Fluorescence intensities and lifetimes of aromatic hydrocarbons in cyclohexane solution: evidence of contact charge-transfer interactions with oxygen

J Thomas Brownrigg; Jonathan E Kenny

doi:10.1021/jp807495h

Fluorescence intensities and lifetimes of aromatic hydrocarbons in cyclohexane solution: evidence of contact charge-transfer interactions with oxygen

J Phys Chem A. 2009 Feb 12;113(6):1049-59. doi: 10.1021/jp807495h.

Authors

J Thomas Brownrigg¹, Jonathan E Kenny

Affiliation

¹ Department of Chemistry, Tufts University, 62 Talbot Avenue, Medford, Massachusetts 02155, USA.

PMID: 19146380
DOI: 10.1021/jp807495h

Abstract

The fluorescence lifetimes and intensities of naphthalene, phenanthrene, chrysene, and pyrene were measured as a function of oxygen concentration in cyclohexane solution. Stern-Volmer plots of intensities and lifetimes versus oxygen concentrations revealed smaller Stern-Volmer quenching coefficients for lifetimes than for intensities. Analysis of the data in terms of static quenching models suggests that the Stern-Volmer slope differences result from a charge-transfer interaction between the aromatic and oxygen molecules in the cases of naphthalene and pyrene. A method of estimating dissolved oxygen concentration using the cyclohexane-oxygen charge-transfer band is also reported.