Alanine Water Complexes

作者：Vaquero Vanesa; Eugenia Sanz M; Santiago Mata Isabel Pena; Cabezas Carlos; Lopez Juan C; Alonso Jose L^*

来源：Journal of Physical Chemistry A, 2014, 118(14): 2584-2590.

DOI：10.1021/jp500862y

Two complexes of alanine with water, alanine (H2O) (n = 1,2), have been generated by laser ablation of the amino acid in a supersonic jet containing water vapor and characterized using Fourier transform microwave spectroscopy. In the observed complexes, water molecules bind to the carboxylic group of alanine acting as both proton donors and acceptors. In alanine-H2O, the water molecule establishes two intermolecular hydrogen bonds forming a six-membered cycle, while in alanine (H2O)(2) the two water molecules establish three hydrogen bonds forming an eight-membered ring. In both complexes, the amino acid moiety is in its neutral form and shows the conformation observed to be the most stable for the bare molecule. The microsolvation study of alanine-(H2O)(n) (n = 1,2) can be taken as a first step toward understanding bulk properties at a microscopic level.

• 出版日期2014-4-10