Crystalline europium bromate, [Eu(H 2 O) 9 ][(BrO 3 ) 3 ], europium ethyl sulfate, [Eu(H 2 O) 9 ][(C 2 H 5 SO 4 ) 3 ], and europium decavanate, [Eu(H 2 O) 8 ] 2 [(V 10 O 28 )]‚8H 2 O, are used as models for nine-and eight-coordinate Eu 3+ aquo species in solution. A comparison of the 5 D 1 r 7 F 0 laser excitation spectra and D 0 f 7 F 1,2 emission spectra of the model crystal systems with that of 0.1 M EuCl 3 (aq) clearly indicates a significant presence of the Eu(H 2 O) 8 3+ species in aqueous solution. Modeling the 0.1 M EuCl 3 (aq) spectra using weighted sums of the eight and nine-coordinate crystal spectra suggest that approximately two-thirds of Eu 3+ ions exist as Eu(H 2 O) 8 3+ in aqueous solution. The current study takes advantage of the symmetry of the Eu(H 2 O) n 3+ complexes and lends further support, from this perspective, that an equilibrium exists between Eu(H 2 O) 8 3+ and Eu(H 2 O) 9 3+ , with significant representation from both species.
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