)]2+ were studied to unveil the effects of the low-lying LC 3ππ* state on the excited-state decay processes. From the initial excited state in [Ru(bpy)2(dppn)]2+ and [Os(bpy)2(dppn)]2+ deactivation to the 3 ππ* state and the 3 MLCT state occurs within 300 fs.
Claudia Turro, PhD (Advisor)
Terry Gustafson, PhD (Advisor)
Anne Co, PhD (Committee Member)
220 p.
Analytical Chemistry; Chemistry; Physical Chemistry
laser spectroscopy; ultrafast; Ru(II) complex; photodynamic therapy; linear polyenes; femtosecond;

Recommended Citations

Citations

  • Dickson, N. M. (2011). Exploration of the Excited States of Organic Molecules and Metal Complexes Using Ultrafast Laser Spectroscopy [Doctoral dissertation, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1306872674

    APA Style (7th edition)

  • Dickson, Nicole. Exploration of the Excited States of Organic Molecules and Metal Complexes Using Ultrafast Laser Spectroscopy. 2011. Ohio State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1306872674.

    MLA Style (8th edition)

  • Dickson, Nicole. "Exploration of the Excited States of Organic Molecules and Metal Complexes Using Ultrafast Laser Spectroscopy." Doctoral dissertation, Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1306872674

    Chicago Manual of Style (17th edition)

osu1306872674
1,947
© 2011, all rights reserved.
This open access ETD is published by The Ohio State University and OhioLINK.