Bis(3,5-di-tert-butyl-4H-1,2,4-triazol-4-amine-κN¹)(nitrato-κO)silver(I) ethanol monosolvate monohydrate

The Ag^I atom in the title compound, [Ag(NO₃)(C₁₀H₂₀N₄)₂]·C₂H₅OH·H₂O, is coordinated by the N atoms of two N-heterocycles [N—Ag—N = 151.5 (1)°]; the approximately linear coordination geometry is distorted into a T-shaped geometry owing to a long Ag...O_nitrate bond [2.717 (4) Å]. The N atoms of the N-heterocycles that are not involved in coordination point towards the lattice water mol­ecule, which functions as a hydrogen-bond donor. The water mol­ecule itself is a hydrogen-bond acceptor towards the ethanol solvent mol­ecule. Hydrogen bonds of the type N–H...O give rise to a layer motif parallel to (001).

catena-Poly[[tetra­aqua­nickel(II)]-μ-(9,10-dioxo-9,10-dihydro­anthracene-1,4,5,8-tetra­carboxyl­ato)-κ²O¹:O⁸-[tetra­aqua­nickel(II)]-μ-4,4′-bipyridine-κ²N:N′]

In the crystal of the title polymeric complex, [Ni₂(C₁₈H₄O₁₀)(C₁₀H₈N₂)(H₂O)₈]_n, each Ni^II cation is coord­in­ated by four water mol­ecules in the equatorial plane, and is further bridged by an 9,10-dioxo-9,10-dihydro­anthracene-1,4,5,8-tetra­carb­oxy­l­ate anion and a 4,4′-bipyridine ligand in the axial directions, forming a distorted octa­hedral geometry. The 9,10-dioxo-9,10-dihydro­anthracene-1,4,5,8-tetra­carboxyl­ate anion is centrosymmetric with the centroid of the quinone ring located about an inversion center; the 4,4′-bipyridine ligand is also centrosymmetric with the mid-point of the C—C bond linking two pyridine rings located about another invertion center. The 9,10-dioxo-9,10-dihydro­anthracene-1,4,5,8-tetra­carboxyl­ate anion and bypiridine ligand bridge the Ni^II cations, forming a polymeric chain along the b axis. π–π stacking is observed between pyridine and benzene rings [centroid–centroid distance = 3.705 (2) Å]. All of the coordinating water mol­ecules are involved in O—H...O hydrogen bonding.

4-(4,5-Dihydro-1H-benzo[g]indazol-3-yl)pyridinium chloride dihydrate

In the cation of the title compound, C₁₆H₁₄N₃⁺·Cl⁻·2H₂O, the cyclo­hexa-1,3-diene ring displays a screw-boat conformation and the pyridine ring is slightly twisted with respect to the pyrazole ring with a dihedral angle of 4.56 (12)°. In the crystal, ions and water mol­ecules are linked into a three-dimensional network by classical N—H...O, N—H...Cl, O—H...Cl and O—H...O hydrogen bonds and by π–π stacking inter­actions, with centroid–centroid distances of 3.7580 (14) and 3.7794 (14) Å.