Bis(2-{[2,8-bis-(trifluoro-meth-yl)quinolin-4-yl](hydr-oxy)meth-yl}piperidin-1-ium) tetra-chloridodiphenyl-stannate(IV)

Crystal structure of bis(di-n-butylammonium) tetrachloridodiphenylstannate(IV), C28H50Cl4N2Sn

C28H50Cl4N2Sn, monoclinic, P21/c (no. 14), a = 12.3981(2) Å, b = 13.2742(2) Å, c = 11.0847(2) Å, β = 111.657(2)°, V = 1695.49(5) Å3, Z = 2, R gt(F) = 0.0161, wR ref(F 2) = 0.0431, T = 100(2) K.

A kryptoracemic salt: 2-{[2,8-bis-(tri-fluoro-meth-yl)quinolin-4-yl](hy-droxy)meth-yl}piperidin-1-ium (+)-3,3,3-tri-fluoro-2-meth-oxy-2-phenyl-propanoate

The asymmetric unit of the title salt, C17H17F6N2O(+)·C10H8F3O3 (-), comprises two piperidin-1-ium cations and two carboxyl-ate anions. The cations, each having an l-shaped conformation owing to the near orthogonal relationship between the quinolinyl and piperidin-1-ium residues, are pseudo-enanti-omeric. The anions have the same absolute configuration but differ in the relative orientations of the carboxyl-ate, meth-oxy and benzene groups. Arguably, the most prominent difference between the anions occurs about the Cq-Om bond as seen in the Cc-Cq-Om-Cm torsion angles of -176.1 (3) and -67.1 (4)°, respectively (q = quaternary, m = meth-oxy and c = carboxyl-ate). The presence of Oh-H⋯Oc and Np-H⋯Oc hydrogen bonds leads to the formation of a supra-molecular chain along the a axis (h = hy-droxy and p = piperidin-1-ium); weak intra-molecular Np-H⋯Oh hydrogen bonds are also noted. Chains are connected into a three-dimensional architecture by C-H⋯F inter-actions. Based on a literature survey, related mol-ecules/cations adopt a uniform conformation in the solid state based on the letter L.

2-{[2,8-Bis(trifluoro-meth-yl)quinolin-4-yl](hy-droxy)meth-yl}piperidin-1-ium 3-amino-5-nitro-benzoate sesquihydrate

The asymmetric unit of the title salt solvate, C₁₇H₁₇F₆N₂O⁺·C₇H₅N₂O₄⁻·1.5H₂O, comprises a piperidin-1-ium cation, a 3-amino-5-nitro­benzoate anion, and three fractionally occupied [i.e. 0.414 (3), 0.627 (6) and 0.459 (5)] disordered water mol­ecules of solvation. The cation has an L shape with a C—C—C—C torsion angle of −102.9 (3)° for the atoms linking the quinolinyl group to the rest of the cation. In the anion, the carboxyl­ate and nitro groups are essentially coplanar with the benzene ring [O—C—C—C torsion angle = 179.7 (2)° and O—N—C—C torsion angle = −3.9 (3)°]. In the crystal, extensive O—H⋯O, O—H⋯F and N—H⋯·O hydrogen bonding leads to the formation of a layer in the ab plane.

tert-Butyl 2-{[2,8-bis-(trifluoro-meth-yl)quinolin-4-yl](hy-droxy)meth-yl}piperidine-1-carboxyl-ate

The title mol-ecule, C(22)H(24)F(6)N(2)O(3), adopts a folded conformation whereby the carboxyl-ate residue lies over the quinolinyl residue, with the dihedral angle between the carbamate and quinoline planes being 41.64 (7)°. Helical supra-molecular C(7) chains sustained by O-H⋯O hydrogen bonds propagating along the a-axis direction feature in the crystal packing. The F atoms of one of the CF(3) groups are disordered over two orientations; the major component has a site occupancy of 0.824 (7).

Benzyl 2-{[2,8-bis-(trifluoro-meth-yl)quinolin-4-yl](hy-droxy)meth-yl}piperidine-1-carboxyl-ate

The title mol­ecule, C₂₅H₂₂F₆N₂O₃, adopts an open conformation whereby the quinoline and carboxyl­ate ester groups are orientated in opposite directions but to the same side of the piperidine ring so that the mol­ecule has an approximate U-shape. The piperidine ring adopts a distorted boat conformation. In the crystal, inversion dimers linked by pairs of O—H⋯O hydrogen bonds generate R₂²(14) loops.

(R*,S*)-(±)-1-(2-{[2,8-Bis(trifluoromethyl)quinolin-4-yl](hydroxy)methyl}piperidin-1-yl)ethanone methanol monosolvate

The title mefloquine derivative has been crystallized as its 1:1 methanol solvate, C(19)H(18)F(6)N(2)O(2)·CH(3)OH. Each of the meth-ine-hydroxyl residue [the C-C-C-O torsion angle is -16.35 (17) °] and the piperidinyl group [distorted chair conformation] lies to one side of the quinolinyl ring system. The hydroxyl and carbonyl groups lie to either side of the mol-ecule, enabling their participation in inter-molecular inter-actions. Thus, the hydroxyl and carbonyl groups of two centrosymmetrically related mol-ecules are bridged by two methanol mol-ecules via O-H⋯O hydrogen bonds, leading to a four-mol-ecule aggregate. These are linked into a supra-molecular chain along the a axis via C-H⋯O inter-actions involving the hydroxyl-O atom. The chains assemble into layers that inter-digitate along the c axis being connected by C-H⋯F inter-actions.