The Reaction Volume for the Equilibrium between the Lanthanide (III) ennea- and octaaqua lons as a diagnostic aid for their water-exchange mechanisms. Preliminary Communication |
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| Authors: | Gabor Laurenezy Andr E Merbach |
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| Institution: | Gabor Laurenezy,André E. Merbach |
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| Abstract: | The equilibrium between Ce(H2O)9]3+ and Ce(H2O)8]3+ has been followed in aqueous solution at 298 K by variable-pressure UV spectroscopy at 295 nm. The dervied volume of reaction for the dissociation of this enneaaqua ion is ΔV0 = +10.9 cm3. mol?1. This value, together with the previously determined activation volume, ΔV≠ = ?6 cm3. mol?1, for H2O exchange on Ln(H2O)8]3+ (Ln = Tb to Tm), allows the assignment of an associative interchange Ia mechanism on these octaaqua ions. |
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