A triclinic polymorph of dicadmium divanadate(V)

The title compound, Cd₂V₂O₇, was obtained under hydro­thermal conditions. Different from the known monoclinic form, the new polymorph of Cd₂V₂O₇ has triclinic symmetry and is isotypic with Ca₂V₂O₇. The building units of the crystal structure are two Cd²⁺ cations, with coordination numbers of six and seven, and two V atoms with a tetra­hedral and a significantly distorted trigonal-pyramidal coordination environment, respectively. Two VO₅ pyramids share an edge and each pyramid is connected to one VO₄ tetra­hedron via a corner atom, forming an isolated V₄O₁₄^8- anion. These anions are arranged in sheets parallel to (-211) and are linked through the Cd²⁺ cations into a three-dimensional framework structure.

2-Allyl-7-nitro-2H-indazole

The asymmetric unit of the title compound, C₁₀H₉N₃O₂, contains two independent mol­ecules linked by a C—H...N hydrogen bond. Each mol­ecule has a similar conformation, being built up from fused five- and six-membered rings, each linked to an ally and nitro group, respectively. The indazole ring system makes dihedral angles of 2.7 (2) and 2.2 (2)°, respectively, with the plane through the nitro group. The allyl group is nearly perpendicular to the indazole system, as indicated by the N—N—C—C torsion angles of −75.3 (2) and −82.2 (2)°, this being the most important difference between the conformations of the two mol­ecules. In the crystal, mol­ecules are linked by C—H...O and π–π [inter-centroid distance = 3.6225 (8) Å] inter­actions to form a three-dimensional network.

N-(3-Chloro-1H-indazol-5-yl)-4-meth­oxy­benzene­sulfonamide

In the title compound, C₁₄H₁₂ClN₃O₃S, the fused five- and six-membered rings are folded slightly along the common edge, forming a dihedral angle of 3.2 (1)°. The mean plane through the indazole system makes a dihedral angle of 30.75 (7)° with the distant benzene ring. In the crystal, N—H...O hydrogen bonds link the mol­ecules, forming a two-dimensional network parallel to (001).

4-Benzyl­sulfanyl-1H-pyrazolo­[3,4-d]pyrimidine

The pyrazolo­[3,4-d]pyrimidine ring system of the title compound, C₁₂H₁₀N₄S, is essentially planar [maximum deviation = 0.025 (1) Å for the C atom bearing the S atom] and almost perpendicular to the phenyl ring [dihedral angle = 71.42 (6)°]. In the crystal, mol­ecules are linked via pairs of N—H...N hydrogen bonds, forming inversion dimers.

N-(1H-Indazol-5-yl)-4-meth­oxy­benzene­sulfonamide

In the title compound, C₁₄H₁₃N₃O₃S, the fused ring system is almost planar, the largest deviation from the mean plane being 0.023 (2) Å, and makes a dihedral angle of 47.92 (10)° with the benzene ring of the benzene­sulfonamide moiety. In the crystal, mol­ecules are connected through N—H...O hydrogen bonds and weak C—H...O contacts, forming a two-dimensional network which is parallel to (010).