Lidiya Izotova

A new polymorph of N-phenyl-phthalimide.

During an attempt to prepare a cocrystal of N-phenylphthalimide, C14H9NO2, with N-(2,3,4,5,6-pentafluorophenyl)phthalimide, a new orthorhombic polymorph of the first component was obtained. This new form has Z′ = 0.5 and the molecule is located around a twofold axis, whereas in the previously reported polymorph (space group Pbca), the molecule has no crystallographically imposed symmetry. Pairs of C—H⋯O interactions between inversion-related phthalimide units arrange molecules into tapes that are further assembled into (010) layers via stacking interactions between phthalimide fragments [interplanar distance = 3.37 (5) Å].

2,2'-Bis(9-hydr-oxy-9-fluoren-yl)biphen-yl-ethyl acetate (1/1).

In the title host–guest compound, C38H26O2·C4H8O2, the ethyl acetate molecule (guest), which adopts a fully extended conformation, and the biphenyl derivative (host) are connected via O—H⋯O hydrogen bonds [H⋯O = 1.90 (3) Å] into discrete assemblies. The hydrocarbon skeleton of the host molecule deviates only slightly from C2 symmetry. The OH groups of the host are involved in intramolecular O—H⋯O hydrogen bonding [H⋯O = 1.83 (3) Å].

1,1′-Binaphthyl-2,2′-dicarboxylic acid–urea (1/1)

In the title co-crystal, C22H14O4·CH4N2O, the 1,1′-binaphthyl-2,2′-dicarboxylic acid (BNDA) and urea molecules are connected via a system of hydrogen bonds into a chiral two-dimensional polymeric structure parallel to the (001) plane. As the crystal is centrosymmetric, it consists of alternately stacked BNDA–urea layers of opposite chirality. The urea H atoms trans to the C=O group are bonded in a chelating mode [R 1 2(6)] to the carbonyl O atom from one of the carboxylic acid groups which, in turn, acts as the donor of an O—H⋯O hydrogen bond to another urea molecule. The [010] chains thus formed are further connected via an R 2 2(8) hydrogen-bond motif formed between urea and the second carboxylic acid group of BNDA.

1-(5-Acetyl-2-hy­droxy­phen­yl)ethanone

The crystal structure of the title compound, C10H10O3, is characterized by classical intramolecular hydrogen bonding. The hydroxy group is disordered over two positions (77 and 23%). The crystal structure is stabilized via π–π [3.5986 (1) Å] and weak nonclassical C—H⋯O interactions [3.2797 (15) Å].

S,S′-(Pyridazine-3,6-di­yl)dithio­uronium dichloride methanol monosolvate

In the title compound, C6H10N6S2 2+·2Cl−·CH3OH, the pyridazine ring is almost planar, the greatest deviation from the mean plane being 0.025 (2) Å for one of the ring N atoms. The two thiouronium substituents are tilted out of this plane by 60.87 (6) and 57.94 (7)°. The thiouronium cations and the chloride anions are linked by strong N—H⋯Cl hydrogen bonds. The methanol solvent molecule interacts with both the chloride ion (through an O—H⋯Cl hydrogen bond) and the cation (through an N—H⋯O hydrogen bond), resulting in a three-dimensional supramolecular arrangement.

9,9'-(Biphenyl-2,2'-di-yl)difluoren-9-ol 4-methyl-pyridine solvate.

The title compound, C38H26O2·C6H7N, crystallized as a host–guest complex from a solvent mixture of 4-methylpyridine and acetone. The dihedral angle between the rings in the biphenyl unit is 87.06 (3)°. The methylpyridine guest molecules are linked to the host molecules via O—H⋯ N hydrogen bonds, forming discrete pairs. The other OH group of the host forms an intramolecular O—H⋯O hydrogen bond.

Redetermnation of lagochiline monohydrate

In the title compound, C20H36O5·H2O, previously studied by film methods [Vorontsova et al. (1975 ▶). Izvest. USSR Ser. Chem. 2, 338–343], the H atoms have been located and the absolute structure (seven stereogenic centres) established. An intramolecular O—H⋯O hydrogen bond generates an S(6) ring. In the crystal, molecules are linked by O—H⋯O hydrogen bonds, forming a three-dimensional network.

Supramolecular associations in bisimidazole derivative/formic acid solvates

Recently, heterocyclic imidazole derivatives (especially phenylimidazoles) have attracted considerable attention because of their unique optical properties [1]. From solution of formic acid have been obtained two types solvates of 1,4bis(4’,5’-diphenylimidozol-2-yl)benzene with formic acid – unstable and stable forms. The first unstable form – yellow plate, Sp.gr.P-1, cell parameters: a=10.420(2)Å b=13.804(3)Å, c=15.251(3)Å, α=63.86(3), β=82.23(3) γ=70.58(3), V=1857.1(7)Å , the host/guest ratio is 1:5. Five formic acid molecules form the glue between two molecules of bisimidazole derivative through hydrogen bonding, thus forming 0D supramolecular arrangement. The second stable form –yellow bulk needles, crystallized in C2/c space group and have following cell parameters: a=35.395(7)Å, b=5.1576(10)Å, c=20.607(4)Å, β=120.85(3), V=3229.7(11)Å. Host/guest ratio is 1:2:2H2O. In this structure host and guest molecules via H-bonds are associated in 1D chain in the c-axis direction. A proton from the formic acid was transferred to one of the imidazole rings. Therefore one nitrogen of the imidazole ring is positively charged.