Quenching of confined C480 dye in the presence of metal-conjugated γ-Cyclodextrin

Abstract

Here we demonstrate the designing of new optical-based materials having nanotubular γ-CD aggregates linked by coumarin 480 dyes: Au nanoparticles for light harvesting system. It is found that the fluorescence quenching of the coumarin 480 dye increases from 79 to 99% due to confinement of the dye inside γ-CD. The formation of the nanotubular structure of C480/CD complex is confirmed by fluorescence anisotropy decay and TEM study. The average decay times of the C480 dye inside γ-CD in the absence and presence of attached Au nanoparticles are 4.77 and 1.91 ns, respectively, and the rate constant of ET is found to be 3.13 × 10⁸ s^-1.