The relative configuration of the title compound, C(11)H(18)O(3), was corroborated by single-crystal X-ray diffraction analysis. In the crystal, mol-ecules are linked via a O-H⋯O hydrogen bond and a chain of mol-ecules is formed along [010].

The title compound, C(16)H(18)N(2)O(2)S, was obtained as an unexpected product while attempting to form carbon-nitro-gen bonds by catalytic amidation. The mol-ecule displays an E conformation about the C=N double bond. The planes of the two aromatic rings in the mol-ecule form a dihedral angle of 47.06 (9)°.

The title compound, C(16)H(18)O(3)S, features a U-shape mol-ecular structure with a dihedral angle between the terminal benzene rings of 20.8 (1)°. An intra-molecular O-H⋯O hydrogen bond helps to stabilize the mol-ecular structure. Inter-molecular classical O-H⋯O and weak C-H⋯O hydrogen bonding is present in the crystal structure.

The complete mol-ecule of the title compound, C(10)H(18)N(4)O(2), is generated by a crystallographic inversion centre at the mid-point of the central C-C bond. The two oxime groups have an E configuration. In the crystal, mol-ecules are linked through inter-molecular O-H⋯N hydrogen bonds.

The asymmetric unit of the centrosymmetric title compound, C(18)H(16)N(2)O(2), contains one half-mol-ecule. The central benzene ring forms a dihedral angle of 66.8 (1)° with two outer aromatic rings. In the crystal structure, weak inter-molecular C-H⋯N hydrogen bonds link mol-ecules into sheets parallel to (104).

The title mol-ecule, C(14)H(18)Cl(2)N(2)O(2), lies on a crystallographic inversion center and the each 4-chloro-butanamide group adopts an anti-staggered conformation. In the crystal, adjacent mol-ecules are linked through N-H⋯O contacts, forming infinite ribbons extending parallel to the a axis.

In the title mol-ecule, C(18)H(12)O(4), the phenyl ring is twisted by 23.2 (1)° from the mean plane of the chromene system. In the crystal, weak inter-molecular C-H⋯O hydrogen bonds link mol-ecules into zigzag chains extending in the [010] direction. An intra-molecular O-H⋯O hydrogen bond is also present.

In the title mol-ecule, C(18)H(21)ClN(2)O(3)S, the pyrimidine ring exhibits a half-chair conformation. The ethyl group is disordered between two positions in a ratio 0.74:0.26. In the crystal structure, the mol-ecules are linked into chains along the a axis by N-H⋯O hydrogen bonds.

In the title complex, [U(C17H14BrN3O2S)O2(C2H5OH)], the U(VI) cation has a distorted penta-gonal-bipyramidal environment with the penta-gonal plane defined by two N and two O atoms of the tetra-dentate Schiff base ligand and the O atom of the ethanol mol-ecule. Two oxide O atoms occupy the axial positions. The azomethine C=N group and the Br atom are disordered over two positions in a 0.8356 (1...

objective(s):cefixime (cfx), is a semi-synthetic third-generation oral cephalosporin antibiotic that is prescribed for the treatment of susceptible infections. there are some procedures for the determination of cfx in pharmaceutical formulations and biological samples. herein a spectrofluorimetric method was proposed for cfx determination based on the fluorescence quenching of terbium-danofloxa...