Intermolecular exciton-exciton annihilation in phospholipid vesicles doped with [Ru(bpy)2dppz]2+

in: Chemical Physics Letters (2016)
De la Cadena, Alejandro; Pascher, Torbjörn; Davydova, Dar'ya; Akimov, Denis; Wächtler, Maria; Dietzek, Benjamin; Herrmann-Westendorf, Felix; Presselt, Martin
The ultrafast photophysics of [Ru(bpy)2dppz]2+(dppz = dipyrido[3,2-a:2_,3_-c]-phenazine) embedded into the walls of phospholipid vesicles has been studied by femtosecond time-resolved pump–probe spectroscopy. While [Ru(bpy)2dppz]2+has been studied intensively with respect to its intramolecular charge transfer processes, which are associated with the well-known light-switch effect, this study focuses on intermolecular energy transfer processes taking place upon dense packing of the complexes into a phospholipid membrane composed of dipalmitoyl-L-alpha-phosphatidylglycerol, which can be thought of as a simplistic model of a cellular membrane. The data indicate additional quenching of excited[Ru(bpy)2dppz]2+upon increasing the pump–pulse intensity. Hence, the observed photophysics, which is assigned to the presence of intermolecular exciton–exciton annihilation at high pump-intensities, might be related to the ultrafast photophysics of [Ru(bpy)2dppz]2+when used as a chromophore to stain cells, an effect that may be taken into account during the employment of novel cellular markers based on Ru polypyridine complexes.

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