In the mol-ecule of the title compound, C(22)H(26)N(4)O(4)S(2), the central O-CH(2)-CH(2)-O chain adopts a synclinal conformation [torsion angle = 65.0 (2)°]. The crystal structure is stabilized by intra-molecular N-H⋯O=C and inter-molecular N-H⋯O-C hydrogen bonds.

There are two mol-ecules in the asymmetric unit of the title compound, C(8)H(7)BrO(2). In the crystal, they form independent chains propagating in [010] linked by O-H⋯O hydrogen bonds.

In the title compound, [Mg(H(2)O)(6)](C(7)H(4)NO(4))(2), a single six-coordinate Mg(2+) cation (site symmetry 2/m) is bonded to six water mol-ecules in a distorted octa-hedral geometry. The crystal packing between the complex cation and the zwitterionic organic cation (m symmetry) is stabilized by inter-molecular O-H⋯O hydrogen bonds and weak inter-molecular C-H⋯O inter-actions.

The full mol-ecule of the title compound, C(18)H(18)N(2)O(4), is generated by the application of an inversion centre. There are strong π-π inter-actions between adjacent mol-ecules with a centroid-centroid distance of 3.298 (2)Å.

In the mol-ecule of the title compound, C(20)H(16)N(2)O(2), two intra-molecular N-H⋯O inter-actions occur. The mol-ecular chains are linked by N-H⋯π and C-H⋯π inter-actions into a three-dimensional network, which seems to be very effective in the stabilization of the crystal structure.

The mol-ecular skeleton of the title mol-ecule, C(8)H(6)N(4), is essentially planar [maximum deviation from the mean plane of 0.037 (2) Å]. All N atoms are involved in the formation of inter-molecular N-H⋯N hydrogen bonds. The crystal packing exhibits also dipole-dipole inter-actions between the cyano groups of neighbouring mol-ecules [C⋯C 3.473 (2) Å].

In the title compound, C(21)H(21)N(5)O(2)·H(2)O, the seven-membered ring adopts a boat-shaped conformation with the methine C atom as the prow. In the crystal, the water mol-ecule links adjacent mol-ecules by O-H⋯O and O-H⋯N hydrogen bonds into a zigzag chain running along the c axis of the monoclinic cell.

The Ce(III) atom in the title compound, {[Ce(C(8)H(2)NO(6))(H(2)O)(5)]·4H(2)O}(n), is N,O,O'-chelated by the carboxyl-ate trianion and is coordinated by five water mol-ecules; a carboxyl O atom from an adjacent trianion bridges the Ce(III) atom, resulting in a chain running along the a axis. The nine atoms surrounding the metal atom comprise a tricapped trigonal-prismatic polyhedron. The coordi...

The title compound, C(11)H(11)N(3), crystallizes with two mol-ecules (A and B) in the asymmetric unit. The geometries of both mol-ecules are very similar, with the exception of the torsion angles of the inter-ring chains; the values for C-N-C-C are 67.4 (5) and -69.3 (5)° for mol-ecules A and B, respectively. The dihedral angles between the pyridyl ring planes are 84.0 (2) and 83.2 (2)° for mol...

In the crystal structure of the title compound, C(12)H(6)Br(2)S(3), the mol-ecules are planar (r.m.s. deviation = 0.06 Å). Consecutive mol-ecules do not stack in a planar fashion. There is an angle of 81.7 (12)° between the planes of the closest mol-ecules.