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Temperature dependence of electronic absorption spectra of nitrate ion and of some transition metal cations in aqueous solutions

In this work we present the study of temperature influence on the other band in the UV spectrum of NO_3^-(aq)centred at 200 nm. We also studied temperature effect on the d-d transitions of Ni^+2(aq) at different concentrations in the temperature range of (10...70)°C. Significant influence of temperature on the position and intensity of the corresponding spectral bands, accompanied with the occurence of well-defined isosbestic points, was observed. Analogously to the case of nitrate ion, these spectral changes could be explained by temperature dependent breaking/formation of hydrogen bonds in the cation hydration shell.

temperature dependence ; electronic absorption ; nitrate ion ; cations ; aqueous solutions

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