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Hartley, Rolfe John 2014-12-15T23:18:40Z 2014-12-15T23:18:40Z 10000-01-01 1986 1986 Tetraalkylammonium salts are shown to quench the fluorescence of the pyrene-N,N-dimethylaniline exciplex in solvents of low dielectric constant. Linear Stern-Volmer plots are obtained for quenching of both lifetime and intensity in dioxane. However, mechanistic complications are implied by intercepts exceeding unity and by the unequal slopes of these plots. Qualitatively similar behavior is observed when the solvents and electrolytes are varied. Historic conductivity data indicate that the quenching species Q in dioxane are aggregates of electrolyte ions, probably ion pairs or quadrapoles. A proposed kinetic model is both qualitatively consistent with the experimental observations and quantitatively self-consistent. An emitting complex formed at a diffusion-controlled rate by an encounter between Q and an exciplex is postulated. The emitting complex is apparently quenched by subsequent encounters with additional Q at rates considerably below the encounter-limited value. Made available in DSpace on 2014-12-15T23:18:40Z (GMT). No. of bitstreams: 1 8623313.pdf: 3396266 bytes, checksum: 21953973ea7456f02ddea75f5e55d0b5 (MD5) Previous issue date: 1986 Embargo set by: Seth Robbins for item 70491 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs U of I Only 146 p. Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1986. http://hdl.handle.net/2142/70325 (UMI)AAI8623313 Chemistry, Analytical A Kinetic and Thermodynamic Study of Exciplex Fluorescence Quenching by Ion Pairs text Chemistry Chemistry University of Illinois at Urbana-Champaign Dissertation Ph.D.