C60_blue-emission
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The unusual UV/blue-green fluorescence of [60]fullerene at micromolar concentrations in ethyl acetate has been investigated using steady-state and time-resolved fluorescence techniques. This broad emission exhibits longer lifetimes than the well-known red fluorescence typically associated with C60. The relative intensity of the blue and red emission bands is influenced by several factors, including sonication, solvent polarity, the presence of additives (e.g., inert gases or oxygen), and excitation wavelength. Evidence from time-resolved fluorescence anisotropy and computational studies suggests that this emission originates from the formation of ~2 nm-sized fluorophores due to weak intermolecular π–π van der Waals interactions, which become ineffective at concentrations between 2–4 μM. Analysis of the blue/red emission behavior has enabled the estimation of C60 solubility in ethyl acetate at approximately 2 μM.
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