Erratum: μ-Oxalato-bis-[bis-(triphenyl-phosphine)copper(I)] dichloro-methane disolvate. Corrigendum.

An erroneous claim in the paper by Royappa et al. [Acta Cryst. (2013), E69, m126] is corrected and a reference added for a previously published report of a closely related structure.[This corrects the article DOI: 10.1107/S1600536813002080.]

Crystal structure of N,N,N-tris-[(1,3-benzo-thia-zol-2-yl)meth-yl]amine.

The title compound, C24H18N4S3, exhibits three near planar benzo-thia-zole systems in a pseudo-C 3 conformation. The dihedral angles between the planes of the benzo-thia-zole groups range from 112.56 (4) to 124.68 (4)° In the crystal, mol-ecules are connected to each other through three short C-H⋯N contacts, forming an infinite chain along [100]. The molecules are also linked by π-π interactions with each of the three five-membered thiazole rings. [inter-centroid distance range: 3.614 (1)-4.074 (1) Å, inter-planar distance range: 3.4806 (17)-3.6902 (15) Å, slippage range: 0.759 (3)-1.887 (3) Å]

Dimethyl 2,2'-di-nitro-biphenyl-4,4'-di-carboxyl-ate.

The title compound, C16H12N2O8, exhibits two near-planar aromatic ester groups with ar-yl-ester dihedral angles of 2.1 (2) and 4.2 (3)°. The dihedral angle between the aromatic rings is 58.0 (1)°. The two nitro groups are tilted slightly from the plane of the aromatic rings, making dihedral angles of 14.1 (1) and 8.2 (2)°. In the crystal, mol-ecules are connected by weak C-H⋯O inter-actions, forming a three-dimensional network

Crystal structure of dimethyl 9H-carbazole-2,7-di-carb-oxy-late.

In the title compound, C16H13NO4, the carbazole ring system is almost planar with non-H atoms possessing a mean deviation from planarity of 0.037 Å. The two ester groups are orientated trans to one another and tilted slightly from the mean plane of the carbazole ring system, making dihedral angles of 8.12 (6) and 8.21 (5)°. In the crystal, mol-ecules are linked by pairs of N-H⋯O hydrogen bonds forming inversion dimers. The dimers are linked by parallel slipped π-π inter-actions, forming slabs propagating along the b-axis direction [inter-centroid distance = 3.6042 (8) Å, inter-planar distance = 3.3437 (5) Å, slippage = 1.345 Å]

2-Amino-4-methyl­pyridinium trifluoro­acetate: a monoclinic polymorph

The title salt, C6H9N2 +·C2F3O2 −, is a monoclinic polymorph of a previously reported structure [Hemamalini & Fun (2010). Acta Cryst. E66, o781–o782]. In the crystal structure, the cations and anions are linked by two different types of N—H⋯O hydrogen bonds, forming cation–anion pairs. These pairs are hydrogen bonded to neighbouring pairs via another N—H⋯O hydrogen bonds involving an H atom of the NH2 group and one of the O atoms of the COO− group into a chain extended along the b axis

N,N′-Di-tert-butyl-N′′-(2,6-difluoro­benzo­yl)phospho­ric triamide

In the title compound, C15H24F2N3O2P, the phosphoryl and carbonyl groups adopt anti positions relative to each other. The P atom is in a tetra­hedral coordination environment and the environment of each N atom is essentially planar. In the crystal, adjacent mol­ecules are linked via N—H⋯O=P and N—H⋯O=C hydrogen bonds into an extended chain parallel to the a axis. The crystal studied was a non-merohedral twin with a minor twin component of 36.4 (1)%

1,1′-(Ethane-1,2-di­yl)dipyridinium dichromate(VI)

In the cation of the title salt, (C12H14N2)[Cr2O7], the two pyridinium moieties are in an anti orientation with respect to one another. The dihedral angle between the pyridine rings is 6.3 (2)°. The N—C—C—N torsion angle is 177.5 (2)°. In the dianion, the CrVI ions are in a slightly distorted tetra­hedral coordination environment and the bond angles at the independent CrVI ions are in the ranges 105.93 (10)–110.60 (11) and 107.35 (11)–111.07 (12)°. The Cr—O—Cr angle is 127.96 (12)°. The crystal used was an inversion twin with refined components of 0.510 (19) and 0.490 (19)

(2E)-1-(2,6-Dichloro-3-fluoro­phen­yl)-3-(4-meth­oxy­phen­yl)prop-2-en-1-one

There are two independent mol­ecules in the asymmetric unit of the title compound, C16H11Cl2FO2. The F atom equally populates both meta positions of the 6-dichloro-3-fluoro­phenyl ring in each mol­ecule, resulting in 0.5 occupancy for both the F and H atoms in these positions. The dihedral angle between the mean planes of the benzene rings are 77.5 (2) and 89.8 (8)°in the two mol­ecules. In the crystal, weak C—H⋯F and C—H⋯O inter­actions involving the half-occupied H and F atoms are observed. Weak π–π stacking inter­actions [centroid—centroid distance = 3.150 (2) Å] also contribute to the crystal stability

N-(3-Chloro-4-fluoro­phen­yl)-2-(naphthalen-1-yl)acetamide

In the title compound, C18H13ClFNO, the dihedral angle between the mean planes of the chloro- and fluoro-substituted benzene ring and the naphthalene ring system is 60.5 (8)°. In the crystal, mol­ecules are linked by N—H⋯O hydrogen bonds, forming a zigzag chain along [101]