Kim Potgieter

The Reaction of Rhenium(V) Cores with a Tetradentate Schiff Base. The Isolation of '3+3' and '4+0' Complexes of Rhenium(V)

The reaction of the potentially tetradentate N 4-donor ligand N,N′-bis[(2-aminophenyl)methylidene]ethane-1,2-diamine (H2ane) with various rhenium(V) precursors led to the formation of different rhenium(V) complexes. With trans-[ReOBr3(PPh3)2], the unusual ‘3+3’ complex cation [Re(tnn)(Htnn)]2+ (H2tnn = N-(2-aminophenylmethylidene)ethane-1,2-diamine) was isolated. With trans-[ReO2(py)4]Cl, the complex [ReO(dne)] was found (H3dne = N 1-2-aminobenzyl-N 2-2-aminobenzylideneethane-1,2-diamine), and the cationic complex [ReO(ane)]+ was formed from cis-[ReO2I(PPh3)2]. These products were characterized by 1H NMR and IR spectroscopy, and by X-ray diffraction.

2-({[4-(1,3-Benzothia­zol-2-yl)phen­yl]amino}methyl)­phenol

In the title compound, C20H16N2OS, the aniline substituent essentially coplanar with the benzothiazole moiety (with an r.m.s. deviation of all fitted non-H atoms of 0.0612 Å). The phenol group is almost perpendicular to the benzothiazolylaniline group, with an interplanar angle of 88.36 (2)°. In the crystal, molecules aggregate as centrosymmetric dimers by pairs of O—H⋯N hydrogen bonds. C—H⋯O contacts and N—H⋯π(arene) interactions also occur.

2-(1,2-Dihydro-2-oxopyridin-3-yl)-1,3-benzothia-zol-3-ium bromide monohydrate.

The title hydrated molecular salt, C12H9N2OS+·Br−·H2O, the aza-substituted six-membered ring is present as its keto tautomer instead of its aromatic tautomer. The dihedral angle between the fused ring system and the pyridinone ring in the cation is 6.91 (6)°. In the crystal, bifurcated N—H⋯(O,Br) and O—H⋯Br hydrogen bonds and S⋯O contacts [S⋯O = 3.0526 (10) Å] connect the components into a three-dimensional network. The closest centroid–centroid distance between two π-systems is 3.7420 (7) Å between two benzene rings.

4-((E)-{2-[N-(1,5-Dimethyl-3-oxo-2-phenyl-2,3-dihydro-1H-pyrazol-4-yl)carboximido­yl]benzyl­idene}amino)-1,5-dimethyl-2-phenyl-2,3-dihydro-1H-pyrazol-3-one

The title compound, C30H28N6O2, is a symmetric diimine derived from ortho-dibenzaldehyde. Both C=N bonds are (E)-configured. The terminal N-bonded phenyl groups adopt staggered conformations relative to their respective parent heterocycles, the relevant least-squares planes intersect at angles of 32.35 (11) and 38.59 (10)°. In the crystal, C—H⋯O contacts connect the molecules into chains along the b axis and give rise to a C 1 1(14)C 1 1(14) and a R 2 2(12) pattern on different levels of graph-set analysis. The shortest intercentroid distance between two centroids was found at 4.2074 (11) Å between the two five-membered heterocycles.

2-[5-(Benzo[d]thia-zol-2-yl)thio-phen-2-yl]benzo[d]thia-zole.

The structure of the title compound, C18H10N2S3, consists of a central thiophene ring and two terminal thiazole rings. The two S atoms of the thiazole rings are trans to the thiophene S atom sulfur. The thiazole rings are approximately coplanar with the thiophene ring, with dihedral angles of 6.23 (11) and 4.81 (11)° between them. In the crystal, zigzag chains are formed along [010] by weak C—H⋯N interactions.