title: Crystal structure of 2,6-bis-(2-hy-droxy-5-methyl-phen-yl)-4-phenyl-pyridinium bromide di-chloro-methane hemisolvate hemihydrate.
abstract: The asymmetric unit in the structure of the title compound, C25H22NO2 (+)·Br (-)·0.5CH2Cl2·0.5H2O, comprises two pseudosymmetry-related cations, two bromide anions, a di-chloro-methane molecule and a water mol-ecule of solvation. The two independent cations are conformationally similar with the comparative dihedral angles between the central pyridine ring and the three benzene substituent rings being 3.0 (2), 36.4 (1) and 24.2 (1)°, and 3.7 (2), 36.5 (1) and 24.8 (1)°, respectively. In the crystal, the cations, anions and water mol-ecules are linked through O-H⋯O and O-H⋯Br hydrogen bonds, forming an insular unit. Within the cations there are also intra-molecular N-H⋯O hydrogen bonds. Adjacent centrosymmetrically related aggregates are linked by π-π stacking inter-actions between the pyridine ring and a benzene ring in both cations [ring-centroid separations = 3.525 (3) and 3.668 (3) Å], forming chains extending across the ac diagonal. Voids between these chains are filled by dichloromethane molecules.
authors: N.D. Zelinsky Institute of Organic Chemistry, Leninsky prospekt 47, Moscow 119991, Russian Federation; Department of Chemistry, M.V. Lomonosov Moscow State University, Moscow, Russian Federation.
authors: Badma N
authors: BN
authors: Mankaev
authors: N.D. Zelinsky Institute of Organic Chemistry, Leninsky prospekt 47, Moscow 119991, Russian Federation; Department of Chemistry, M.V. Lomonosov Moscow State University, Moscow, Russian Federation.
authors: Kirill V
authors: KV
authors: Zaitsev
authors: N.D. Zelinsky Institute of Organic Chemistry, Leninsky prospekt 47, Moscow 119991, Russian Federation; Department of Chemistry, M.V. Lomonosov Moscow State University, Moscow, Russian Federation.
authors: Sergey S
authors: SS
authors: Karlov
authors: N.D. Zelinsky Institute of Organic Chemistry, Leninsky prospekt 47, Moscow 119991, Russian Federation.
authors: Mikhail P
authors: MP
authors: Egorov
authors: N.D. Zelinsky Institute of Organic Chemistry, Leninsky prospekt 47, Moscow 119991, Russian Federation; Institute of General and Inorganic Chemistry, Russian Academy of Sciences, Moscow, Russian Federation.
authors: Andrei V
authors: AV
authors: Churakov
keywords: ONO-type ligands; crystal structure; hydrogen bonding; pseudosymmetry; π–π stacking