Wenrui He

Bis(tri-2-pyridyl-amine)-nickel(II) bis-(perchlorate).

In the title compound, [Ni(C15H12N4)2](ClO4)2, the NiII atom lies on an inversion center and is octahedrally coordinated by the N atoms of two tridentate tri-2-pyridylamine ligands. The two perchlorate anions are disordered over two sites with a refined occupancy ratio of 0.528 (19):0.472 (19).

Di-μ2-cyanido-dicyanidobis{2,2′-[ethane-1,2-diylbis(nitrilo­methyl­idyne)]diphenolato}(1,4,8,11-tetra­azacyclo­tetra­deca­ne)dichromium(III)nickel(II) methanol disolvate

In the title compound, [Cr2Ni(C16H14N2O2)2(CN)4(C10H24N4)]·2CH3OH, each [Cr(salen)(CN)2] unit {salen is 2,2′-[ethane-1,2-diylbis(nitrilomethylidyne)]diphenolate} acts as a monodentate ligand through one of its two cyanide groups N bound to a central [Ni(cyclam)]2+ core (cyclam is 1,4,8,11-tetraazacyclotetradecane). Each CrIII ion is coordinated by two N and two O atoms from a salen ligand situated in the equatorial plane with two trans cyanide C atoms, yielding a distorted octahedral coordination geometry. The NiII atom lies on an inversion center and is octahedrally coordinated by a cyclam ligand lying in the equatorial plane and by two cyanide N atoms. The asymmetric unit contains one half of the complex molecule and a methanol solvent molecule. In the crystal structure, the complex molecule is linked to the methanol solvent molecules via O—H⋯O and N—H⋯O hydrogen bonds. Individual complex molecules are linked by C—H⋯N hydrogen bonds, forming chains along b.

3-Amino-benzonitrile-3,5-dinitro-benzoic acid (1/1).

The asymmetric unit of the title co-crystal, C7H6N2·C7H4N2O6, contains two formula units of both components. The crystal structure is stabilized by intermolecular O—H⋯O, N—H⋯O, N—H⋯N and C—H⋯O hydrogen bonds, generating a two-dimensional wave-like network. π–π stacking interactions [centroid–centroid distances = 3.702 (2), 3.660 (2)and 3.671 (2) Å] stabilize the crystal packing.

cis-Diaqua­bis(2,2′,2′′-tripyridylamine)zinc(II) bis­(perchlorate)

In the title compound, [Zn(2,2′,2′′-tpa)2(H2O)2](ClO4)2 (2,2′,2′′-tpa is 2,2′,2′′-tripyridylamine, C15H12N4), the Zn center lies on a twofold axis and is coordinated octahedrally by two water molecules and two bidentate 2,2′,2′′-tpa ligands. The perchlorate anions are linked to the coordinated water molecules in the complex cations via O—H⋯O hydrogen bonds.