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Figure 5
(a) The H2P2O62− and HP2O63− anions in (IV), joined via O—H⋯O hydrogen bonds (blue dashed lines in the electronic version of the paper) to form layers parallel to (010). (b) The [KO8] polyhedra based on K1 (dark blue), K2 (light blue) and K3 (grey) are arranged within double layers parallel to the (100) plane. Water-bridged hydrogen bonds (orange dashed lines) between adjacent anionic layers are also shown. [Symmetry codes: (ii) −x + 1, −y + 1, −z + 1; (vi) −x + 2, y, −z + [{3\over 2}]; (vii) x, −y + 1, z + [{1\over 2}]; (x) −x + 2, y + 1, −z + [{3\over 2}].]

Journal logoSTRUCTURAL
CHEMISTRY
ISSN: 2053-2296
Volume 68| Part 12| November 2012| Pages i71-i82
doi:10.1107/S010827011204317X
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