Tian-Tian Pan

Quinolinium tri­chloro­(quinoline-κN)­cobaltate(II)

The title compound, (C9H8N)[CoCl3(C9H7N)], consists of CoII complex anions and quinolinium cations. The CoII complex anions assume tetrahedral coordination geometry and are hydrogen bonded to the quinolinium cations to form centrosymmetric supramolecular dimer. π–π stacking occurs between the quinoline and quinolinium rings.

Bis(μ-2,4-dihy­droxy­benzoato-κ2O:O′)bis­[aqua­(2,4-dihy­droxy­benzoato-κO)(1,10-phenanthroline-κ2N,N′)cadmium(II)]

In the title centrosymmetric dimeric CdII complex, [Cd2(C7H5O4)4(C12H8N2)2(H2O)2], the CdII cation is coordinated by a bidentate phenanthroline (phen) ligand, three dihydroxybenzoate (dhba) anions and one water molecule in a distorted CdN2O4 octahedral geometry. Among the dhba anions, two anions bridge two CdII cations to form the dimeric complex with significant different Cd—O bond distances of 2.2215 (19) and 2.406 (2) Å. The centroid–centroid distance of 3.4615 (19) Å between two nearly parallel benzene rings of the dhba and phen ligands coordinating to the same CdII cation indicates the existence of intramolecular π–π stacking in the complex. Extensive O—H⋯O hydrogen bonding and intermolecular weak C—H⋯O hydrogen bonding help to stabilize the crystal structure. One hydroxy group of the monodentate dhba ligand is disordered over two sites with a site-occupancy ratio of 0.9:0.1.

catena-Poly[[bis­(1H-benzimidazole-κN3)cobalt(II)]-μ-terephthalato-κ3O1,O1′:O4]

In the title compound, [Co(C8H4O4)(C7H6N2)2]n, the terephthalate dianions bridge CoII ions through terminal carboxyl groups to form polymeric complex chains; one carboxyl group coordinates in a monodentate manner and the other chelates to the Co atom. Two benzimidazole ligands also coordinate to the Co atom to complete a distorted trigonal–bipyramidal coordination geometry. The crystal packing is stabilized by N—H⋯O hydrogen bonds and π–π stacking involving the benzimidazole ligands, with a face-to-face separation of 3.454 (11) A.