The dynamics of aqueous Zn2+ solutions: a study using incoherent quasi-elastic neutron scattering

The method of high-resolution incoherent quasi-elastic neutron scattering (IQENS) is used to study the proton diffusion and cation to water-proton binding time in 1.98 mol al (mol. kg-1) and 2.58 molal aqueous Zn(ClO4)2 solutions and a 1.96 molal aqueous ZnCl2 solution at room temperature. In the perchlorate solutions a lower limit of tau 1>10-10 s is found for the Zn2+ to water-proton binding time and an upper limit of tau 1<5*10-9 s is estimated. The chloride solution cannot be described by a single proton population on the IQENS observation time scale. Furthermore, it cannot be described by a model which assumes that only those protons bound to free Zn2+ ions are in slow exchange, the fraction of these ions being taken from the published sets of stability constants used to describe the equilibria between the various zinc complexes present in solution.

[1]  Y. Waseda,et al.  An anomalous X-ray scattering study of an aqueous solution of ZnCl2 , 1989 .

[2]  A. J. Easteal,et al.  Hydration models for trivalent metal ion solutions: Diffusion of Fe(III) and 3HHO and shear viscosities in iron(III) perchlorate solutions at 298 K , 1989 .

[3]  K. Tamura Ultrasonic absorption study of the complex formation of zinc(II) carboxylates in aqueous solution , 1989 .

[4]  G. Laurenczy,et al.  Variable-pressure kinetic and equilibrium study of monocomplex formation of copper(II) and zinc(II) with 2-chloro-1,10-phenanthroline in aqueous solution , 1989 .

[5]  P. Salmon,et al.  An incoherent quasi-elastic neutron scattering study on the dynamics of aqueous Cr3+ perchlorate solutions , 1989 .

[6]  H. Ohtaki,et al.  X-ray diffraction and Raman studies of zinc(II) chloride hydrate melts, ZnCl2.rH2O (r = 1.8, 2.5, 3.0, 4.0, and 6.2) , 1989 .

[7]  P. Salmon Hydration of complexed chloride ions in aqueous zinc(II) chloride solution , 1989 .

[8]  P. Salmon The dynamics of water molecules in ionic solution as studied by incoherent quasi-elastic neutron scattering , 1989 .

[9]  M. Fontana,et al.  Quasielastic scattering in ZnCl2 aqueous solution , 1989 .

[10]  R. Mills Self-diffusion in electrolyte solutions , 1989 .

[11]  J. V. D. Maarel A H, D, and 17O Nuclear magnetic relaxation study on the structure and dynamics of water in concentrated ZnCl2 , 1989 .

[12]  L. Helm,et al.  Oxygen-17 nuclear magnetic resonance kinetic study of water exchange on the lanthanide(III) aqua ions , 1988 .

[13]  John E. Enderby,et al.  The hydration structure around chloride ions in aqueous solution , 1988 .

[14]  W. Howells,et al.  The dynamics of water molecules in ionic solution. II. Quasi-elastic neutron scattering and tracer diffusion studies of the proton and ion dynamics in concentrated Ni2+, Cu2+ and Nd3+ aqueous solutions , 1987 .

[15]  P. Salmon The dynamics of water molecules in ionic solution. I. The application of quasi-elastic neutron scattering to the study of translational diffusive proton motion , 1987 .

[16]  P. Rabe,et al.  EXAFS-STUDY OF THE Zn2+ COORDINATION IN AQUEOUS HALIDE SOLUTIONS , 1986 .

[17]  D. Beveridge,et al.  Thermal motion from monte carlo simulations of aqueous ionic solutions , 1986 .

[18]  M. Fontana,et al.  Low- and very-low-frequency dynamics in ZnCl2 aqueous solutions: a comparative investigation by Raman, Rayleigh wing and inelastic neutron scattering , 1985 .

[19]  H. Wakita,et al.  The structures of zinc bromide complexes in aqueous solution , 1985 .

[20]  M. Fontana,et al.  Incoherent quasielastic neutron scattering from H2O and aqueous ZnCl2 solutions , 1984 .

[21]  R. Mills,et al.  Unusual behavior of transport coefficients in aqueous solutions of zinc chloride at 25.degree.C , 1984 .

[22]  W. Howells,et al.  The dynamics of water molecules in ionic solution , 1983 .

[23]  G. Pálinkás,et al.  Complex Formation in an Aqueous ZnBr2 Solution Based on Electron Diffraction, X-ray Scattering and Raman Spectra , 1983 .

[24]  M. Shimoji,et al.  NMR relaxation study of water molecules in concentrated zinc chloride solutions , 1982 .

[25]  G. Corongiu,et al.  Monte Carlo simulations of water clusters around Zn++ and a linear Zn++⋅CO2 complex , 1980 .

[26]  R. Paterson,et al.  Transport in aqueous solutions of group IIB metal salts at 298.15 K. Part 5.—Irreversible thermodynamic parameters for zinc perchlorate and verification of Onsager's reciprocal relationships , 1978 .

[27]  H. Ohtaki,et al.  X-Ray Diffraction Studies of the Structures of Hydrated Divalent Transition-Metal Ions in Aqueous Solution , 1976 .

[28]  T. R. Stengle,et al.  Contact ion pairing of the perchlorate ion. Chlorine-35 nuclear magnetic resonance study. I. Solutions in pure solvents , 1975 .

[29]  R. H. Prince,et al.  The mechanism of octahedral complex formation by labile metal ions , 1970 .

[30]  D. C. Douglass,et al.  The Effect of Ions on the Self-Diffusion of Water. I. Concentration Dependence , 1965 .

[31]  D. Irish,et al.  Raman Study of Zinc Chloride Solutions , 1963 .