Infrared spectra of amino acid and peptide monoderivatives of [60]fullerene and their methyl esters

IR spectra (4000-400 cm^-1) of [60]fullerene monoderivatives of amino acids and dipeptides and several of their methyl esters have been found to differ strongly from those of starting compounds, in that none of them contained the characteristic modes of free C₆₀ but instead displayed several new absorptions which indicate the presence of amino acid and peptide moieties in the [60]fullerene derivative molecules, these fragments being in a zwitterion form in most cases.