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Infrared Spectroscopic Evidence for Protonated Water Clusters Forming Nanoscale Cages

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Science  21 May 2004:
Vol. 304, Issue 5674, pp. 1134-1137
DOI: 10.1126/science.1096037

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Abstract

Size-dependent development of the hydrogen bond network structure in largesized clusters of protonated water, H+(H2O)n (n = 4 to 27), was probed by infrared spectroscopy of OH stretches. Spectral changes with cluster size demonstrate that the chain structures at small sizes (n ≲ 10) develop into two-dimensional net structures (∼10 < n < 21), and then into nanometer-scaled cages (n ≥ 21).

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