Dear Sirs and Madams : Hydration of 18 Crown 6 is of great interest to us. We are aware of a few references on crystallographhic investigations as well as simulations of the crown with 4, 6 and 8 molecules. Please let us know of any recent work (ab initio/semi-empirical theory OR experiments) on these systems. In particular, we are interested in understanding the primitive aptterns (patterns) of the hydration process. Thank you very much...Shridhar gadre