In this work, a thin-film UV–visible spectroscopic technique has been developed and combined with timedependent density functional theory (TD-DFT) calculations for the study of the chemical speciation in concentrated aqueous solutions of Cu(II) + Cl−. When the CuCl2 concentration changed from 0.05 mol·kg−1 to 5 mol·kg−1, the UV peak shifted from~250 nmto ~262 nm. Similar shiftswere recorded for CuCl2 solutions containing up to 5 mol·kg−1 NaCl. Combination of the spectral datawith our previous TD-DFT calculations provided a consistentmodel of the chemical speciation in the Cu(II)/Cl− systemup to high concentrations of both components. The results obtained indicate that many of the previous conclusions regarding these solutions, drawn from
a variety of techniques are unreliable. Under the present conditions, the only species detected were innersphere complexes with one or two Cl− ions bound to the aquated Cu(II) ion. For all the solutions, no remarkable peaks at ~280 nm or 380 nm, indicative of CuCl3 − (aq) and CuCl4 2− (aq) respectively, were observed.
In this work, a thin-film UV–visible spectroscopic technique has been developed and combined with timedependent density functional theory (TD-DFT) calculations for the study of the chemical speciation in concentrated aqueous solutions of Cu(II) + Cl−. When the CuCl2 concentration changed from 0.05 mol·kg−1 to 5 mol·kg−1, the UV peak shifted from~250 nmto ~262 nm. Similar shiftswere recorded for CuCl2 solutions containing up to 5 mol·kg−1 NaCl. Combination of the spectral datawith our previous TD-DFT calculations provided a consistentmodel of the chemical speciation in the Cu(II)/Cl− systemup to high concentrations of both components. The results obtained indicate that many of the previous conclusions regarding these solutions, drawn froma variety of techniques are unreliable. Under the present conditions, the only species detected were innersphere complexes with one or two Cl− ions bound to the aquated Cu(II) ion. For all the solutions, no remarkable peaks at ~280 nm or 380 nm, indicative of CuCl3 − (aq) and CuCl4 2− (aq) respectively, were observed.
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