A new polymorph of bis­[2,6-bis­(1H-benzimidazol-2-yl-κN³)pyridinido-κN]zinc(II)

The title compound, [Zn(C₁₉H₁₂N₅)₂], crystallizes in the tetra­gonal space group P4₃2₁2, with the monomer residing on a twofold axis. The imidazole N-bound H atoms are disordered over the two positions, with refined occupancies of 0.59 (3) and 0.41 (3). The strong similarities to, and slight differences from, a reported P4₂2₁2 polymorph which has a 50% smaller unit-cell volume [Harvey, Baggio, Muñoz & Baggio (2003). Acta Cryst. C59, m283–m285], to which the present structure bears a group–subgroup relationship, are discussed.

An anisaldehyde sodium bis­ulfite derivative: poly[[μ₄-(hy­droxy)(4-meth­oxy­phenyl)methane­sulfonato]­sodium]

The title complex, [Na(C₈H₉O₅S)]_n, is polymeric and consists of broad layers parallel to (100) made up of an inner hydro­philic core of Na⁺ cations and polar SO₃C(OH)– groups, padded on both sides by two hydro­phobic layers of pendant meth­oxy­phenyl groups. The Na⁺ cations in the inner core are six-coordinated into highly distorted NaO₆ octa­hedra by four symmetry-related (hy­droxy)(4-meth­oxy­phenyl)methane­sul­fon­ate anions, leading to a tightly woven two-dimensional structure. While there are some hydrogen bonds providing inter­planar cohesion, inter­actions between adjacent layers are weak hydro­phobic ones. The present compound appears to be the first reported structure containing the (hy­droxy)(4-meth­oxy­phenyl)methane­sulfonate ligand.

3,5-Dimethyl-4-[(E)-(2-nitro­phenyl)diazenyl]-1-(2,3,4,5,6-penta­fluoro­phenyl)-1H-pyrazole

The title compound, C₁₇H₁₀F₅N₅O₂, is described and com­pared with its 4-nitro­phenyl isomer [Bustos, Sánchez, Schott, Alvarez-Thon & Fuentealba (2007). Acta Cryst. E63, o1138–o1139]. The title mol­ecule presents its nitro group split into two rotationally disordered components, which in conjunction with the rotation of the `unclamped' rings constitute the main mol­ecular differences. Packing is directed by a head-to-tail type `I' C—F...F—C inter­action, generating double-chain strips running along [100]. These substructures are inter­linked by a variety of weak F...F, O...F, F...π and O...π inter­actions.