Multiple chromophore labeled novel bile acid dendrimers for light harvesting

Abstract

A facile synthesis of bile acid-based dendritic structures with multiple naproxen groups at the periphery and a single anthracenyl moiety on the side chain is described. The photophysical properties have been studied by both steady-state and time-resolved techniques. Absorption studies indicate that there are no ground-state interactions between the chromophores and the molar extinction coefficients increase linearly with increasing number of naproxen units. Upon excitation of the peripheral chromophores, there is efficient intramolecular energy transfer to the anthracenyl chromophore. These novel, non-conjugated dendrimers thus act as efficient molecular light harvesters.