catena‐Poly­[[bis­(thio­cyanato‐κN)cadmium(II)]‐di‐μ‐thio­urea‐κ4S:S]

The Cd^II ion in the title complex, [Cd(SCN)₂{SC(NH₂)₂}₂]_∞, is situated at a centre of symmetry, and is bound to two N atoms belonging to thio­cyanate groups and to four S atoms of bridging thio­urea ligands. The structure consists of infinite chains of slightly distorted edge‐shared Cd‐centred octahedra. The bridging S atoms of two thio­urea ligands comprise the common edge. Some thermal properties are described.     

catena‐Poly­[[di­aqua­cobalt(II)]‐μ‐oxalato]

Single crystals of the title compound, [Co(C₂O₄)(H₂O)₂]_n, have been prepared by hydro­thermal methods and characterized by X‐ray diffraction analysis. The crystal structure consists of infinite one‐dimensional chains of di­aqua­cobalt(II) units bridged by oxalate groups. These chains lie on twofold symmetry axes parallel to the b axis, and the [Co(C₂O₄)]_n system is nearly planar within experimental error. The cobalt(II) coordination polyhedra are irregular octahedra, with oxalate O atoms at the equatorial positions and water mol­ecules at the axial positions. The chains are linked by hydrogen bonds via the water mol­ecules.     

catena‐Poly­[[dicyan­amido(1,10‐phen­anthroline)copper(II)]‐μ‐dicyan­amido]

The title compound, [Cu(C₂N₃)₂(C₁₂H₈N₂)]_n, has a sheet‐like structure, built by [Cu(phen)(dca)₂]_n (phen is 1,10‐phenanthroline and dca is dicyan­amide) chains which are interconnected by secondary long Cu—N bonds between the chains. The Cu²⁺ ion is in a distorted tetragonal bipyramidal (5 + 1) coordination environment. The sheets stack into the three‐dimensional crystal structure through aromatic interactions between the coordinated phen ligands of adjacent sheets.     

catena‐Poly­[[bis­(nitrato)(pyrimidine)­copper(II)]‐μ‐pyrimidine‐N:N′]

The title compound, [Cu(NO₃)₂(C₄H₄N₂)₂]_n, crystallizes as a linear polymeric compound with one pyrimidine ligand bridging between two Cu^II atoms and a second pyrimidine ligand coordinated in a monodentate manner. The distorted octahedral geometry around the Cu^II atom consists of two pyrimidine N atoms at distances of 2.033 (4) and 2.025 (4) Å, and two nitrate O atoms at distances at 1.987 (3) and 1.973 (3) Å. The apical positions are occupied by an N atom of a bridging pyrimidine ligand [2.291 (4) Å] and a nitrate O atom at a long distance of 2.781 (3) Å. The basal plane is almost planar, with trans angles of 176.23 (14) and 165.34 (15)°.     

catena‐Poly­[[di­chlorozinc(II)]‐μ‐1,3‐di‐4‐pyridyl­propane‐κ2N:N′]

The title compound, [ZnCl₂(bpp)]_n (where bpp is 1,3‐di‐4‐pyridyl­propane, C₁₃H₁₄N₂), has been prepared by the hydro­thermal reaction of ZnCl₂ and bpp at 433 K. The Zn, Cl and central propyl C atom lie on the mirrors of the P2₁/m space group. The molecular structure shows a weave‐like polymeric chain. Each Zn atom is coordinated by two N atoms and two Cl atoms in a distorted tetrahedral geometry, with the Zn—N distance being 2.055 (5) Å and the Zn—Cl distances being 2.239 (3) and 2.247 (2) Å.     

catena‐Poly­[[tetrakis(2‐allyl­tetrazole‐κN4)‐tetra‐μ‐chloro‐tricopper(II)]‐di‐μ‐chloro]

In the crystal structure of the title compound, [Cu₃Cl₆(C₄H₆N₄)₄]_n, there are three Cu atoms, six Cl atoms and four 2‐allyl­tetrazole ligands in the asymmetric unit. The polyhedron of one Cu atom adopts a flattened octahedral geometry, with two 2‐allyl­tetrazole ligands in the axial positions [Cu—N4 = 1.990 (2) and 1.991 (2) Å] and four Cl atoms in the equatorial positions [Cu—Cl = 2.4331 (9)–2.5426 (9) Å]. The polyhedra of the other two Cu atoms have a square‐pyramidal geometry, with three basal sites occupied by Cl atoms [Cu—Cl = 2.2487 (9)–2.3163 (8) and 2.2569 (9)–2.3034 (9) Å] and one basal site occupied by a 2‐allyl­tetrazole ligand [Cu—N4 = 2.028 (2) and 2.013 (2) Å]. A Cl atom lies in the apical position of either pyramid [Cu—Cl = 2.8360 (10) and 2.8046 (9) Å]. The possibility of including the tetrazole N3 atoms in the coordination sphere of the two Cu atoms is discussed. Neighbouring copper polyhedra share their edges with Cl atoms to form one‐dimensional polymeric chains running along the a axis.     

