Wen-Yuan Wu

Dimethyl 2,2-bis­(2-cyano­ethyl)malonate

The asymmetric unit of the title compound, C11H14N2O4, contains one half-molecule; a twofold rotation axis passes through the central C atom. Intermolecular C—H⋯N hydrogen bonds link the molecules into a one-dimensional supramolecular structure.

4,4-Diacetyl-hepta-nedinitrile.

The asymmetric unit of the title compound, C11H14N2O2, contains one half-molecule as the central C atom of the molecule lies on a twofold rotation axis. In the crystal structure, weak intermolecular C—H⋯N hydrogen bonds link the molecules into zigzag chains along c.

Dibromidobis(pyrazine-2-carboxylic acid-κN4)mercury(II) dihydrate

The asymmetric unit of the title compound, [HgBr2(C5H4N2O2)2]·2H2O, contains one half-molecule and one water molecule. The HgII ion, lying on a twofold rotation axis, is four-coordinated by two N atoms of pyrazine-2-carboxylic acid ligands and two bromide ions, forming a highly distorted tetrahedral geometry. In the crystal structure, intermolecular O—H⋯O and O—H⋯N hydrogen bonds link the molecules.

2-Bromo-5-iodo-1,3-dimethyl-benzene.

In the molecule of the title compound, C8H6BrI, the H atoms of methyl groups are disordered; site-occupation factors were fixed at 0.50. The non-H atoms all lie on a crystallographic mirror plane. Weak intramolecular C—H⋯Br hydrogen bonds result in the formation of two non-planar five-membered rings.

5-Methyl­isoxazole-4-carboxylic acid

In the title compound, C5H5NO3, the molecule lies on a crystallographic mirror plane with one half-molecule in the asymmetric unit. An intramolecular C—H⋯O interaction is present. In the crystal, strong intermolecular O—H⋯N hydrogen bonds result in the formation of a linear chain structure along [100], and there are also weak C—H⋯O hydrogen bonds between the chains which help to stabilize the crystal packing.

1,4-Bis(benz-yloxy)-2-tert-butyl-benzene.

The title compound, C24H26O2, was obtained unintentionally as the product of an attempted synthesis of a new chiral cobalt salen catalyst. There are no classical hydrogen bonds; intermolecular C—H⋯π stacking interactions between aromatic rings help to establish the molecular conformation.

Poly[diaqua-μ4-oxalato-di-μ6-phosphato-tetra­cobalt(II)]

In the structure of the title compound, [Co4(C2O4)(PO4)2(H2O)2]n, there are layers composed of the phosphate anions and two independent CoII cations. These layers are parallel to (001) and are bridged by the oxalate anions that are situated in special positions on centres of symmetry. One independent Co atom has an octahedral coordination, while the second independent Co atom is coordinated in a trigonal–bipyramidal coordination that includes the water molecule. The crystal packing is stabilized by O—H⋯O hydrogen bonds between the coordinated water molecules and oxalate O atoms.

N-Acryloyl-L-alanine

The title compound, (I), is an important intermediate and also a free radical addition monomer for the syntheses of radiation-sensitive (Heilmann & Palensky, 1981), hydropholic (Heilmann & Rasmussen, 1984) and pressure-sensitive (Heilmann, 1979) polymers. The crystal structure determination of (I) has been carried out in order to elucidate the molecular conformation. We report here the synthesis and the crystal structure of (I).