Ethyl 5-acetyl-2-amino-4-methyl­thio­phene-3-carboxyl­ate

In the title compound, C10H13NO3S, prepared in a one-pot reaction, the mol­ecular conformation is stabilized by an intra­molecular N—H⋯O hydrogen bond. The packing is consolidated by further N—H⋯O links. The H atoms of two of the methyl groups are disordered over two sets of sites with equal occupancies

Rubidium(I) monensinate dihydrate

In the title complex, [Rb(C36H61O11)]·2H2O, the Rb+ cation is coordinated by seven O atoms of monensin. Rb—O distances range from 2.7870 (17) to 3.1429 (17) Å. Both O atoms of the carboxyl­ate group are involved in the coordination of Rb. The structure displays inter- and intra­molecular O—H⋯O and C—H⋯O hydrogen-bonding inter­actions

2,9-Dimethyl-4,7-diphenyl-1,10-phenanthrolin-1-ium tetra­chloridoaurate(III)

Both the cation and anion of the title compound, (C26H21N2)[AuCl4], are disposed about a plane of mirror symmetry. The 2,9-dimethyl-4,7-diphenyl-1,10-phenanthrolinium ring is oriented at a dihedral angle of 44.2 (1)° with respect to the planar phenyl ring systems. The AuIII atom has a square-planar environment defined by four Cl atoms. The crystal structure is stabilized by C—H⋯π and Au⋯π ring–metal (3.551 Å) inter­actions. In the crystal structure, the mol­ecules stack along the c axis via N—H⋯N hydrogen-bond inter­actions

1-Amino-5-(4-methyl­benzo­yl)-4-(4-methyl­phen­yl)pyrimidin-2(1H)-one

In the title compound, C19H17N3O2, the dihedral angles between the pyrimidine ring and the two benzene rings are 34.87 (12) (for the directly-bonded ring) and 69.57 (12)°. An intra­molecular N—H⋯O hydrogen bond occurs. The crystal packing features inter­molecular N–H⋯O hydrogen bonds

4-[(2-Hydr­oxy-1-naphth­yl)methyl­idene­amino]benzoic acid

The mol­ecule of the title compound, C18H13NO3, is almost planar, the dihedral angle between the naphthalene and benzene ring systems being 4.04 (6)°. The mol­ecular conformation and packing are stabilized by intra­molecular O—H⋯N and inter­molecular O—H⋯O and C—H⋯O inter­actions

(E)-1,1′-Bis[(E)-but-2-en­yl]-3,3′-(propane-1,3-di­yl)bis­(1H-benzimidazol-3-ium) dibromide monohydrate

The title compound, C25H30N4 2+·2Br−·H2O, was synthesized from 1,1′-propyl­enedibenzimidazole and (E)-1-bromo­but-2-ene in dimethyl­formamide solution. The two benzimidazole ring systems are essentially planar, with maximum deviations of 0.011 (4) and 0.023 (3) Å. The dihedral angle between these two ring systems is 25.87 (15)°. The crystal structure is stabilized by inter­molecular O—H⋯Br and C—H⋯Br hydrogen-bonding inter­actions. Atmospheric water was incorporated into the crystal structure

trans-rac-[1-Oxo-2-phenethyl-3-(2-thien­yl)-1,2,3,4-tetra­hydro­isoquinolin-4-yl]methyl 4-methyl­benzene­sulfonate

The title compound, C29H27NO4S2, was synthesized by reaction of trans-rac-4-(hydroxy­meth­yl)-2-phenethyl-3-(thio­phen-2-yl)-3,4-dihydro­isoquinolin-1(2H)-one and 4-methyl­benzene-1-sulfonyl chloride in the presence of Et3N in CH2Cl2. The relative orientations of the benzene ring (A) of the 3,4-dihydro­isoquinolinone ring system, the thio­phene ring (B), the benzene ring (C) of the methyl­benzene group and the phenyl ring (D) result in the following dihedral angles: A/B = 80.91 (16), A/C = 22.79 (18), A/D = 9.9 (2), B/C = 80.73 (19), B/D = 88.9 (2) and C/D = 29.9 (2)°. The crystal structure is stabilized by weak inter­molecular C—H⋯O hydrogen bonds and C—H⋯π inter­actions

Methyl trans-rac-2-hexyl-1-oxo-3-(2-pyrid­yl)-1,2,3,4-tetra­hydroisoquinoline-4-carboxyl­ate

The title compound, C22H26N2O3, was synthesized by esterification of trans-rac-2-hexyl-1-oxo-3-(2-pyrid­yl)-1,2,3,4-tetra­hydro­isoquinoline-4-carboxylic acid in the presence of H2SO4 in methanol. The dihedral angle between the benzene and pyridine rings is 84.46 (17)°. The piperidine ring adopts a screw-boat conformation. In the crystal, inversion dimers linked by two C—H⋯O bonds occur

2-[3-(2-Pyrid­yl)pyrazin-2-yl]pyridinium tetra­chloridoaurate(III)

In the anion of the title compound, (C14H11N4)[AuCl4], the AuIII atom has an almost perfect square-planar coordination. In the crystal structure, an intra­molecular N—H⋯N and intermolecular C—H⋯Cl hydrogen bonds are observed. In addition, there is also a ring–metal inter­action between the pyrazine ring and the AuIII atom; the distance between the centroid of the pyrazine ring and the AuIII atom is 3.628 (2) Å

2-[(E)-4-Quinolylmethyl­ideneamino]­phenol

In the title compound, C16H12N2O, the dihedral angle between the two aromatic ring systems is 68.54 (5)°. The mol­ecular packing is stabilized by intra- and inter­molecular O—H⋯N and intra­molecular C—H⋯N hydrogen-bond inter­actions