Title

Photochemical And Spectroscopic Studies Of Pah Motion At Interfaces

Abstract

Photochemical and spectroscopic studies of PAH, e.g., anthracene, at silica gel interfaces with air and organic solvents were conducted and revealed that photochemical dimerization reactions can occur at lower than anticipated concentrations in solid-solvent slurries and well-below monolayer coverage at solid-air interfaces. The rate (or efficiency) of anthracene dimerization in dilute homogeneous solutions (< 1 × 10-2 M) was proportional to the anthracene concentration. In the slurry, ≈ 70% of the anthracene was adsorbed on the silica surface. The increase in photochemical dimerization rate was attributed to the increased anthracene concentration on the surface and in the immediate vicinity of the surface where anthracene was dynamically exchanging between the surface and solution. When PAH were adsorbed at silica-air interfaces, in the absence of any solvent, molecule translation on the surface was fairly slow. Similar dimerization reactions were observed for acenaphthylene and tetracene at low surface coverages. Rotational diffusion rates were determined for silica-attached 1-hydroxypyrene at the solid/air interface through time-dependant fluorescence anisotropy measurements. This is an abstract of a paper originally presented at the 225th ACS National Meeting (New Orleans, LA 3/23-27/2003).

Publication Date

12-1-2003

Publication Title

ACS, Division of Environmental Chemistry - Preprints of Extended Abstracts

Volume

43

Issue

1

Number of Pages

819-821

Document Type

Article; Proceedings Paper

Personal Identifier

scopus

Socpus ID

27644481588 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/27644481588

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