Intermediate range order in concentrated aqueous solutions of copper nitrate. X-ray diffraction and Raman investigations

✍ Scribed by M. Alves Marques; M.I. de Barros Marques; M. Isabel Cabaço; A.M. Gaspar; M.L. de Almeida

• Publisher: Elsevier Science
• Year: 2004
• Tongue: English
• Weight: 297 KB
• Volume: 110
• Category: Article
• ISSN: 0167-7322
• DOI: 10.1016/j.molliq.2003.08.014

✦ Synopsis

Concentrated aqueous solutions of copper nitrate of different concentrations (0.66 mol dm up to 4.84 mol dm ) have been

investigated by X-ray diffraction at room temperature. In these solutions a maximum of intensity (prepeak) is observed at low values of Q (approx. 0.6 to 1 A ) suggesting the existence of an intermediate range order in their structure, in agreement with y1 previous investigations on different electrolytes. In order to get information on the solvation shell of the copper cation, Raman spectroscopy experiments have been performed for the more concentrated solution. Polarization observations, isotopic substitution of the solvent and the comparison with a Raman spectrum of a concentrated aqueous solution of aluminum nitrate were performed in order to improve the interpretation of the obtained results with these convergent observations.