Sn(SO₄)₂·2H₂O from synchrotron powder data

Tin(IV) sulfate dihydrate comprises of (100) layers of [SnO₄(H₂O)₂] octa­hedra corner-connected by sulfate tetra­hedra, and with O—H⋯O hydrogen-bonding between the layers.

1-[(2-Chloro­phen­yl)di­phenyl­meth­yl]-1H-pyrazole

The title compound C₂₂H₁₇ClN₂, also named as TRAM-34, crystallizes in the monoclinic space group P2₁/n. The dihedral angles between the pyrazole ring and the three six-membered rings are 62.28 (9), 69.48 (9) and 71.30 (9)°.

rac-2-{3-[1-(Acet­yloxy)eth­yl]-2,2-di­methyl­cyclobut­yl}acetic acid

The title compound was prepared from α-pinene in three steps. The ester and acid moieties are cis on the slightly folded cyclo­butane ring. In the crystal, carb­oxy­lic acid bound dimers form layers parallel to (202).

3-(2-Hy­droxy­eth­yl)-1-(4-nitro­phen­yl)-1H-benzo[d]imidazol-3-ium bromide

In the crystal of the title salt, the bromide ions act as double acceptors for hydrogen bonds from a hydroxyl group (O—H⋯Br) and a fused imidazolium moiety (C—H⋯Br). Additionally, C—H⋯O hydrogen bonds between the phenyl group and hydroxyl oxygen atom create a two-dimensional supra­molecular network extending diagonally in the crystallographic bc plane.