Abstract
Gas-phase N2 adsorption on protonated tryptophan and dipeptides, hydrogen-bonded with methanol, was investigated as a model for molecular cloud formation using a tandem mass spectrometer containing a cold ion trap. The number of N2 molecules adsorbed on H+Trp(CH3OH)m and H+Trp-Gly(CH3OH)m (m = 0–3) decreased with increasing number of methanol molecules. The surface of the gas-phase ions was covered by the CH3 groups of methanol upon solvation, which rendered the solvated cluster ions inactive toward N2 adsorption. The lack of N2 adsorption on unsolvated H+Gly-Trp was ascribed to its compact conformation, which was driven by the intramolecular interactions.
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