Giovanna Brancatelli

3-[2-(1H-1,3-Benzodiazol-2-yl)eth­yl]-1,3-oxazolidin-2-one

In the title compound, C12H13N3O2, the dihedral angle between the oxazolone ring and the benzimidazole unit is 45.0 (5)°, exhibiting a staggered conformation at the Cα—Cβ bond. In the crystal, a strong N—H⋯N hydrogen bond links the molecules into a C(4) chain along the c axis while a C—H⋯O hydrogen-bonding interaction generates a C(5) chain along the a axis, i.e. perpendicular to the other chain.

Chlorido(η-cyclo-octa-1,5-diene)(N,N'-diethyl-thio-urea-κS)rhodium(I).

In the title rhodium(I) complex, [RhCl(C8H12)(C5H12N2S)], N,N′-diethylthiourea acts as a monodenate S-donor ligand. The rhodium(I) coordination sphere is completed by the Cl atom and the COD [= 1,5-cyclooctadiene] ligand interacting through the π-electrons of the double bonds. If the midpoints of these two bonds are taken into account, the Rh atom exhibits a distorted square-planar coordination. The syn conformation of the N,N′-diethylthiourea ligand with respect to the Cl atom is stabilized by an intramolecular N—H⋯Cl hydrogen bond. A weak intermolecular N—H⋯Cl interaction links molecules along the a axis.

2,5-dicarboxyanilinium chloride monohydrate

The title compound, C8H8NO4+.Cl-.H2O, is the chlorohydrated form of 2-aminobenzene-1,4-dicarboxylic acid, the basic crystal structure of which is still not known. Molecules are linked by classical N-H...O, O-H...O, N-H...Cl and O-H...Cl hydrogen bonds, mainly along the molecular plane, into sheets built by unusual R6(4)(26), R6(4)(22) and R4(3)(22) rings. The stacking between layers is stabilized by another N-H...Cl hydrogen bond and by pi-pi interactions between aromatic rings facing each other.

(S)-2-[(2-Hy­droxy­benz­yl)aza­nium­yl]-4-(methyl­sulfan­yl)butano­ate

The zwitterionic title compound, C12H17NO3S, is a reduced Schiff base derived from (S)-N-(2-hydroxybenzylidene)methionine. An intramolecular interaction between the N—H and carboxylate groups forms a roughly planar (r.m.s. deviation = 0.1405 Å) five-membered ring containing the H(N), N, Cα, C(carboxylate) and O atoms in a pentagonal conformation. In the crystal, a supramolecular triangle-shaped motif is generated by molecules held together by O—H⋯O and N—H⋯O hydrogen bonds.