Time-Resolved Fluorescence Studies of Hematoporphyrin in Different Solvent Systems

Abstract

Time-resolved fluorescence studies of hematoporphyrin in aqueous solution and in different organic solvents arepresented.The observation of two exponential components in the fluorescence decay in aqueous solution reveals the presence of a monomeric and aggregated (probably dimeric) form of the molecule, as confirmed by absorption and fluorescence measurements.The slow component (∼ 15 ns in aqueous solution) and the fast one (∼ 3.8 ns in aqueous solution) are attributed to monomers and dimers, respectively.Higher aggregated species of hematoporphyrin are also present, which are essentially devoid of fluorescence properties. © 1983, Walter de Gruyter. All rights reserved.