The infinite double‐stranded chain polymer catena‐poly­[[bis­(dicyan­amido)­zinc(II)]‐di‐μ‐1,2‐bis(1,2,4‐triazol‐1‐yl)­ethane‐κ4N4:N4′]

The coordination geometry of the Zn^II atom in the title complex, [Zn(C₂N₃)₂(C₆H₈N₆)₂]_n or [Zn(dca)₂(bte)₂]_n, where bte is μ‐1,2‐bis(1,2,4‐triazol‐1‐yl)­ethane and dca is dicyan­amide, is distorted compressed octahedral, in which the Zn^II atom lies on an inversion center and coordinates four N atoms from the triazole rings of four symmetry‐related bte ligands and two N atoms from two symmetry‐related monodentate dca ligands. The structure is polymeric, with 18‐membered spiro‐fused rings extending in the b direction and each 18‐membered ring involving two inversion‐related bte mol­ecules.     

catena‐Poly­[[tetra­aqua­iron(II)]‐μ‐succinato‐κ2O:O′]

The title complex, {[Fe(C₄H₄O₄)(H₂O)₄]}_n, is an infinite poly­meric compound bridged by the succinate dianion. Two carboxyl­ate groups coordinate in a monodentate manner to the Fe^II atom, in a trans fashion, with an O—Fe—O bond angle of 175.72 (6)° and Fe—O distances of 2.0886 (14) and 2.1008 (15) Å. One of the uncoordinated carboxyl­ate O atom forms an intramolecular hydrogen bond with a coordinated water mol­ecule. Extensive hydrogen bonding between parallel poly­meric complex chains results in a three‐dimensional supramolecular structure.     

catena‐Poly­[[bis­(thio­cyanato‐N)lead(II)]‐μ‐1,2‐bis(4‐pyridyl)ethane‐N:N′]

In the title coordination polymer, [Pb(NCS)₂(C₁₂H₁₂N₂)], the coordination geometry about the Pb^II atom is a distorted octahedron, composed of two N atoms from bpe ligands [bpe is 1,2‐bis(4‐pyridyl)ethane], two other N atoms from NCS^? groups and two neighbouring S atoms through short contacts. The trans‐bpe ligands act as bridges between two Pb^II centres resulting in the formation of a linear chain. The terminal S atoms of the NCS^? ligands make short contacts with the Pb^II atom of neighbouring chains to form an infinite two‐dimensional polymeric structure.     

Poly­[[bis­(pyridine‐κN)copper(II)]‐μ3‐5‐hydroxy­isophthalato‐κ3O:O′:O′′]

In the title compound, [Cu(C₈H₄O₅)(C₅H₅N)₂]_n or [Cu(OH‐BDC)(py)₂]_n (where OH‐H₂BDC is 5‐hydroxy­isophthalic acid and py is pyridine), the Cu atoms are coordinated by two N atoms from the pyridine ligands and by three O atoms from hydroxy­isophthalate ligands in a highly distorted triangular bipyramidal environment, with Cu—O distances in the range 1.941 (4)–2.225 (5) Å and Cu—N distances of 2.014 (6) and 2.046 (6) Å. The [Cu(OH‐BDC)]_n two‐dimensional network is built up from interlocking 22‐, 15‐ and eight‐membered rings via sharing of Cu atoms and O—H⋯O hydrogen bonds. Consolidation of the packing structure is achieved by edge‐ or point‐to‐face C—H⋯π interactions and offset or slipped π–π stacking interactions.     

catena‐Poly­[[chloro(1,10‐phenanthroline‐κ2N,N′)copper(II)]‐μ‐imidazolato‐κ2N:N′]

In the polymeric title compound, [Cu(im)Cl(phen)]_n, where im is the imidazolate anion (C₃H₃N₂) and phen is 1,10‐phenanthroline (C₁₂H₈N₂), each Cu^II ion is five‐coordinated by four basal N atoms (two from two different im anions and two from one phen ligand) and one axial Cl atom, in a distorted square‐pyramidal coordination geometry. Moreover, each im anion bridges two identical {CuCl(phen)}⁺ cations through its two N atoms, resulting in a one‐dimensional zigzag chain along the crystallographic a axis. In addition, pairs of adjacent chains are staggered by π–π interactions, generating a two‐dimensional layer, and neighbouring layers are further linked by two different kinds of C—H⋯Cl interactions, producing a three‐dimensional network.     

