3,3,6,6-Tetra-methyl-9-(2-nitro-phen-yl)-3,4,6,7-tetra-hydro-2H-xanthene-1,8(5H,9H)-dione.

In the title compound, C(23)H(25)NO(5), the pyran ring adopts a flattened boat conformation, while the two cyclo-hexenone rings are in envelope conformations. The 3-nitro-phenyl ring is almost perpendicular to the pyran ring, making a dihedral angle of 87.1 (3)°.

4-Benzyl-4-methyl-morpholinium hexa-fluoro-phosphate.

In the title compound, C(12)H(18)NO(+)·PF(6) (-), the asymmetric unit consists of two cation-anion pairs. The six F atoms of one anion are disordered over two sets of sites in a 0.592 (6):0.

9,9-Dimethyl-12-phenyl-8,9-dihydro-12H-benzo[a]xanthen-11(10H)-one.

The title compound, C(25)H(22)O(2), was synthesized via the three-component coupling of benzaldehyde, 2-naphthol and 5,5-dimethyl-cyclo-hexane-1,3-dione. In the crystal structure, centrosymmetrically related mol-ecules are linked into dimers by pairs of inter-molecular C-H⋯O hydrogen bonds. The dimers are further connected into a three-dimensional network by π-π aromatic stacking inter-actions involving the naphthalene ring system, with centroid-centroid separations of 3.

Hexaaquanickel(II) bis[2-carboxylato-2-(isothiouronium-S-ylmethyl)propane-1,3-diyl phosphate] hexahydrate.

In the title complex, [Ni(H(2)O)(6)](C(6)H(10)N(2)O(6)PS)(2) x 6 H(2)O, the asymmetric unit consists of one-half of an Ni atom (which lies on an inversion centre) with three coordinated water molecules, one complete 2-carboxylato-2-(isothiouronium-S-ylmethyl)propane-1,3-diyl phosphate anion and three noncoordinated water molecules. The hexaaquanickel(II) cations have distorted octahedral coordination and are connected via water chains to form two-dimensional supramolecular networks parallel to the ab plane. The phosphate ester anion is linked via N-H.

Poly[[diaquabis(mu2-1-oxo-2,6,7-trioxa-1-phosphabicyclo[2.2.2]octane-4-carboxylato)copper(II)] dihydrate].

The asymmetric unit of the title complex, {[Cu(C(5)H(6)O(6)P)(2)(H(2)O)(2)] x 2 H(2)O}(n), consists of half a Cu atom, one complete 1-oxo-2,6,7-trioxa-1-phosphabicyclo[2.2.2]octane-4-carboxylate anion ligand and two non-equivalent water molecules.

Bis(acetophenone oxime) O,O'-methyl-ene ether.

In the mol-ecule of the title compound, C(17)H(18)N(2)O(2), the dihedral angle between the aromatic rings is 74.26 (3)°. The oxime units are oriented at dihedral angles of 7.

4-Hydroxy-ethyl-4-methyl-morpholinium chloride.

In the title compound, C(7)H(16)NO(2) (+)·Cl(-), the asymmetric unit consists of two cation-anion pairs, in which the ion pairs are inter-connected by weak C-H⋯Cl hydrogen bonds. Each cation forms a network of weak C-H⋯Cl hydrogen bonds to surrounding chloride ions. The morpholine ring is in a chair conformation.

4-Allyl-4-ethyl-morpholinium chloride.

In the title molecular salt, C(9)H(18)NO(+)·Cl(-), the morpholine ring adopts a chair conformation. In the crystal structure, intra-molecular C-H⋯Cl bonds occur and inter-molecular C-H⋯O and C-H⋯Cl hydrogen bonds link the mol-ecules.