In the investigation of new excited state proton transfer molecules two novel species (3-hydroxypicolinamide and methyl 2-hydroxy-6-methylnicotinate) were observed to have prominent excited state proton transfer. These molecules, with the nitrogen in pyridine ring, have different characteristic proton transfer aspects from those molecules which exhibit "methylsalicylate" type proton transfer. The picosecond transient spectroscopy of these two compounds is discussed where the normal and tautomer species are characterized. In dealing with the role of solvents for the excited state proton transfer a new TSLE (two steps laser excitation) detecting system was applied in the ground state recovery time measurements for two excited state proton transfer compounds 3-hydroxyflavone and 7-hydroxyquinoline. From the results a general discussion of solvent effects for proton transfer is discussed. Finally a remarkable lasing action of 3-hydroxyflavone, the proton transfer laser, is addressed. The observation of excited state proton transfer tautomerization approaches an ideal 4-level laser system involving four different molecular electronic species in the separate electronic states, and constitutes a photo-induced chemical laser. The large red shift tautomer emission of 3-hydroxyflavone and lack of tautomer reabsorption make this molecule suitable for achieving dual frequency simultaneous stimulated emissions in the 3-hydroxyflavone/dye mixture that can be applied in several advanced laser techniques such as CARS (Coherent Antistoke Raman Spectroscopy). / Source: Dissertation Abstracts International, Volume: 46-01, Section: B, page: 0177. / Thesis (Ph.D.)--The Florida State University, 1985.
| Identifer | oai:union.ndltd.org:fsu.edu/oai:fsu.digital.flvc.org:fsu_75500 |
| Contributors | CHOU, PETER PI-TAI., Florida State University |
| Source Sets | Florida State University |
| Detected Language | English |
| Type | Text |
| Format | 186 p. |
| Rights | On campus use only. |
| Relation | Dissertation Abstracts International |
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