Poly­[[copper(II)‐di‐μ‐5‐amino­isophthalato(1–)‐κ4N:O] monohydrate]

The title compound, {[Cu(C₈H₆NO₄)₂]·H₂O}_n, was prepared by the hydro­thermal assembly of 5‐amino­isophthalic acid with copper nitrate. Single‐crystal X‐ray analysis shows that it has a two‐dimensional layer coordination framework, in which the unique Cu atom lies on an inversion centre and adopts a square‐planar geometry, coordinated to two N and two O atoms from symmetry‐related ligands. The water molecule lies on a twofold axis and there are hydrogen‐bonding interactions between the layers.     

The layered structure of poly­[[di‐μ‐chloro‐bis­[chloro(2‐ethyl­tetrazole‐κN4)copper(II)]]‐di‐μ‐2‐ethyl­tetrazole‐κ2N1:N4]

In the polymeric title complex, [CuCl₂(C₃H₆N₄)₂]_n, there are two ligands in the asymmetric unit. The Cu atom adopts an elongated octahedral geometry, with two 2‐ethyl­tetrazole ligands [Cu—N = 2.0037 (16) and 2.0136 (16) Å] and two Cl atoms [Cu—Cl = 2.2595 (6) and 2.2796 (6) Å] in equatorial positions. A Cl atom and a symmetry‐related 2‐ethyl­tetrazole mol­ecule [Cu—Cl = 2.8845 (8) Å and Cu—N = 2.851 (2) Å] lie in the axial positions of the octahedron. One of the two 2‐­ethyltetrazole ligands of the asymmetric unit exhibits bidentate binding to two Cu atoms through two N atoms of the tetrazole ring, whereas the other ligand is coordinated in a monodentate fashion via one tetrazole N atom. The Cu‐atom octahedra form dimer entities by sharing edges with equatorial and axial Cl atoms. The dimers are linked together through the 2‐ethyl­tetrazole ligands to form one‐dimensional polymeric zigzag chains extending along the b axis. The chains are connected into infinite layers parallel to the (10) plane via the 2‐ethyl­tetrazole ligands.     

catena‐Poly­[[bis­(hexa­fluoro­acetyl­acetonato‐κ2O,O′)­zinc(II)]‐μ‐4,4′‐bi­pyridine‐κ2N:N′]

The structure of the title compound, catena‐poly[[bis(1,1,1,5,5,5‐hexafluoropentane‐2,4‐dionato‐κ²O,O′)zinc(III)]‐μ‐4,4′‐bipyridine‐κ²N:N′], [Zn(C₅HF₆O₂)₂(C₁₀H₈N₂)]_n, con­sists of polymeric chains, running in two perpendicular directions, organized as planes normal to the tetragonal axis. The elemental unit of the chains is the zinc(II) coordination polyhedron bisected by a twofold symmetry axis, and thus only half of the unit is independent. The octahedral coordination geometry of the metal centre is composed of two oxy­gen‐chelating (symmetry‐related) hexa­fluoro­acetyl­acetonate groups and two translationally related 4,4′‐bi­pyridine groups, which act as connecting agents in the polymer structure. The stabilization of this architecture of chains and planes is associated with a number of weak C—H⋯O and C—H⋯F hydrogen bonds.     

catena‐Poly­[[di­aqua­(nicotinato‐κ2O,O′)­cadmium(II)]‐μ‐nicotinato‐κ3N:O,O′]

The title compound, [Cd(C₆H₄NO₂)₂(H₂O)₂]_n, forms a one‐dimensional chain structure based on a Cd atom with approximate pentagonal bipyramidal coordination geometry and two nicotinate ligands in different coordination modes. One acts as a tridentate ligand, chelating one Cd atom through the carboxyl­ate group while simultaneously binding to a second symmetry‐related Cd atom through the pyridine N atom; the other acts only as a bidentate ligand through its carboxyl­ate group. Hydro­gen bonds utilizing the coordinated water mol­ecules, uncoordinated nitro­gen and carboxyl­ate O atoms as acceptors link the chains.     

catena‐Poly­[[[μ‐pyrazine‐κ2N:N′‐disilver(I)]‐di‐μ‐pyrazine‐κ4N:N′] bis­(tri­fluoro­methane­sulfonate) dihydrate]

