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Figure 6
a3-Fe2P2O7 (C1, Z = 2). Crystal structure with schematic polyhedra [Fe(II)O6] (blue) and P2O74− groups (yellow) (a) viewed along [010] and (b) as a projection onto (001); atoms given as spheres of arbitrary radius; the unit cell is indicated in red. ORTEP style representations of the polyhedra from refinement of the bridging oxygen atom O4 (c) on a single site and (d) with split sites; ellipsoids are given at the 50% probability level; symmetry codes refer to Table 4[link]. [Additional symmetry codes; (vii) x, y, z − 1; (viii) −x + 1, −y, −z; (ix) −x + 1, −y, −z − 1; (x) x + ½, y + ½, z; (xi) −x + ½, −y + ½, −z − 1]. Note the monoclinic pseudo-symmetry, notably a pseudo-reflection plane parallel to (010) passing through the P2O74− unit.

IUCrJ
Volume 12| Part 6| November 2025| Pages 670-682
ISSN: 2052-2525
https://doi.org/10.1107/S2052252525007547