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The title complex, [Fe2(NCS)4(H2O)6]·3C10H8N6, comprises two FeII atoms octahedrally coordinated and bridged by two aqua O atoms that straddle a crystallographic inversion center, forming a quadrilateral core. The water ligands of the core are involved in hydrogen bonds with the triazole N atoms of the organic mol­ecules, which generates a layer motif in the ab plane. There are π–π stacking inter­actions between benzene rings of 3.490 (6) Å, and between triazole rings of 3.543 (8) and 3.734 (7) Å in neighboring layers, forming a three-dimensional network.

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In the title compound, [Cd(NCS)2(C7H7N5)2(H2O)2], the CdII cation lies on an inversion center and is coordinated by the N atoms of two thiocyanate anions, by N atoms of two 6-(4H-1,2,4-triazol-4-yl)pyridin-2-amine ligands and by the O atoms of two water molecules in a distorted N4O2 octa­hedral geometry. The dihedral angle between the triazole and pyridine rings is 23.15 (12)°. In the crystal, mol­ecules are linked by N—H...N and O—H...S hydrogen bonds. Offset π–π stacking between parallel pyridine rings of adjacent mol­ecules is also observed, the centroid–centroid distance being 3.6319 (14) Å.

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In the title compound, [Co(NCSe)2(C9H7N7)2(H2O)2], the Co2+ cation is coordinated by two seleno­cyanate anions, two 2,6-bis­(4H-1,2,4-triazol-4-yl)pyridine ligands and two water mol­ecules within a slightly distorted N4O2 octa­hedron. The asymmetric unit consists of one Co2+ cation, which is located on a center of inversion, as well as one seleno­cyanate anion, one 2,6-bis­(4H-1,2,4-triazol-4-yl)pyridine ligand and one water mol­ecule in general positions. Inter­molecular O—H...N hydrogen bonds join the complex mol­ecules into layers parallel to the bc plane. The layers are linked by C—H...N and C—H...Se hydrogen bonds into a three-dimensional supra­molecular architecture.

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The title compound, C20H17N3O2S2, was synthesized by the reaction of 2-(1,5-diphenyl-1H-pyrazol-3-yl­oxy)acetic acid and thia­zolidine-2-thione. The C-linked benzene ring, N-linked benzene ring and thia­zolidine-2-thione ring are twisted 31.33 (2), 62.87 (1) and 82.71 (2)°, respectively, from the plane of the bridging 1H-pyrazole ring. The phenyl rings are oriented at a dihedral angle of 72.16 (2)°.
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