Index Catalog // ScholarsArchive@OSU

Excited state molecular structural evolution and chemical reactivity studied by femtosecond stimulated Raman spectroscopy

Creator:: Han, Fangyuan
Abstract:: In this dissertation, my research work on excited state dynamics of small organic molecules in solutions is presented. Using femtosecond stimulated Raman spectroscopy (FSRS) as the main experimental tool, the excited state hydrogen-bonding dynamics (ESHBD) of Coumarin 102, a common laser dye molecule, in ethanol solution is examined with <150...
Resource Type:: Dissertation
Full Text:: Fangyuan Han for the degree of Doctor of Philosophy in Chemistry presented on November 18, 2014

Free radical hydrogen abstraction from benzocycloalkenes

Creator:: Wong, Rosy Wan-han
Abstract:: The relative rates of hydrogen abstraction from o-xylene, o-diethylbenzene and a series of four benzocycloalkenes by trichloromethyl radical were determined at 70°. The strain energies of the hydrocarbons and the corresponding radicals were calculated. A good correlation between the log of the relative rates and the calculated changes in strain...
Resource Type:: Masters Thesis
Full Text:: AN ABSTRACT OF THE THESIS OF ROSY WAN-HAN WONG for the MASTER OF SCIENCE (Name) (Degree) in

Excited-State Proton Transfer of Photoexcited Pyranine in Water Observed by Femtosecond Stimulated Raman Spectroscopy

Creator:: Han, Fangyuan, Liu, Weimin, and Fang, Chong
Abstract:: We use femtosecond stimulated Raman spectroscopy (FSRS) to illuminate the choreography of intermolecular excited-state proton transfer (ESPT) of photoacid pyranine (8-hydroxypyrene-1,3,6-trisulfonic acid, HPTS) in water. The multidimensional reaction coordinate responsible for photoacidity is revealed to involve sequential activation of characteristic skeletal motions during the ca. 1 ps preparation stage preceding...
Resource Type:: Article
Full Text:: : F. Han, W. Liu, C. Fang, Excited-State Proton Transfer of Photoexcited Pyranine in Water Observed

Tuning Functional Properties of Pyrochlore and Related Oxides via Cation and Anion Substitutions

Creator:: Giampaoli, Gabriella C. S.
Abstract:: Inorganic structures play an important role in materials due to their versatility and diversity. A complete understanding of the structure of a material is vital to enhance the creation of new materials that fill voids in research. The rational design of these compounds is driven by the exploitation of structure-property...
Resource Type:: Dissertation
Full Text:: ) (weighted), (b) Sn2+‒ O'/S (8b), (c) Sn2+‒ O (48f) (weighted), and (d) Nb5+/Sn4+‒ O, all shown vs nominal

Zero kinetic energy photoelectron spectroscopy of jet cooled benzo[a]pyrene from resonantly enhanced multiphoton ionization

Creator:: Zhang, Jie, Harthcock, Colin, Han, Fangyuan, and Kong, Wei
Abstract:: We report zero kinetic energy (ZEKE) photoelectron spectroscopy of benzo[a]pyrene (BaP) via resonantly enhanced multiphoton ionization (REMPI). Our analysis concentrates on the vibrational modes of the first excited state (S₁) and those of the ground cationic state (D₀). Similar to pyrene, another peri-condensed polycyclic aromatic hydrocarbon we have investigated, the...
Resource Type:: Article
Full Text:: . Jarrett, L. Kewley, C. Leitherer, S. Malhotra, M. J. Meyer, E. J. Murphy, M. W. Regan, G. H. Rieke, M. J

Per- and Polyfluoroalkyl Substances (PFASs): Consumer Products, Protocols, and Percutaneous Absorption

Creator:: Rewerts, Justin N.
Abstract:: Per- and polyfluoroalkyl substances (PFAS) are a group of anthropogenic compounds gaining notoriety as contaminants of emerging concern. With the frequent detection of PFAS in the environment, drinking water, and consumer products, awareness and concern from the public regarding PFAS is increasing. The two most notorious PFAS are perfluorooctanoate (PFOA)...
Resource Type:: Dissertation
Full Text:: : New York, 1994; Vol. 50. 3. Barzen-Hanson, K. A.; Roberts, S. C.; Choyke, S.; Oetjen, K.; McAlees, A

