This paper reports the preparation, characterization and the crystal X-ray structures of metal-containing ionic liquid complexes based on chiral pyridinium cations and tetrachloropalladate (II) [PdCl4]2-.

The title salt, C(5)H(6)N(+)·C(7)H(4)F(3)O(3)S(-), is an ion pair in which the pyridium cation is linked to the 4-(trifluoro-meth-yl)benzene-sulfonate anion by an N-H⋯O hydrogen bond. The F atoms of the trifluoro-methyl group are disordered over two sites in a 0.584 (9):0.416 (9) ratio.

In the title compound, C(8)H(10)NO(2) (+)·NO(3) (-), the cation is essentially planar with C-O-C-C and C-O-C-O torsion angles of -178.1 (2) and 2.1 (4)°, respectively. In the crystal, N-H⋯O and C-H⋯O hydrogen-bond inter-actions stabilize the structure.

In the title compound, C(11)H(11)N(2)O(2)S(+)·NO(3) (-), the dihedral angle between the benzene and pyridinium rings is 87.59 (8)°. An intra-molecular C-H⋯O inter-action occurs in the cation. In the crystal structure, ion pairs occur, being linked by two strong N-H⋯O inter-actions, forming R(2) (2)(8) loops. The packing is further stabilized by weak C-H⋯O inter-actions.

In the title compound, C(6)H(8)NO(2) (+)·Cl(-), inter-molecular O-H⋯Cl and N-H⋯Cl hydrogen bonds are observed in which each chloride anion links three adjacent cations into a hydrogen-bond network.

In the title compound, C(11)H(11)N(2)O(2)S(+)·ClO(4) (-), the dihedral angle between the benzene and pyridinium rings is 87.33 (10)°. An intra-molecular N-H⋯O inter-action, with an S=O-bonded O atom as receptor, occurs in the cation. In the crystal structure, ion pairs occur, being linked by strong N-H⋯O hydrogen bonds. The perchlorate anion plays a further role in the mol-ecular packing by acc...

The title compound, C(13)H(13)N(2)O(+)·Cl(-), (1), was obtained as a colorless crystalline by-product during the synthesis of N-(2-pyridylmeth-yl)benzoyl-amine (2). The C-O bond length of 1.231 (2) Å in the benzoyl unit of (1) is slightly elongated in comparison with isolated C=O double bonds as also observed for (2) [1.237 (2) Å]. The N-C bond length of 1.345 (2) Å in the benzoic acid amide un...

3-Hydroxypyridinium and 3-(hydroxymethyl)pyridinium O-terpenyl aryldithiophosphonates were obtained by the reactions of 3-hydroxypyridine 3-(hydroxymethyl)pyridine with aryldithiophosphonic acids on basis (1R,2S,5R)-(−)-menthol, (1S)-endo-(–)-borneol, racemic isoborneol, carvacrol. The salts possess high antimicrobial activity against Bacillus cereus Candida albicans.

A DFT/TDDFT investigation was carried out on a series of homoleptic triphenylamine-featured Ir(iii) complexes [: (fac-tris[2-phenyl-4-(2-(N,N-diphenylamino)phenyl)pyridine]iridium(iii)); : (fac-tris[2-phenyl-4-(3-(N,N-diphenylamino)phenyl)pyridine]iridium(iii)); : (fac-tris[2-phenyl-4-(4-(N,N-diphenylamino)phenyl)pyridine]iridium(iii))] with one triphenylamine unit in the 2-phenylpyridine (ppy)...

PURPOSE The antipsychotic drug haloperidol can be metabolised to pyridinium metabolites haloperidol pyridinium (HP+) and reduced haloperidol pyridinium (RHP+). These pyridinium metabolites were proposed to contribute to the extrapyramidal side effects of haloperidol, because they are structural analogues of N-methyl-4-phenylpyridinium (MPP+), a well-known neurotoxin. RHP+ can be oxidized to HP+...