The reaction volume for the equilibrium between the lanthanide(III) ennea- and octaaqua ions as a diagnostic aid for their water-exchange mechanisms

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 ΔV 0 = +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 I a mechanism on these octaaqua ions.


Published in:
Helvetica Chimica Acta, 71, 8, 1971-1973
Year:
1988
Laboratories:




 Record created 2006-02-15, last modified 2020-10-27


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