(2,2′-Bipyridine-κ²N,N′)[bis­(diphenyl­thio­phosphino­yl)meth­yl]lithium(I) benzene monosolvate

In the title benzene-solvated heteroleptic lithium complex, [Li(C₂₅H₂₁P₂S₂)(C₁₀H₈N₂)]·C₆H₆, the Li^I ion is four-coordinated in a distorted tetra­hedral geometry by two S atoms and two N atoms of the two chelating ligands, viz. bis­(diphenyl­thio­phosphino­yl)methyl and 2,2′-bipyridine. The 2,2′-bipyridine mol­ecule is slightly twisted with a dihedral angle between the pyridine rings of 7.35 (12)°. Intra­molecular C—H...S hydrogen bonds are present. In the crystal, mol­ecules are stacked along the c axis by π–π inter­actions, with centroid–centroid distances of 3.6021 (15) and 3.6401 (16) Å. The crystal structure also features weak C—H...π inter­actions.

Bis­(3,5-diamino-4H-1,2,4-triazol-1-ium) 3,4-dioxocyclo­butane-1,2-diolate

The asymmetric unit of the title compound, 2C₂H₆N₅⁺·C₄O₄²⁻, contains two 3,5-diamino-4H-1,2,4-triazolium cations and one squarate dianion. The squaric acid mol­ecule donated one H atom to each of the two 3,5-diamino-1,2,4-triazole mol­ecules at their N atoms. The squaric acid dianion has four C—O bonds which are shorter than a normal single C—O bond (1.426 Å) and are slightly longer than a normal C=O bond (1.23 Å), which indicates the degree of electron delocalization in the dianion. In the crystal, the cations and dianions are linked by N—H...N and N—H...O hydrogen bonds into a three-dimensional network.

(Z)-N-[2-(N′-Hy­droxy­carbamimido­yl)phen­yl]acetamide

The asymmetric unit of the title compound, C₉H₁₁N₃O₂, contains two mol­ecules (A and B), which exist in Z conformations with respect to their C=N double bond. The dihedral angles between the benzene ring and the pendant hy­droxy­carbamimidoyl and acetamide groups are 28.58 (7) and 1.30 (5)°, respectively, in mol­ecule A and 25.04 (7) and 27.85 (9)°, respectively, in mol­ecule B. An intra­molecular N—H...N hydrogen bond generates an S(6) ring in both mol­ecules. Mol­ecule A also features an intra­molecular C—H...O inter­action, which closes an S(6) ring. In the crystal, the mol­ecules are linked by N—H...O, N—H...N, O—H...O, O—H...N, C—H...O and C—H...N hydrogen bonds and C—H...π inter­actions, generating a three-dimensional network.

(E)-2-[4-(Diethyl­amino)­styr­yl]-1-ethyl­pyridinium iodide monohydrate

In the title hydrated salt, C₁₉H₂₅N₂⁺·I⁻·H₂O, the 4-(diethyl­amino)­phenyl unit of the cation is disordered over two positions in a 0.847 (3):0.153 (3) ratio. The cation is twisted, with dihedral angles between the pyridinium and benzene rings of 11.25 (13) and 10.7 (8)° for the major and minor components, respectively. In the crystal, the three components are linked into a centrosymmetric 2:2:2 unit by O—H...I and C—H...O hydrogen bonds. π–π inter­actions with centroid–centroid distances of 3.5065 (7)–3.790 (9) Å are also present.