- Clathrate Formation in Tetraisopentylammonium Bromide-Water System
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Three polyhydrates of tetraisopentylammonium bromide with 38, 32, and 26 water molecules and also the dihydrate were found in the i-Pent 4NBr-H2O system.
- Aladko,Dyadin,Mikina
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- Hydrogen bonding. Part 59. NMR study of N,N,N-trimethyl-1-adamantylammonium, trimethyl-i-pentylammonium, and tetra-i-pentylammonium ions; an explanation for the anomalous hydration behavior of N,N,N-trimethyl-1-adamantylammonium ion salts
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The halide and hydroxide salts of the N,N,N-trimethyl-1-adamantylammonium ion have hydration behaviors which are different from the common patterns shown by all other quaternary ammonium ion halide and hydroxide salts we have studied.These differences include formation of higher iodide and bromide hydrates, failure to form halide monohydrates, and the existence of unusual molecular ions with three-center covalent hydrogen bonding in the lower fluoride and hydroxide hydrates.The 1H NMR spectrum of N,N,N-trimethyl-1-adamantylammonium ion is not consistent with that expected from application of conventional chemical shift rules.Comparison with the model compounds trimethyl-i-pentylammonium and tetra-i-pentylammonium ions, which have similar C-H arrangements but lack the tricyclic cage, demonstrate that through-cage interactions spread positive charge over the whole structure of the N,N,N-trimethyl-1-adamantylammonium ion.The diffusely charged nature of the ion is correlated with the observed anomalous hydration behavior of its salts.
- Harmon, Kenneth M.,Bulgarella, Jennifer A.
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- Clathrate formation in the system tetraisoamylammonium chloride-water
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In the system i-Am4NCl-H2O two new clathrate hydrates, i-Am4NCl ·32H2O and i-Am4NCl· 27H2O, were revealed, along with the known compound i-Am4NCl· 38H2O. The crystals of all the hydrates were isolated, and their compositions and melting points were determined.
- Aladko,Rodionova,Dyadin
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p. 1855 - 1858
(2007/10/03)
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- Ionization and Dissociation Equilibria in Liquid SO2. 12. The Behavior of Tetrahedral Ions
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Electrolytic conductance of their solutions in liquid sulfur dioxide over a wide range of concentrations was measured for the 21 ionophores, Me4NCl, MeΝClO4, PhMe3NBr, PhMe3NCl, PhMe3NI, Et4NI, Pr4NCl, Pr4NBr, Pr4NI, Bu4NBr, Bu4NI, Bu4NPc, (i-Am)4NBr, (i-Am)4NI, (i-Am)4NB(i-Am)4, (i-Am)3NHBr, Hex4NI, Ph4AsCl, Ph4AsI, Ph4AsPc, and Ph4PPc, at 273.15 K and other temperatures.Limiting equivalent conductances and dissociation constants were determined for these solutes by Shedlovsky's procedure.Utilizing the data of this and other investigations, we calculated thermodynamic quantities for the dissociation equilibria of many of the solutes.Values of Bjerrum's contact distance parameter, a, were calculated from the equilibrium data and compared to sums of estimated ionic radii.Limiting ionic conductances were evaluated by a Fuoss-Coplan division of the limiting equivalent conductance of (i-Am)4NB(i-Am)4.Stokes radii were calculated for the ions employed.The results of the measurements are interpreted in terms of ion-ion and ion-solvent interactions.
- Lichtin, Norman N.,Wasserman, Bernard,Clougherty, Edward,Wasserman, June,Reardon, John F.
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p. 2946 - 2952
(2007/10/02)
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