K. Harmon, A. Akin
Sep 16, 1991
Citations
0
Influential Citations
1
Citations
Journal
Journal of Molecular Structure
Abstract
Abstract Vapor pressure vs. H2O content studies demonstrate that phosphorylcholine chloride calcium salt forms two hydrates, a monohydrate and a tetrahydrate, in the range 0–4 mol H20 mol−1 of salt; there is no dihydrate or trihydrate. Equilibrium vapor pressure measurements show that ΔH0 of dissociation per mol H20 lost is greater for the tetrahydrate (16.08 kcal mol−1) than for the monohydrate (12.49 kcal mo−1); the lower stability of the tetrahydrate arises from entropy effects. The IR spectrum of the tetrahydrate is that of a framework clathrate hydrate and suggests that the -P03 group may act as a very weak hydrogen-bond acceptor. In the monohydrate the -P03 group is not involved in hydrogen bonding. Neither hydrate contains POH bonds.