metal-organic compounds
The title compound, [CuBr(C7H9N)2], consists of monomeric molecules in which the Cu atom displays trigonal planar coordination, with Cu—N = 1.9970 (15) and 1.9946 (14) Å, and Cu—Br = 2.3422 (3) Å. The packing involves layer formation parallel to (10) by C—HBr interactions.
organic compounds
In the title compound, C19H30Si, the double bonds are essentially localized. The central ring and its substituents, including the triple-bond system, are coplanar, with the Si atom lying 0.148 (2) Å out of the plane. The packing involves herring-bone layers parallel to the ab plane.
organic compounds
In the title compound, C24H23ClO4, the side chain displays an extended conformation. The main secondary interactions involve a bifurcated hydrogen-bond system (C—H)2O to the carbonyl O atom. Each ring is involved in a long C—Hπ interaction.
organic compounds
In the title compound, C30H18, the fluorene moiety displays normal dimensions, such as a narrow ring angle of 105.3 (3)° at the 9-position, the atom bearing the exocyclic double bond. The phenyl rings subtend angles of 14.8 (2) and 3.9 (2)° to the fluorene plane. Molecules are stacked parallel to the short c axis of 4.001 (1) Å.
organic compounds
The title compound, C7H7I2NO2+·I−·C7H6I2NO2, crystallizes with Z′ = ; the iodide anion lies on a twofold axis, and in the cation/zwitterion adduct the acidic H atom is disordered over an inversion centre. The residues are linked to form zigzag chains in the overall direction [103] by II interactions between anion and cation, and by classical O—HO hydrogen bonds. Weak hydrogen bonds C—HO link the chains to form layers parallel to (30).
organic compounds
In the title compound, 2C30H18·3C12H4N4, the asymmetric unit consists of half a formula unit (one quinodimethane molecule displays inversion symmetry). There is no ring stacking; instead, the residues associate by weak C—HN contacts in planes parallel to (2).
organic compounds
The molecule of the title compound, C12H10Br2, displays crystallographic inversion symmetry and is essentially planar. Bond lengths show the typical naphthalene pattern. The crystal packing shows no short HBr, BrBr or C—Hπ contacts.
organic compounds
The title compound, C22H22, displays no crystallographic symmetry. The central benzene ring subtends interplanar angles of 63.00 (6) and 66.09 (6)° (in opposite senses) to the outer rings. The crystal packing involves two short C—Hπ contacts.
organic compounds
In the title compound, C22H34Si2, the two independent molecules are closely similar. The reduced rings show a flattened twist conformation. Several features of [2.2]paracyclophane strain (e.g. lengthened bridge bonds) are apparent; an exception is furnished by the normal sp2 values of the angles at the bridgehead atoms of the reduced rings.
organic compounds
The title compound, C28H52Si4, crystallizes in the uncommon space group I4122 with 222 symmetry. Despite the reduction of the rings, several features of [2.2]paracyclophane strain are still apparent.
organic compounds
The title compound, C8H8Br4, displays crystallographic inversion symmetry. The packing involves interpenetrating corrugated layers built up via BrBr and Brπ contacts.
organic compounds
The title compound, C11H20O, shows a wide Me3C—C=C angle of 129.60 (14)°. Molecules associate into zigzag chains parallel to [101] via a hydrogen bond HmethylOketone.
organic compounds
The molecule of the title compound, C20H16Br2, displays crystallographic inversion symmetry. Two C—HBr interactions link the molecules into layers parallel to (11). The shortest BrBr contact is 4.1599 (4) Å.
organic compounds
In the title compound, C14H18O4, the central six-membered ring subtends interplanar angles of 3.5 (1), 78.4 (1) and 78.73 (4)°, respectively, with the five-membered ring, the cyclopropane ring and the ester side chain. The C-C bond distal to the carbonyl substituent is shortened compared to the other two bonds of the cyclopropane moiety. The carboxylic acid groups form inversion-symmetric dimers by hydrogen bonding.
organic compounds
In the unit cell of the title compound, 11,13,41,43-tetrahydro-1,4(4,7)-di(benzo[c]thiophena)cyclohexaphane, C20H20S2, there are four independent but closely similar molecules, each with crystallographic inversion symmetry. The packing is interpreted in terms of layers formed via C—Hπ interactions.