Ruser, NiklasNiklasRuserBehrens, VanessaVanessaBehrensMeier, ChristophChristophMeierTheissen, JenniferJenniferTheissenSteinke, FelixFelixSteinkeNäther, ChristianChristianNätherGosch, JonasJonasGoschStock, NorbertNorbertStock2026-09-142026-09-1420260044-2313https://imec-publications.be/handle/20.500.12860/60376<jats:p> We report the synthesis and crystal structure of anhydrous cerium(III) acetate [Ce(CH <jats:sub>3</jats:sub> COO) <jats:sub>3</jats:sub> ] ( <jats:bold>1</jats:bold> ) as well as the interconversions to different hydrated phases. The structure determination of <jats:bold>1</jats:bold> was achieved by Rietveld refinement against powder X‐ray diffraction (PXRD). Additionally, the thermal properties of <jats:bold>1</jats:bold> were investigated by thermogravimetry (TG) and variable‐temperature PXRD (VT‐PXRD) and a complete characterization was performed. <jats:bold>1</jats:bold> was prepared by solvothermal treatment of the sesquihydrate [Ce <jats:sub>2</jats:sub> (CH <jats:sub>3</jats:sub> COO) <jats:sub>6</jats:sub> (H <jats:sub>2</jats:sub> O) <jats:sub>2</jats:sub> ]·H <jats:sub>2</jats:sub> O ( <jats:bold>3</jats:bold> ). The dehydration is reversible and <jats:bold>1</jats:bold> can be transformed back to <jats:bold>3</jats:bold> . Using VT‐PXRD the transformation of <jats:bold>3</jats:bold> to <jats:bold>1</jats:bold> was studied. The step‐wise dehydration does not proceed through [Ce(CH <jats:sub>3</jats:sub> COO) <jats:sub>3</jats:sub> (H <jats:sub>2</jats:sub> O)] <jats:bold>(2)</jats:bold> , instead another hitherto unknown metastable cerium(III) acetate hydrate ( <jats:bold>4</jats:bold> ) was observed. It was only possible to determine a sum formula of Ce <jats:sub>2</jats:sub> (CH <jats:sub>3</jats:sub> COO) <jats:sub>6</jats:sub> (H <jats:sub>2</jats:sub> O) <jats:sub>2</jats:sub> for <jats:bold>4</jats:bold> . </jats:p>engJournal article10.1002/zaac.70148WOS:001768675000001LANTHANIDE CARBOXYLATESTHERMAL-DECOMPOSITIONLATTICE-PARAMETERSCRYSTAL-STRUCTUREACETIC-ACIDMETALCOMPLEXESSAMARIUM(III)EUROPIUM(III)PRECURSOR1521-3749