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| - Raman Study of the Coordination Structure of a Rare Earth−Acetate Complex in Water
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| Abstract
| - The Raman spectra of aqueous LnCl3·20H2O·CH3COOLi (LnCl3, rare earth chloride) solutions have beenmeasured in the liquid state. The change of the Raman symmetric Ln3+−OH2 stretching band (νw) showedthat the decrease in the ionic radius of rare earth (Ln3+) ions induces a change in coordination number of theLn3+ ion. The two peaks at 946 and 958 cm-1 of the C−C stretching band (νCC) of the acetate ion are assignedto the bidentate ligand and the polymeric chain structure, respectively. The coordination structure of theacetate ion to Ln3+ ion prefers the bidentate ligand to the polymeric chain structure throughout the rare earthseries. The fraction of the bidentate ligand increases with decreasing ionic radius of the Ln3+ ion. On thebasis of the analyses of the νw and νCC bands, the change in the coordination number of the Ln3+ ion ismainly due to the structural change (from the polymeric chain structure to the bidentate ligand) of the Ln3+−acetate complex rather than a elimination of one water molecule. Our results show that the Ln3+ ions tend toform the bidentate ligand rather than the divalent (M2+) ions.
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