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Scientists report how protons induce water cages

New Haven, Conn. Researchers from Yale University, University of Pittsburgh and University of Georgia have reported new data on how the fundamental arrangement of water molecules is affected by the presence of protons. The work appears in Sciencexpress.

This research is about the surprising flexibility of water molecules that makes water the medium of choice for biological systems. The study examines the 50-year-old question of how many water molecules share a proton, a crucial issue in the transportation of charge in biological processes.

Models predict a proton to be strongly bound to one water molecule (Eigen model) or shared between two water molecules (Zundel model) in a manner that depends on how many water molecules are available. With 21 molecules, it was thought that the water could form a "nanocage" structure that holds the Eigen form of the proton in the center. This report confirms the formation of a dodecahedral (20-sided) cage, but the data displayed no trace of the Eigen species.

To determine how a precisely determined number of water molecules interconnect to form these cages, the scientists first weighed the cluster (after the proton was added), and then monitored changes in the infrared absorption that occurred upon addition of each new water molecule.

"The idea was brought to my attention by John Fenn, Yale Professor Emeritus of Chemical Engineering and Nobel Prize winner in Chemistry '02," said Mark Johnson, professor of chemistry and head of the Yale research team. "Fenn suggested that we might be able to crack this important problem with current technology. We collaborated with groups at Pitt and Georgia using experimental techniques developed in my lab and analyzed the results using Pitt's super computers."

"Water is tricky because sometimes it is just a solvent. Like with coffee. All water does for me is hold the caffeine there, evenly distributed throughout
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Contact: Janet Rettig Emanuel
janet.emanuel@yale.edu
203-432-2157
Yale University
30-Apr-2004


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