March 1996 issue
In both (N2H5)3[GaF6] and (N2H6)[GaF5(H2O)], the six-coordinate Ga atoms are arranged in a distorted f.c.c. fashion. Extensive hydrogen bonding of the type N-H⋯F stabilizes the structures.
The structure of Cu3Er(SeO3)2O2Cl, the Er analogue of francisite [Cu3Bi(SeO3)2O2Cl], is reported. Differences in the M3+ coordination geometries in the two compounds are discussed.
The structure of Cd3[Ir(CN)6]2.12H2O (space group Fm3m) is disordered. The divalent Cd atoms are linked to Ir atoms by linear cyanide bridges; the disorder is such that one-third of the Ir atoms and cyanide bridges are replaced by water molecules.