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Complex Formation in an Aqueous ZnBr2 Solution Based on Electron Diffraction, X-ray Scattering and Raman Spectra

Abstract Electron and X-ray scattering as well as Raman spectra of as aqueous solution of ZnBr2 with a Br-/Zn++ ratio of 3:1 have been studied. The existence of hexaaquo, di-, tri-and tetra-bromo complexes in solution has been established by all three methods. Octahedral hexaaquo and tetrahedral Zn(H2O)4-n Brn complexes with n=2, 3, 4 are consistent with electron and X-ray structure functions. The inner sphere type complexes have interatomic distances of 2.2 Å for Zn++ -H2O, 2.4 Å for Zn++ -Br-, 3.93 Å for Br--Br- and 2.91 Å for W-W interactions with average numbers of contacts 2.4, 2.22, 1.33 and 1.1 respectively.