Hydration and complex formation study on concentrated MCl2 solutions [M=Co(II), Ni(II), Cu(II)] by x-ray diffraction technique
- 15 February 1981
- journal article
- Published by AIP Publishing in The Journal of Chemical Physics
- Vol. 74 (4) , 2523-2529
- https://doi.org/10.1063/1.441322
Abstract
Concentrated aqueous chloride solutions containing equal amounts of transition metal ions of almost equal ionic radii (Co2+, Ni2+ and Cu2+) have been examined by the x‐ray diffraction technique. CoCl2 and Nicl2 solutions show distribution curves very similar to each other which leads to the conclusion that the same dominant species should occur in both systems. The analysis of the structure functions can be achieved by considering M(H2O)2+6 (M=Co2+, Ni2+) as the dominant species although indication is given in favor of the presence of about 50% of the M(H2O)5Cl+ complex [and the rest M(H2O)2+6] in both solutions. The distribution curve of CuCl2 solution is markedly different from those of cobalt and nickel. Equatorial positions, in the distorted octahedral copper coordination are, on the average, occupied by about 2.8 water molecules (at 1.95 Å) and about 1.2 chloride ions (at 2.25 Å). Occupancy of the axial copper positions is discussed, though no unique conclusion can be obtained with respect to this point from the scattering data.Keywords
This publication has 31 references indexed in Scilit:
- X-ray diffraction study of concentrated chromium (III) chloride solutions. I. Complex formation analysis in equilibrium conditionsThe Journal of Chemical Physics, 1980
- X-ray diffraction study of ferric chloride solutions and hydrated melt. Analysis of the iron (III)–chloride complexes formationThe Journal of Chemical Physics, 1979
- Solute structuring in aqueous iron(III) sulphate solutions. Evidence for the formation of iron(III) –sulphate complexesThe Journal of Chemical Physics, 1979
- An X-ray investigation on the structure of iron(III) perchlorate solutionsJournal of Inorganic and Nuclear Chemistry, 1978
- The hydration of Ni2+in aqueous solutionsJournal of Physics C: Solid State Physics, 1978
- On the structure of highly concentrated iron(III) salt solutionsJournal of Inorganic and Nuclear Chemistry, 1977
- X-ray diffraction and structure of NiCl2 aqueous solutionsFaraday Discussions of the Chemical Society, 1977
- X-Ray Diffraction Study of Some Concentrated Cobalt(II) Chloride SolutionsThe Journal of Chemical Physics, 1969
- The Crystal Structure of Nickel Chloride Hexahydrate, NiCl2·6H2OJournal of the Physics Society Japan, 1961
- An X-ray Study on the Structure of Cobalt Dichloride HexahydrateJournal of the Physics Society Japan, 1960