Dimere und Ketten in Praseodym(III)acetat-sesquihydrat, Pr(CH3COO)3·1,5 H2O / Dimers and Chains in Praseodymium(III)acetate-sesquihydrate, Pr(CH3COO)3 · 1.5 H2O

Pr(CH3COO)3· 1.5 H2O crystallizes with the triclinic system, P̄1̄ (no. 2), Z = 4, a = 844.2(4), b = 1009.8(5), c = 1340.1(7) pm, α = 87.10(5), β = 76.25(6), y = 75.65(2)°, Vm = 161.9(1) cm3/mol, R = 0.049, Rw = 0.035. The crystal structure contains centrosymmetric dimers {[Pr(CH3COO)4(H2O)]-}2 and one-dimensional chains ∞ 1[Pr(CH3COO)2(H2O)]+ along the [100] direction. Both units are built up by bridging acetate groups. The chains are linked by the dimers to layers parallel (101) sharing oxygen atoms. Crystal water molecules between these planes form hydrogen bonds to neighbouring layers.