(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.

(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.