Study of the dependence of hydroxyl groups numbers on treatment time during the synthesis of fullerenols

Vnukova, N.G., Isakova, V.G., Еlesina, V.I., Tomashevich, Y.V., Churilov, G.N.// Fullerenes Nanotubes and Carbon Nanostructures//

https://doi.org/10.1080/1536383X.2025.2485241

Our present study aims to obtain and examine the fullerenols (water-soluble derivatives of fullerenes) with various amounts of hydroxyl groups. The work presents the results of obtaining fullerenols by boiling in nitric acid with subsequent hydrolysis of polynitro intermediates with water at different treatment durations. The obtained samples were certified by X-ray photoelectron and IR spectroscopy methods and it was found that 10-h treatment allowed obtaining fullerenol with the composition C₆₀O_x(OH)_y, where x + y = 12−14, 15-h treatment yielded C₆₀O_x(OH)_y, where x + y = 16−18, and 20-h boiling in acid yielded C₆₀O_x(OH)_y, where x + y = 24−26. The reproducibility of the obtained results allowed the addition of a predictable number of functional groups.