2-Cyano­quinolin-1-ium hydrogen sulfate

The title salt, C10H7N2 +·HSO4 −, is formed by the transfer of a proton from H2SO4 to the N atom of 2-cyano­quinoline during crystallization. The quinoline ring system is approximately planar with a maximum deviation of 0.013 (3) Å. In the crystal, the cations are linked to the anions via inter­molecular N—H⋯O, O—H⋯O and C—H⋯O hydrogen bonds, forming a layered network

8-Hy­droxy­quinolin-1-ium nitrate

In the title salt, C9H8NO+·NO3 −, the quinoline ring system is essentially planar with a maximum deviation of 0.043 (1) Å. In the crystal, an R 2 2(7) ring motif is formed by inter­molecular N—H⋯O and C—H⋯O hydrogen bonds between the cation and the anion. In addition, inter­molecular O—H⋯O and C—H⋯O hydrogen bonds link the two ions, generating an R 2 2(8) ring motif. These sets of ring motifs are further linked into a ribbon along the a axis via inter­molecular C—H⋯O hydrogen bonds

4-[(4-Fluoro­benzyl­idene)amino]-3-[1-(4-isobutyl­phen­yl)eth­yl]-1H-1,2,4-triazole-5(4H)-thione

In the title compound, C21H23FN4S, the benzene rings of the isobutyl­phenyl and fluoro­benzene units form dihedral angles of 75.89 (7) and 13.26 (7)°, respectively, with the triazole ring. An intra­molecular C—H⋯S hydrogen-bonding contact generates an S(6) ring motif. In the crystal packing, pairs of N—H⋯S hydrogen bonds link neighbouring mol­ecules into inversion dimers, forming R 2 2(8) ring motifs. The crystal structure is further stabilized by C—H⋯π inter­actions

Crystal structure of tetraaquabis(3,5-diamino- 4H-1,2,4-triazol-1-ium)cobalt(II) bis[bis(pyridine-2,6-dicarboxylato)- cobaltate(II)] dihydrate

The asymmetric unit of the title compound, [Co(C2H6N5)2- (H2O)4][Co(C7H3NO4)2]2�2H2O, features 1.5 CoII ions (one anionic complex and one half cationic complex) and one water molecule. In the cationic complex, the CoII atom is located on an inversion centre and is coordinated by two triazolium cations and four water molecules, adopting an octahedral geometry where the N atoms of the two triazolium cations occupy the axial positions and the O atoms of the four water molecules the equatorial positions. The two triazole ligands are parallel offset (with a distance of 1.38 A ° between their planes). In the anionic complex, the CoII ion is six-coordinated by two N and four O atoms of the two pyridine-2,6- dicarboxylate anions, exhibiting a slightly distorted octahedral coordination geometry in which the mean plane of the two pyridine-2,6-dicarboxylate anions are almost perpendicular to each other, making a dihedral angle of 85.87 (2)�. In the crystal, molecules are linked into a three-dimensional network via C—H� � �O, C—H� � �N, O—H� � �O and N—H� � �O hydrogen bonds

9-(4-Hy­droxy­phen­yl)-3,3,6,6-tetra­methyl-4,5,6,9-tetra­hydro-3H-xanthene-1,8(2H,7H)-dione

In the title compound, C23H26O4, the two cyclo­hexene rings adopt envelope conformations whereas the pyran ring adopts a boat conformation. In the crystal, pairs of inter­molecular O—H⋯O hydrogen bonds link the mol­ecules into inversion dimers

1-Isobutyl-4-meth­oxy-1H-imidazo[4,5-c]quinoline

In the title compound, C15H17N3O, the 1H-imidazo[4,5-c]quinoline ring system is approximately planar, with a maximum deviation of 0.036 (1) Å. The C—N—C—C torsion angles formed between this ring system and the isobutyl unit are −99.77 (16) and 79.71 (17)°. In the crystal, inter­molecular C—H⋯O hydrogen bonds link the mol­ecules into chains along the c axis

Quinoline-2-carbonitrile

In the title compound, C10H6N2, the mol­ecule is almost planar, with an r.m.s. deviation of 0.014 Å. The dihedral angle between the aromatic rings is 1.28 (16)°. In the crystal, mol­ecules are stacked along the a axis by way of weak aromatic π–π stacking inter­actions between the benzene and pyridine rings of adjacent mol­ecules [centroid–centroid separation = 3.7943 (19) Å]

6-Chloro-3-[5-(4-fluoro­phen­yl)-1-phenyl-4,5-dihydro-1H-pyrazol-3-yl]-2-methyl-4-phenyl­quinoline

In the title compound, C31H23ClFN3, the pyrazole ring forms dihedral angles of 72.75 (7), 18.08 (9) and 86.26 (9)° with the quinoline ring system, the phenyl ring and the fluoro­phenyl ring, respectively. In the crystal, inter­molecular C—H⋯N hydrogen bonds link the mol­ecules into chains propagating along the c axis. The crystal structure is further stabilized by C—H⋯π inter­actions

(E)-3-[4-(Dimethyl­amino)­phen­yl]-1-(2-methyl-4-phenyl­quinolin-3-yl)prop-2-en-1-one 0.7-hydrate

In the title compound, C27H24N2O·0.7H2O, the quinoline ring system is approximately planar, with a maximum deviation of 0.011 (1) Å, and forms dihedral angles of 74.70 (4) and 80.14 (4)° with the phenyl and benzene rings, respectively. In the crystal, the mol­ecules are linked to the water mol­ecules via inter­molecular O—H⋯N hydrogen bonds and further stabilized by C—H⋯π inter­actions involving the centroid of the benzene ring of the quinoline group. This benzene ring is observed to form a π–π inter­action with an adjacent pyridine ring [centroid–centroid distance = 3.7120 (6) Å]

4-Hydrazinyl-1-isobutyl-1H-imidazo[4,5-c]quinoline

In the title compound, C14H17N5, the 1H-imidazo[4,5-c]quinoline ring system is essentially planar, with a maximum deviation of 0.0325 (7) Å. In the crystal, a pair of inter­molecular N—H⋯N hydrogen bonds link neighbouring mol­ecules, forming an inversion dimer and generate an R 2 2(10) ring motif. These dimers are further connected into a chain along the b axis via inter­molecular C—H⋯N hydrogen bonds, resulting in an R 2 2(14) ring motif