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Photophysical Studies: I. Singlet Quenching in Naphthalene-Conjugated Diene Bichromophores. II. Flourescence of Aromatic Hydrocarbon-Tertiary Amine Bichromophores. III. Intersystem Crossing in the Methyl Benzenes

Citation

Quina, Frank Herbert (1973) Photophysical Studies: I. Singlet Quenching in Naphthalene-Conjugated Diene Bichromophores. II. Flourescence of Aromatic Hydrocarbon-Tertiary Amine Bichromophores. III. Intersystem Crossing in the Methyl Benzenes. Dissertation (Ph.D.), California Institute of Technology. https://resolver.caltech.edu/CaltechTHESIS:07202018-143432826

Abstract

Part I describes the synthesis, photochemistry, and fluorescence of several naphthalene-conjugated diene bichromophores. The data for these systems and for suitable reference systems are used to discuss and develop models for the bimolecular singlet quenching phenomenon.

Part II describes the synthesis and fluorescence of several aromatic hydrocarbon-tertiary amine bichromophores. The fluorescence properties of these systems are related to the accessibility of various conformations and possible configurational requirements of amine singlet quenching are discussed.

Part III reports the results of a systematic study of intersystem crossing in the methyl benzenes. Along with measured singlet lifetimes and literature values for the fluorescence quantum yields, these data allow evaluation of the rate constants for deactivation of the first excited singlet state of the methyl benzenes in degassed cyclohaxane solution. A qualitative dependence of the intersystem crossing rates on the sym­metry of methyl substitution is found and mechanisms involving inter­system crossing to the second triplet state are proposed to account for this result. Non-radiative decay of the first excite singlet state via pathways other than fluorescence and intersystem crossing is found to be a significant process for all of the methyl benzenes except p-xylene.

Item Type:Thesis (Dissertation (Ph.D.))
Subject Keywords:Chemistry
Degree Grantor:California Institute of Technology
Division:Chemistry and Chemical Engineering
Major Option:Chemistry
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Unknown, Unknown
Thesis Committee:
  • Unknown, Unknown
Defense Date:31 January 1973
Funders:
Funding AgencyGrant Number
NSFUNSPECIFIED
CaltechUNSPECIFIED
Record Number:CaltechTHESIS:07202018-143432826
Persistent URL:https://resolver.caltech.edu/CaltechTHESIS:07202018-143432826
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:11130
Collection:CaltechTHESIS
Deposited By: Benjamin Perez
Deposited On:23 Jul 2018 17:22
Last Modified:02 Dec 2020 01:04

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