Melitracenium chloride

In the title compound [systematic name: 3-(10,10-dimethyl­anthracen-9-yl­idene)-N,N,N-trimethyl­propanaminium chlor­ide], C21H26N+·Cl−, the cyclo­hexane ring adopts a chair conformation. The dihedral angle between the terminal benzene rings is 40.43 (12)°. In the crystal, ions are linked through inter­molecular N—H⋯Cl and C—H⋯Cl hydrogen bonds, forming supra­molecular layers parallel to the bc plane

Naphthalen-1-aminium chloride

In the crystal structure of the title compound, C10H10N+·Cl−, the two components are connected via N—H⋯Cl hydrogen bonds, forming a layer parallel to the bc plane

Ethyl 4-(phenyl­sulfon­yl)piperazine-1-carboxyl­ate

In the title compound, C13H18N2O4S, the piperazine ring adopts a chair conformation. The dihedral angle between the least-squares planes through the piperazine and benzene rings is 73.23 (10)°. In the crystal, there are no classical hydrogen bonds but stabilization is provided by weak C—H⋯π inter­actions

Orphenadrinium picrate picric acid

The asymmetric unit of the title compound N,N-dimethyl-2-[(2-methyl­phen­yl)phenyl­meth­oxy]ethanaminium picrate picric acid, C18H24NO+·C6H2N3O7 −·C6H3N3O7, contains one orphenadrinium cation, one picrate anion and one picric acid mol­ecule. In the orphenadrine cation, the two aromatic rings form a dihedral angle of 70.30 (7)°. There is an intra­molecular O—H⋯O hydrogen bond in the picric acid mol­ecule, which generates an S(6) ring motif. In the crystal structure, the orphenadrine cations, picrate anions and picric acid mol­ecules are connected by strong inter­molecular N—H⋯O hydrogen bonds, π⋯π inter­actions between the benzene rings of cations and anions [centroid–centroid distance = 3.5603 (9) Å] and weak C—H⋯O hydrogen bonds, forming a three-dimensional network

Tramadol hydro­chloride–benzoic acid (1/1)

In the cation of the title co-crystal salt {systematic name: [2-hydroxy-2-(3-meth­oxy­phen­yl)cyclo­hexyl­meth­yl]dimethyl­aza­nium chloride–benzoic acid (1/1)}, C16H31NO2 +·Cl−·C7H6O2, the N atom is protonated and the six-membered cyclo­hexane ring adopts a slightly distorted chair conformation. The dihedral angle between the mean planes of the benzene rings in the cation and the benzoic acid mol­ecule is 75.5 (9)°. The crystal packing is stabilized by weak inter­molecular O—H⋯Cl, N—H⋯Cl and C—H⋯π inter­actions, forming a two-dimensional chain network along the b axis. The benzoic acid mol­ecule is not involved in the usual head-to-tail dimer bonding, but instead is linked to the ammonium cation through mutual hydrogen-bonding inter­actions with the chloride anion

1,3-Bis(2-cyano­benz­yl)imidazolium bromide

In the title salt, C19H15N4 +·Br−, the central imidazole ring makes dihedral angles of 83.1 (2) and 87.6 (2)° with the terminal benzene rings. The dihedral angle between the terminal benzene rings is 6.77 (19)°; the cyanide substituents have an anti orientation. In the crystal, the cations and anions are linked via C—H⋯N and C—H⋯Br hydrogen bonds, forming sheets lying parallel to the ac plane

(2,6-Difluoro­phen­yl)(4-methyl­piperidin-1-yl)methanone

In the title compound, C13H15F2NO, the piperidine ring adopts a chair conformation. The dihedral angle between the least-squares plane of the piperidine ring and the benzene ring is 48.75 (7)°. In the crystal structure, the mol­ecules are connected via C—H⋯O hydrogen bonds, forming a zigzag chain along the b axis

Diaqua­bis­(hydrogen tartrato)copper(II) dihydrate

The title complex, [Cu(C4H5O6)2(H2O)2]·2H2O, contains a CuII ion lying on an inversion centre. The coordination geometry of the CuII ion is a distorted octa­hedron with four O atoms from two hydrogen tartrate ions occupying the equatorial positions and two O atoms from two coordinated water mol­ecules occupying the axial positions. In the crystal structure, inter­molecular O—H⋯O and C—H⋯O hydrogen bonds link the mol­ecules into a three-dimensional network

4-(4-Chloro­phen­yl)-4-hy­droxy­piperidinium 2-(2-phenyl­eth­yl)benzoate

In the title compound, C11H15ClNO+·C15H13O2 −, the piperidinium ring adopts a chair conformation. In the crystal, cations and anions are connected by inter­molecular O—H⋯O and N—H⋯O hydrogen bonds, forming two-dimensional networks parallel to the bc plane. Furthermore, the crystal structure is stabilized by weak C—H⋯π inter­actions

10,10-Dimethyl­anthrone

In the title compound, C16H14O, the asymmetric unit consists of three crystallographically independent mol­ecules. The anthracene units are essentially planar, with maximum deviations of 0.165 (1), 0.153 (1) and 0.045 (1) Å in the three mol­ecules. In the crystal structure, mol­ecules are linked via inter­molecular C—H⋯O hydrogen bonds. Further stabilization is provided by C—H⋯π inter­actions