Cover illustration: A view of part of the structure of catena-poly[[di-2-hydroxido-bis[dioxouranium(VI)]]-di-2-2-pyridylacetato], showing the atom-numbering scheme. Displacement ellipsoids are drawn at the 50% probability level. Hydrogen bonds are shown as dashed lines. See Thuéry [Acta Cryst. (2008), C64, m50-m52].
The structures of K3Ga2(PO4)2 and Na3Ga(PO4)3 are shown to contain irregular one-dimensional alkali-ion-containing channels and anionic subsystems consisting of vortex-linked PO4 tetrahedra and GaO4 tetrahedra or GaO5 trigonal bipyramids.