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Issue 37, 2014
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Synthesis, crystal structure and spectroscopic properties of a novel yttrium(iii) fluoride dimolybdate(vi): YFMo2O7

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Abstract

Thermal treatment of a mixture of Y2O3, YF3 and MoO3 in a 1 : 1 : 6 molar ratio at 850 °C in evacuated silica ampoules yielded colorless, platelet-shaped single crystals of YFMo2O7. SiO2 was dissolved from the ampoule wall in small amounts, but could be removed from the crude product by treatment with hydrofluoric acid (20%). The title compound crystallizes monoclinically in the space group P2/c with two formula units per unit cell with the dimensions a = 4.2609(2), b = 6.5644(4), c = 11.3523(7) Å, and β = 90.511(2)°. Its crystal structure contains crystallographically unique Y3+ cations in a pentagonal bipyramidal environment consisting of two F anions in the apical positions and five O2− anions in the equatorial positions. These polyhedra are connected to 1{[YFv2/2Ot5/1]8−} chains along [100] by sharing common F vertices. The likewise crystallographically unique Mo6+ cations exhibit a coordination number of five and reside in the centers of distorted square pyramids built up of oxide anions. These entities are fused to chains along [001] by sharing common edges and vertices according to 1{[MoOe2/2Ov1/2Ot2/1]}. Taking a sixth oxygen ligand further away from the Mo6+ cations into account, the aforementioned chains assemble to corrugated 2{[MoOe2/2Ov3/2Ot1/1]} layers perpendicular to [010] with the 1{[YFv2/2Ot5/1]8−} chains situated between these sheets. Since Y3+ represents a non-luminescent rare-earth metal(III) cation, YFMo2O7 is a suitable host material for doping with luminescence-active lanthanoid(III) cations, such as Eu3+.

Graphical abstract: Synthesis, crystal structure and spectroscopic properties of a novel yttrium(iii) fluoride dimolybdate(vi): YFMo2O7

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Publication details

The article was received on 10 Apr 2014, accepted on 28 Jul 2014 and first published on 29 Jul 2014


Article type: Paper
DOI: 10.1039/C4DT01066C
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Dalton Trans., 2014,43, 14016-14021

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    Synthesis, crystal structure and spectroscopic properties of a novel yttrium(III) fluoride dimolybdate(VI): YFMo2O7

    I. Hartenbach, H. A. Höppe, K. Kazmierczak and T. Schleid, Dalton Trans., 2014, 43, 14016
    DOI: 10.1039/C4DT01066C

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