Chemical Physics Letters ( IF 2.8 ) Pub Date : 2019-01-23 , DOI: 10.1016/j.cplett.2019.01.029 Akimasa Fujihara , Ayano Shimada
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.
中文翻译:
质量选择的氢键团簇离子对气相N 2的吸附
使用含有冷离子阱的串联质谱仪,研究了质子化的色氨酸和二肽与甲醇氢键合的气相N 2吸附,作为形成分子云的模型。H + Trp(CH 3 OH)m和H + Trp-Gly(CH 3 OH)m(m = 0-3)上吸附的N 2分子数量随着甲醇分子数量的增加而减少。溶剂化时,气相离子的表面被甲醇的CH 3基团覆盖,这使溶剂化的簇状离子对N 2吸附失去活性。缺乏N 2未溶剂化的H + Gly-Trp的吸附归因于其紧凑的构象,这是由分子内相互作用驱动的。