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No pyroanions: The representatives of the lanthanoid(III) fluoride oxidodimolybdates(VI) LnFMo2O7 with the Smaller Cations (Ln = Eu – Yb)
Ist Teil von
Journal of solid state chemistry, 2017-07, Vol.251, p.237-242
Ort / Verlag
Elsevier Inc
Erscheinungsjahr
2017
Link zum Volltext
Quelle
Elsevier ScienceDirect Journals Complete
Beschreibungen/Notizen
The representatives of lanthanoid(III) fluoride oxidodimolybdates(VI) with the formula LnFMo2O7 (Ln = Eu – Yb) occur during reactions of Ln2O3 and LnF3 with MoO3 in 1: 1: 6molar ratio after 6 days in evacuated silica ampoules at 850°C. The title compounds crystallize monoclinically in space group P2/c (a = 421 – 436, b = 651 – 667, c = 1133 – 1140pm and β = 90.4 – 90.6°, Z =2). The crystal structures contain crystallographically unique Ln3+ cations, which are surrounded by two F– and five O2– anions each, forming distorted pentagonal bypramids with the F− anions as apical vertices by which these bipyramids are fused together to strands according to {[LnF2/2vO5/1t]8−}∞1 running parallel to the a axis. The Mo6+ cations show a distorted square-pyramidal coordination environment of five O2− anions. These pyramids are interconnected by common edges and vertices to form chains with the formula {[MoO2/2eO1/2vO2/1t]−}∞1 which are arranged parallel to [001]. Besides the crystal structure determination single crystal Raman spectroscopy was performed and the magnetic behavior of HoFMo2O7 was determined.
Oxidomolybdate chains in the crystal structure of the LnFMo2O7 representatives with contacts to adjacent strands (dashed bonds) [Display omitted]
•Lanthanoid-fluoride dimolybdates without pyroanions.•Tendency for Mo6+ coordination number enlargement.•Extremely short Ln3+−F− distances.•Curie-Weiss behavior for HoFMo2O7.