Abstract
AbstractThe reactions of Bi(NO3)3·5H2O or Sm(NO3)3·6H2O with oleum (65 % SO3 in conc. H2SO4) and the pyridine (Py) complex Py·SO3 in the ionic liquid 1‐butyl‐3‐methylimidazolium hydrogen sulfate, [bmim][HSO4], yielded single crystals of (C5H6N)Bi(S2O7)2 and (C5H6N)3Sm(S2O7)3, respectively. In (C5H6N)3Sm(S2O7)3 the Sm3+ cations are ninefold coordinated by oxygen atoms in the form of a tricapped trigonal prism. The oxygen atoms belong to six chelating and six monodentate disulfate units. The anions connect the Sm3+ ions to chains according to 1∞[Sm(S2O7)6/2]3– along the crystallographic c‐axis. In (C5H6N)Bi(S2O7)2 the two crystallographic independent Bi3+ cations are in a distorted square‐prismatic oxygen coordination of eight oxygen atoms belonging to four chelating disulfate units. The connection of the Bi3+ ions leads to a corrugate layer according to 2∞[Bi(S2O7)4/2]–. In both compounds charge compensation is achieved by pyridinium cations (C5H6N)+, which are tilted towards each other and packed in a layered arrangement between the anionic units. Thermoanalytical investigations reveal the sesquioxide Sm2O3 as a residual product for the decomposition of (C5H6N)3Sm(S2O7)3.
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