I almost forgot to answer Paul Shin's basic question about water line
width. Yes, it does does tell you "something" about the bulk water
structure, but the atomic details are still subject to a lot of
interpretation. If you take a very small amount of water, and dissolve in
a non oxygen containing solvent (to maximize sensitivity of
detection) , I had used acetonitrile, you can get even smaller
O-17 NMR linewidths, probably indicating lack of water-water hydrogen
bonds and exchange of same. I didn't look it up but, my memory seems to
recall widths of 25 to 30 Hz, and the ability to actually resolve the J
coupling from the protons. (80 Hz coupling, again, depending on my
somewhat failing memory).
Received on Thu Oct 14 2004 - 11:34:24 MST