catena-Poly[[tetra-kis-(1H-pyrazole-κN(2))copper(II)]-µ-hexa-fluoridosilicato-κ(2)F:F'].

In the title one-dimensional coordination polymer, [Cu(SiF(6))(C(3)H(4)N(2))(4)](n), the Cu(II) atom is coordinated by two hexafluoridosilicate F atoms and four pyrazole N atoms in a distorted trans-CuF(2)N(4) octa-hedral environment. The dihedral angle between the planes of the pyrazlole rings in the asymmetric unit is 74.4 (3)°. The hexa-fluoridosilicate dianion acts as a bridging ligand, connecting the Cu(II) atoms into a [1-10] chain. The Cu and Si atoms lie on special positions with 2/m site symmetry. In the crystal, intra-chain N-H⋯F hydrogen bonds occur and weak C-H⋯F inter-actions link the chains.

catena-Poly[[dichloridocobalt(II)]-µ-4,4'-bis-(benzimidazol-1-yl)biphen-yl].

In the title compound, [CoCl(2)(C(26)H(18)N(4))](n), the Co(II) atom (site symmetry 2) is tetra-hedrally coordinated by two chloride ions and two N atoms from 4,4'-bis-(benzimidazol-1-yl)biphenyl ligands: the complete ligand is generated by crystallographic twofold symmetry. The dihedral angle between the benzene rings is 34.67 (8)° and the angle between the benene ring and the adjacent benzimidazole ring system is 43.26 (10)°. The bridging ligand links the Co(II) atoms into chains propagating in [[Formula: see text]01].

catena-Poly[[dichloridoiron(II)]-µ-4,4''-bis-(benzimidazol-1-yl)-1,1':4',1''-terphen-yl].

In the title coordination polymer, [FeCl(2)(C(32)H(22)N(4))](n), the Fe(II) atom lies on a crystallographic twofold axis and a distorted FeCl(2)N(2) tetra-hedral coordination geometry arises. The complete ligand is generated by crystallographic twofold symmetry, resulting in an infinite one-dimensional architecture along [101].