OSU Navigation Bar

The Ohio State University University Libraries Knowledge Bank

n,$\Pi^{*}$ AND $\Pi$,$\Pi^{*}$ FLUORESCENCES IN ACRIDINE

Please use this identifier to cite or link to this item: http://hdl.handle.net/1811/9387

Show full item record

Files Size Format View
1975-RH-02.jpg 116.4Kb JPEG image Thumbnail of n,$\Pi^{*}$ AND $\Pi$,$\Pi^{*}$ FLUORESCENCES IN ACRIDINE

Title: n,$\Pi^{*}$ AND $\Pi$,$\Pi^{*}$ FLUORESCENCES IN ACRIDINE
Creators: Yau, Joseph; Kasha, Michael
Issue Date: 1975
Publisher: Ohio State University
Abstract: The N-heterocyclic acridine exhibits two different fluorescences, depending on the nature of the solvent. In a hydroxylic solvent (EPA) glass, acridine exhibits a blue $\Pi$,$\Pi^{*}$ fluorescence, resembling that of the parent polyacene, anthracene. However, in a hydrocarbon glass, acridine shows a broad, structureless, green fluorescence. At $77^{\circ} K$, the lifetime of this emission is $2.5 \mu$sec in hydrocarbon glass. This emission is assigned as the n,$\Pi^{*}$ fluorescence. The lowest absorption spectra of acridine also show characteristic differences in the two kinds of solvents. The excitation spectrum of each fluorescence agrees with the corresponding absorption spectrum. Because of its long lifetime, the $\Pi$,$\Pi^{*}$ fluorescence is not observed readily in a fluid medium at room, temperature. In a low temperature glass, intersystem crossing competes favorably with the n,$\Pi^{*}$ fluorescence. Hence, the phosphorescence quantum yield of acridine is much higher in a hydrocarbon than in a hydroxylic solvent.
Description: Author Institution: Department of Chemistry, Florida State University
URI: http://hdl.handle.net/1811/9387
Other Identifiers: 1975-RH-02
Bookmark and Share