INFRARED AND RAMAN SPECTRA OF VARIABLY HYDRATED ZINC NITRATE SOLUTIONS.
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Date
1967
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Ohio State University
Abstract
Infrared and Raman spectra of liquids of composition $Zn(NO_{3})_{2}xH_{2}O$, with x having values from infinity to 1.42, have been obtained. The changing form of the spectra will be given as a function of both composition and temperature. The concentration dependence of the spectra shows that the nitrate ions become increasingly associated with the zine ions as water is removed, until at very low water content, no uncomplexed nitrate ions remain. Nearly anhydrous liquid zinc nitrate is thus shown to be a non-electrolyte. All the results can be interpreted in terms of inner-sphere coordinated water molecules being displaced by nitrate ions binding in a monodentate fashion. In compositions with less than four water molecules per zinc ion the coordination number of zinc must drop below six. The temperature dependence of the spectra verifies the fact that perturbation of the oxyanion is caused primarily by water-oxyanion interactions in compositions of high water content and by cation-oxyanion interactions in compositions of low water content.
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Author Institution: Department of Chemistry, Middlebury College; Department of Chemistry, University of York