Distrontium oxalate tetra­hydroxidocuprate(II)

Sr₂Cu(OH)₄(C₂O₄) is made up from edge-sharing {SrO₄(OH)₄} polyhedra decorated by {Cu(OH)₄} units and oxalate groups.

2,2,2-Tri­fluoro­ethyl 5-methyl-1H-pyrazole-3-carboxyl­ate

The title compound, which exhibits disorder over the terminal tri­fluoro­methyl and methyl entities, is close to planar with the r.m.s. deviation for the non-H/-F atoms being 0.038 Å. In the crystal, the mol­ecules are linked by N—H⋯N inter­actions into a [010] chain with a C₁¹(3) motif.

5-{4-[(1R,3S,4S)-Neomenth­yloxy]phen­yl}-1H-tetra­zole

The monoclinic unit cell of the title compound contains four mol­ecules, two A and two B. In the extended structure, the two similar conformers are connected into A-ribbons and B-ribbons. Three hydrogen bonds connect the mol­ecules within the ribbons, while π–π inter­actions between the phenyl and tetra­zole moieties of different mol­ecules connect the A and B strands; the aromatic rings are nearly coplanar.

3,14-Diselena-4,5,12,13-tetra­aza­tri­cyclo­[9.3.0.0^2,6]tetra­deca-1(11),2(6),4,12-tetra­ene

A third isomer of cyclooctenobis-1,2,3-selenadiazoles is reported. The mol­ecule is located on a twofold rotation axis and the eight-membered ring adopts a twist-chair conformation with planar heterocycles.

N-(3,5-Di­chloro-4-hy­droxy­phen­yl)acetamide

The title compound contains three mol­ecules in the asymmetric unit linked by numerous hydrogen bonds.

4-Acetamido-3-chloro­phenyl acetate

In the title compound, the dihedral angles between the chloro­benzene ring and the acetamide and acetate planes are 40.70 (8) and 88.07 (8)°, respectively; the acetamide and acetate planes make a dihedral angle of 51.39 (9)°. In the extended structure, the mol­ecules are linked by N—H⋯O hydrogen bonds involving the acetamide group, forming C(4) chains propagating along the [010] direction.