Dimere und Ketten in Praseodym(III)acetat-sesquihydrat, Pr(CH3COO)3l, 5H20

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

CsPr2(CH3COO)7, ein caesiumarmes wasserfreies ternäres Caesium-Praseodym-Acetat

Single crystals of CsPr2(CH3COO)7 were obtained from an acetic acid solution of Pr(CH3COO)3 • H2O and Cs2CO3 in a molar ratio of 4:1 at 120°C. It crystallizes in the triclinic system, PĪ (no. 2), Z = 2, a = 1028.1(5), b = 1034.6(5), c = 1199.4(6) pm, α = 84.82(2), β = 67.07(3), γ = 76.01(2)°, Vm = 343.3(3) cm3/mol, R = 0.031, Rw = 0.027. The crystal structure contains infinite chains, 1∞[Pr2(CH3COO)6], running along the [110] direction. The chains are built up by bridging acetate ions coordinated to two crystallographically different Pr3+ ions which are both surrounded by 9 oxygen ligands. These chains are linked by “intercalated” Cs(CH3COO) to layers parallel (100). Cs+ has contacts to oxygen atoms of neighbouring layers, such that a three-dimensional network is formed

[Sm(CH3COO)3 (H2O)2] · CH3COOH, ein Essigsäureaddukt des Samarium(III)-acetatdihydrate

The crystal structure of the acetic acid adduct of the so far unknown samarium(III) acetate dihydrate was determined from single-crystal four-circle diffractometer data. It has the composition [Sm (CH3COO)3(H2O)2] CH3COOH containing {[Sm(CH3COO)3(H2O)2]}2 dimers and crystallizes in the trigonal system, R3̄̄̄̄, a = 2695.1(3), c = 1030.8(4) pm, Vm = 216.97(5) cm3/mol, R = 0.041, Rw = 0.030