Biosynthesis of blasticidin S : mechanistic and stereochemical investigations

Creator:: Prabhakaran, P. C.
Abstract:: Feeding of [3-¹³C, 2-¹⁵N]arginine, 38a, unequivocally established that the β- arginine moiety of blasticidin S, 1, was formed from α-arginine by an intramolecular migration of the α-amino group to the β- position. Further feedings using chirally deuteriated arginines 38e and 38f revealed that the aminomutase process occurred with inversion of...
Resource Type:: Dissertation
Full Text:: . BIOSYNTHESIS OF BLASTICIDIN S: MECHANISTIC AND STEREOCHEMICAL INVESTIGATIONS P. C. Prabhakaran A THESIS

Metabolism of L-α-arginine in the biosynthesis of blasticidin S

Creator:: Woo, Nam-tae
Abstract:: Two labelled arginines, DL-[2,3,3,-²H₃]arginine, 8, and DL-[ ¹³C, 2-¹⁵N]arginine, 9, were synthesized. These were fed to cultures of Streptomyces griseochromogenes in order to probe the mechanism of the apparent arginine-2,3- aminomutase reaction occurring in biosynthesis of blasticidin S, 1. In previous studies of the enzymes lysine-2,3- aminomutase and tyrosine-2,3-aminomutase different...
Resource Type:: Masters Thesis
Full Text:: Blasticidin S. F43 raNfNH2 00H NH2 NH B1asticidin S 1 H+ 1X:2OH N 0 Cytosinine 2. N+ ?H3 CO2 C=41 N

Part I: Synthetic Studies toward C10-functionalized Lycopodium Alkaloids. Part II: Exploration of the Pummerer Cyclization and Its Application to the Total Syntheses of the Abietane Diterpenoids

Creator:: Li, Xin
Abstract:: This dissertation is separated into two parts according to the two major distinct research projects. In Part I, the full account of synthetic studies toward C10-functionalized lycopodium alkaloids is described. In Part II, the detailed discussion on the exploration of the Pummerer cyclization methodology and its application to the total...
Resource Type:: Dissertation
Full Text:: 15. Samame, R. A.; Owens, C. M.; Rychnovsky, S. D. Chem. Sci. 2016, 7, 188−190. 16. DeForest, J. C

C–H···O Non-Classical Hydrogen Bonding in the Stereomechanics of Organic Transformations: Theory and Recognition

Creator:: Johnston, Ryne C. and Cheong, Paul Ha-Yeon
Abstract:: This manuscript describes the role of non-classical hydrogen bonds (NCHBs), specifically C–H···O interactions, in modern synthetic organic transformations. Our goal is to point out the seminal examples where C–H···O interactions have been invoked as a key stereocontrolling element and to provide predictive value in recognizing future and/or potential C–H···O interactions...
Resource Type:: Article
Full Text:: carbonyl oxygen 65 (shown in green lines in Figure 1) — the major TS-(S,S) exhibits a shorter C–H···O

ScholarsArchive@OSU

Excited state molecular structural evolution and chemical reactivity studied by femtosecond stimulated Raman spectroscopy

Free radical hydrogen abstraction from benzocycloalkenes

Excited-State Proton Transfer of Photoexcited Pyranine in Water Observed by Femtosecond Stimulated Raman Spectroscopy

Tuning Functional Properties of Pyrochlore and Related Oxides via Cation and Anion Substitutions

Zero kinetic energy photoelectron spectroscopy of jet cooled benzo[a]pyrene from resonantly enhanced multiphoton ionization

Per- and Polyfluoroalkyl Substances (PFASs): Consumer Products, Protocols, and Percutaneous Absorption

Biosynthesis of blasticidin S : mechanistic and stereochemical investigations

Metabolism of L-α-arginine in the biosynthesis of blasticidin S

Part I: Synthetic Studies toward C10-functionalized Lycopodium Alkaloids. Part II: Exploration of the Pummerer Cyclization and Its Application to the Total Syntheses of the Abietane Diterpenoids

C–H···O Non-Classical Hydrogen Bonding in the Stereomechanics of Organic Transformations: Theory and Recognition

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