The title compound, {[Ag₂(C₄H₄N₂)₃](CF₃SO₃)₂·2H₂O}_n, is a polymeric pyrazine–silver(I) complex. Each Ag^I ion is three‐coordinated by N atoms of three different pyrazine ligands, forming a T‐shaped coordination configuration. In the crystal structure, uncoordinated water mol­ecules are linked to tri­fluoro­methane­sulfonate anions through intermolecular O—H⋯O hydrogen bonds. There are weaker Ag⋯O interactions involving the water and sulfonate O atoms.     

catena‐Poly­[[di­aqua­cadmium(II)]‐μ‐5‐carboxyimidazole‐4‐carboxylato‐κ4N1,O5:O4,N3]

A new cadmium coordination polymer, [Cd(C₅H₂N₂O₄)(H₂O)₂]_n, possesses a one‐dimensional zigzag chain structure built from Cd^II centers bridged sequentially by pairs of O and N atoms of the 5‐carboxyimidazole‐4‐carboxylate ligand. The Cd^II center is in a distorted octahedral geometry, being coordinated by two O atoms from two coordinated water mol­ecules [Cd—O = 2.322 (7) and 2.364 (7) Å], and by two N atoms [Cd—N = 2.222 (6) and 2.232 (6) Å] and two carboxyl O atoms [Cd—O = 2.383 (6) and 2.414 (6) Å] from two 5‐carboxyimidazole‐4‐carboxylate ligands.     

Poly­[[bis­[aqua(1,10‐phenanthroline)­lanthanum(III)]‐μ‐aqua‐di‐μ‐5‐sulfonatoisophthalato] monohydrate] and poly­[[[tri­aqua­lanthanum(III)]‐μ‐5‐sulfonatoisophthalato] monohydrate]

In the two related polymeric title compounds, {[La₂(sip)₂(phen)₂(H₂O)₃]·H₂O}_n [sip is the 5‐sulfonatoisophthalate trianion (C₈H₃O₇S³⁻) and phen is 1,10‐phenanthroline (C₁₂H₈N₂)], (I), and {[La(sip)(H₂O)₃]·H₂O}_n, (II), the lanthanum(III) ions are nine‐coordinate, with similar distorted monocapped square‐antiprism coordination geometry. The two crystal structures are very different. In (I), the sip anion acts as a pentadentate ligand, one of the coordinated water mol­ecules lies on a twofold axis and further inversion, n‐glide and translation operations generate a two‐dimensional framework. In (II), the sip anion functions as a hexadentate ligand and a three‐dimensional network with trinuclear 24‐membered rings is developed via inversion, n‐glide, twofold‐screw and translation operations. Both structures also have extensive O—H⋯O hydrogen‐bonded networks and π–π interactions.     

Poly­[[bis(1H‐benz­imidazole‐κN3)cadmium(II)]‐μ‐aqua‐μ‐succinato‐κ2O1:O4]

The title compound, [Cd(C₄H₄O₄)(C₇H₆N₂)₂(H₂O)]_n, is a three‐dimensional polymeric complex. The Cd^II atom is located on an inversion centre and assumes an elongated octahedral coordination geometry, with a long Cd—O distance of 2.5381 (5) Å to the coordinated bridging water molecule. The succinate dianion, located on another inversion centre, bridges adjacent Cd atoms to form succinate‐bridged polymeric chains. The coordinated water mol­ecule is located on a twofold axis and links adjacent succinate‐bridged chains to form a water‐bridged polymeric chain.     

catena‐Poly­[[bis­[μ‐1,2‐bis(1‐methyl­tetrazol‐5‐yl)­ethane‐κ2N4:N4′]bis[chloro­copper(II)]]‐di‐μ‐chloro]

In the title compound, [Cu₂Cl₄(C₆H₁₀N₈)₂]_n, the ligand has C₂ symmetry, and the Cu and Cl atoms lie on a mirror plane. The coordination polyhedron of the Cu atom is a distorted square pyramid, with the basal positions occupied by two N atoms from two different ligands [Cu—N = 2.0407 (18) Å] and by the two Cl atoms [Cu—Cl = 2.2705 (8) and 2.2499 (9) Å], and the apical position occupied by a Cl atom [Cu—Cl = 2.8154 (9) Å] that belongs to the basal plane of a neighbouring Cu atom. The [CuCl₂(C₆H₁₀N₈)]₂ units form infinite chains extending along the a axis via the Cl atoms. Intermolecular C—H⃛Cl contacts [C⃛Cl = 3.484 (2) Å] are also present in the chains. The chains are linked together by intermolecular C—H⃛N interactions [C⃛N = 3.314 (3) Å].