K. Harmon, Lydia S. Nowos
Sep 16, 1991
Citations
0
Influential Citations
12
Citations
Journal
Journal of Molecular Structure
Abstract
Abstract Hydration of the higher halides of the N,N,N-trimethyl-1-adamantylammonium ion was studied to see if stable (H2O·Br−2 and (H2O·I)2 monohydrate clusters could be prepared with this large cation. The iodide forms a loosely bound clathrate with 12 H2O but no evidence could be obtained for lower, more tightly bound hydrates. The bromide forms a crystalline trihydrate which is only stable under mother liquor, and which rapidly loses H2O on exposure to the air. The chloride forms an isolable crystalline pentahydrate. Vapor pressure vs. H2O content studies demonstrate the pentahydrate is the only hydrate formed by N,N,N-trimethyl-1-adamantylammonium chloride. Variable temperature vapor pressure measurements give a value of 65.02 kcal mol−1 for the dissociation of this pentahydrate, or a minimum value of 6.50 kcal mol−per hydrogen bond broken. None of these three halide salts forms a cluster monohydrate.