Crystal structure of Nax(MoO)5(P2O7)4 studied by synchrotron X-ray diffraction
(2008) Journal of Alloys and Compounds — Vol. 463, n° 1-2, p. 124-128 (2008)
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- Abstract
- The crystal structure of sodium pentamolybdyl tetradiphosphate Nax(MoO)5(P2O7)4 has been determined from synchrotron diffraction data collected at 293 K on two microcrystals. The compound crystallizes in a monoclinic space group I 1 1 2/a (no. 15, setting 11), with unit cell parameters a = 22.905(3), b = 23.069(2), c = 4.8537(2) Å, γ = 90.641(9)° and a = 22.898(3), b = 23.056(2), c = 4.8551(2) Å, γ = 90.82(1)°, for crystals I and II, respectively. The structure is pseudo-tetragonal, and the crystals are pseudo-merohedrally twinned by 90° rotation around the c-axis. The structure closely resembles the previously reported Li-deintercalated Mo1.3OP2O7 [V.V. Lisnyak, N.V. Stus, P. Popovich, D.A. Stratiychuk, Ya. Filinchuk, V.M. Davydov, J. Alloys Compd. 360 (2003) 81-84]. Comparison of the two structures led us to conclude that the Mo2 and Mo3 clusters were erroneously identified in Mo1.3OP2O7. A revised structure of Mo1.3OP2O7 contains a fully occupied oxygen site instead of the 16% occupied Mo(2) site, thus the revised formulae for the Li-deintercalated compound is (MoO)5(P2O7)4. In both structures, the (MoO)5(P2O7)4 framework strongly resembles the one in the earlier reported Ag(MoO)5(P2O7)4, while the location of Na and Ag atoms differ. © 2007 Elsevier B.V. All rights reserved.
- Affiliations
ESRF, Grenoble (France) Chimie
Citations
Filinchuk, Y., Lisnyak, V. V., Stratiichuk, D. A., & Stus, N. V. (2008). Crystal structure of Nax(MoO)5(P2O7)4 studied by synchrotron X-ray diffraction. Journal of Alloys and Compounds, 463(1-2), 124-128. https://doi.org/10.1016/j.jallcom.2007.09.036 (Original work published 2008)