Add time:08/06/2019         Source:sciencedirect.com

A study of the structures of hydrated and anhydrous lanthanide acetates by X-ray diffraction, i.r. spectra, and absorption spectra demonstrates that there are three separate structures for hydrated lanthanide acetates and four structures for anhydrous acetates. The site symmetry of the lanthanide ion in each structure was shown to be different by comparing the absorption bands due to hypersensitive transitions for Nd3+, Ho3+, or Er3+ in their normal structure and “doped” into other structures.The comparison of band shapes for the hypersensitive transitions allowed the following coordination numbers to be deducede; for the hydrated lanthanide acetates, 8–9 for Structure A (LeCeAc3.32H2O), 8 for Structure B (PrNdAc32H2O), and a coordination intermediate between 6 and 7 for Structure C (SmAc3.4H2O) (Ac = CH3COO−); for anhydrous lanthanide acetates, 9 or greater for Structure I(La, Ce, Pr), 8–9 for Structure II (NdAc3), 7–8 for Structure III (GdAc3HoAc3), and 6–7 for Structure IV (YbAc3). The intermediate lanthanide acetates were dimorphic. Polymeric, bidentate, and monodentate acetate were inferred from lanthanide ion coordination and distinguished by i.r. spectra.

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