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1.  2,2′-{[2-(2-Hy­droxy­phen­yl)-4-methyl­imidazolidine-1,3-di­yl]bis­(methyl­ene)}diphenol 
The asymmetric unit in the title compound, C24H26N2O3, comprises two independent mol­ecules (A and B). In molecule A, the central 2-hydroxyphenyl ring is inclined to the mean plane of the major component of the imidazolidine ring by 84.52 (14)°, and by 68.08 (9) and 47.48 (9)° to the outer phenol rings. The later are inclined to one another by 66.76 (9)° and by 78.12 (14) and 80.20 (14)° to the imidazoline ring mean plane. In molecule B, the central 2-hydroxyphenyl ring is inclined to the mean plane of the imidazolidine ring by 73.64 (10)°, and by 75.60 (8) and 38.32 (9)° to the outer phenol rings. The later are inclined to one another by 69.47 (9)° and by 82.60 (10) and 64.26 (10)° to the imidazolidine ring mean plane. In each of the independent mol­ecules, two intra­molecular O—H⋯N hydrogen bond form S(6) ring motifs. In disordered mol­ecule A, the O—H groups of the 2-hy­droxy­benzyl groups are also involved in intra­molecular O—H⋯O hydrogen bonds, with the O atom of the hy­droxy­phenyl group acting as the acceptor. In the crystal, A molecules are linked by pairs of O—H⋯O hydrogen bonds forming inversion dimers. These dimers are linked to the B molecules via O—H⋯O hydrogen bonds forming double-layered slabs lying parallel to the bc plane.
PMCID: PMC3793786  PMID: 24109373
2.  Acetonyltriphenyl­phospho­nium nitrate 
Crystals of the title salt, C21H20OP+·NO3 −, are composed of acetonyltriphenyl­phospho­nium cations and nitrate anions that mainly inter­act through electrostatic forces. The P atom in the cation has a slightly distorted tetra­hedral environment, with C—P—C angles ranging from 104.79 (7) to 112.59 (6)°. The sum of O—N—O angles of the nitrate anion is 359.99°, reflecting its trigonal–planar character. C—H⋯O hydrogen bonds help to consolidate the crystal packing.
PMCID: PMC3569822  PMID: 23424568
3.  2,2′-[1,2-Phenyl­enebis(aza­nedi­yl)]di­aceto­nitrile 
The title compound, C10H10N4, shows chemical but not crystallographic C 2 symmetry. The two cyano­methyl groups are located in an anti position with respect to the aromatic ring. In the crystal, mol­ecules form parallel ladder-like tapes linked through two N—H⋯N hydrogen bonds. Further weak intra­molecular N—H⋯N hydrogen bonding is responsible for the elongation of one of the Caromatic—N bonds.
PMCID: PMC3589011  PMID: 23476247
4.  4,4′-Difluoro-2,2′-[imidazolidine-1,3-diylbis(methyl­ene)]diphenol 
In the title compound, C17H18F2N2O2, the imidazolidine ring system exists in a twist conformation. The mean plane through this ring system forms dihedral angles of 80.8 (8)° and 66.2 (13)°, with the benzene rings. The dihedral angle between the benzene rings is 52.0 (14)°. Two intra­molecular O—H⋯N hydrogen bonds each generate S(6) ring motifs. In the crystal, weak C—H⋯O hydrogen bonds form dimers, which are connected by further C—H⋯O inter­actions.
PMCID: PMC3470394  PMID: 23125807

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