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The Sn6O4(OH)4 clusters which form the structure pack in a pseudo-body-centered fashion. The Sn atoms have distorted tetragonal pyramidal coordination geometry; each Sn atom is coordinated to two bridging O atoms and two bridging hydroxy O atoms.



In SrBr2.6H2O, Sr has tricapped trigonal prismatic coordination geometry involving six bridging and three terminal water molecules, resulting in a linear polymeric cation of general formula [Sr(H2O)6]n2n+ with charges balanced by Br- ions.


The structure of Ni(SnF3)2.6H2O contains discrete trigonal pyramidal [SnF3]- complex anions and [Ni(H2O)6]2+ complex cations in a 2:1 ratio. The structure is unusual in that it shows no evidence of the polymeric bridging common in stannous fluorides.


Molecules of the title compound, C10H8N2Se2, stack in a one-dimensional ladder configuration, with relatively short Se
N interactions between neighbours.


The structure of the perovskite compound La(Zn1/2Ti1/2)O3 is monoclinic, space group P21/n. The B site is ordered on {110}, but the presence of the pseudocubic
(111) reflection is insufficient by itself to indicate the existence of such order.
