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EXCIMER FORMATION OF N‐(I‐PYRENESULFONYL)‐DIPALMITOYL‐L‐α‐ PHOSPHATIDYLETHANOLAMINE AT THE LIPID‐WATER INTERFACE OF FAT CELL PLASMA MEMBRANES

Abstract— The mechanism of excimer formation of N‐(l‐pyrenesulfonyl)‐dipalmitoyl‐L‐α‐phosphatidylethanolamine incorporated into fat cell plasma membranes was studied by means of steady‐state and pulse fluorometry. It was found that the pyrenesulfonyl group at the lipid‐water interface of the membrane formed an appreciable amount of ground‐state dimers and that the excimer of the pyrenesulfonyl group was formed through two different processes: (i) the collisional interaction of an excited monomer with a ground‐state monomer, and (ii) the direct excitation of a ground‐state dimer (approximate ratio of the two processes, 1:1). Analysis of fluorescence decay curves revealed that the detailed mechanism of excimer formation by process (i) is essentially similar to the mechanism established for the reaction in organic solvents but not to that in a highly viscous medium such as the hydrocarbon core of the membrane.