Isolating the spectroscopic signature of a hydration shell with the use of clusters: Superoxide tetrahydrate

被引:173
作者
Weber, JM [1 ]
Kelley, JA [1 ]
Nielsen, SB [1 ]
Ayotte, P [1 ]
Johnson, MA [1 ]
机构
[1] Yale Univ, Sterling Chem Lab, New Haven, CT 06520 USA
关键词
D O I
10.1126/science.287.5462.2461
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Cluster spectroscopy, aided by ab initio theory, was used to determine the detailed structure of a complete hydration shell around an anion. Infrared spectra of size-selected O-2(-.) (H2O)(n) (n = 1 to 4) cluster ions were obtained by photoevaporation of an argon nanomatrix. Four water molecules are required to complete the coordination shell. The simple spectrum of the tetrahydrate reveals a structure in which each water molecule is engaged in a single hydrogen bond to one of the four Lobes of the pi* orbital of the superoxide, whereas the water molecules bind together in pairs. This illustrates how water networks deform upon accommodating a solute ion to create a distinct supramolecular species.
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页码:2461 / 2463
页数:3
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