catena-Poly[[[triaqua­copper(II)]-μ-pyridine-2,3-dicarboxyl­ato-κ3 N,O 2:O 3] monohydrate]

In the title compound, {[Cu(C7H3NO4)(H2O)3]·H2O}n, the CuII ion is bonded to three water mol­ecules, one N,O-bidentate pyridine-2,3-dicarboxyl­ate dianion and one O-bonded symmetry-generated dianion, resulting in a distorted CuNO5 octa­hedral geometry. The bridging ligand results in an infinite chain. A network of O—H⋯O hydrogen bonds helps to establish the crystal structure

Triazido­[tris­(2-pyridyl-κN)methyl­amine]cobalt(III)

The title compound, [Co(N3)3(C16H14N4)], was synthesized by hydro­thermal reaction of [Co(NH3)6](NO3)3, NaN3 and tris­(2-pyrid­yl)methyl­amine. The structure contains two independent complexes in the asymmetric unit, with closely comparable geometry. The CoIII atoms are hexa­coordinated by three N atoms from the tridentate tris­(2-pyrid­yl)methyl­amine ligands and three azide ions in a fac arrangement. N—H⋯N hydrogen bonds are formed between the amino group and the uncoordinated terminal N atoms of the azide ligands

Tetra­kis(μ-2,4-difluoro­benzoato)bis­[(2,2′-bipyridine)(2,4-difluoro­benzoato)terbium(III)]

In the centrosymmetric dinuclear title compound, [Tb2(C7H3F2O2)6(C10H8N2)2], the TbIII ion is coordinated by an N,N′-bidentate 2,2′-bipyridine mol­ecule, and two O,O′-bidentate 2,4-difluoro­benzoate (dfb) anions. One of the latter also bonds to the second TbIII centre through one of its O atoms. The third dfb anion bonds to one Tb atom from each of its O atoms. Thus, the three dfb species have three different coordination modes. This results in an irregular TbN2O7 coordination sphere for the metal ion. The F atoms and their associated H atoms in the simple bidentate dfb anion are disordered over two sets of sites in a 0.672 (10):0.328 (10) ratio

Poly[(μ-β-hexa­cosa­oxidoocta­molybdato)tetra­kis­[3-(2-pyrid­yl)pyrazole]­dizinc(II)]

In the hydro­thermally prepared title compound, [Mo8Zn2O26(C8H7N3)4]n or {[Zn(C8H7N3)2]2(Mo8O26)}n, the ZnII atom is coordinated by two N,N′-bidentate 3-(2-pyrid­yl)pyrazole ligands and two O atoms from adjacent octa­molybdate polyanions, generating a distorted cis-ZnO2N4 octa­hedral geometry for the divalent metal ion. The complete octa­molbydate unit is generated by crystallographic inversion symmetry. The polyhedral connectivity leads to [100] chains in the crystal and N—H⋯O and N—H⋯(O,O) hydrogen bonds help to consolidate the packing

catena-Poly[[aqua­(2,2′-bipyridine-κ2 N,N′)copper(II)]-μ-5-nitro­isophthalato-κ3 O 1,O 1′:O 3]

In the asymmetric unit of the title compound, [Cu(C8H3NO6)(C10H8N2)(H2O)]n, there are two symmetry-independent one-dimensional coordination polymers related by a non-crystallographic inversion center. Within the polymers, the CuII atoms, coordinated by the water mol­ecule and the chelating 2,2′-bipyridine ligands, are bridged by 5-nitro­benzene-1,3-dicarboxyl­ate dianions which act as tridentate ligands; the carboxyl­ate groups exhibit monodentate and symmetric bidentate coordination modes. The CuII atoms show a strongly distorted octa­hedral coordination geometry. In the crystal structure, the two symmetry-independent coordination polymers form another one-dimensional polymeric structure via O—H⋯O hydrogen bonds between coordinated water mol­ecules and carboxyl­ate groups

Triaqua­(2,2′-bipyridine-κ2 N,N′)(5-nitro­isophthalato-κO 1)zinc(II) monohydrate

In the title compound, [Zn(C8H3NO6)(C10H8N2)(H2O)3]·H2O, the ZnII cation is hexa­coordinated by a chelating 2,2′-bipyridine ligand, one carboxyl­ate O atom from a 5-nitro­isophthalate dianion and three water mol­ecules in a slightly distorted octa­hedral geometry. The structure contains isolated neutral complexes, in contrast to coordination polymers formed by MnII, CoII and CuII with the same ligand set. An extensive network of hydrogen bonds is formed between the water mol­ecules and the carboxyl­ate groups

(4-Amino­benzene­sulfonato)­hepta­aqua­gadolinium(III) 4-amino­benzene­sulfonate nitrate 4,4′-bipyridyl tetra­solvate dihydrate

In the title compound, [Gd(C6H6O3S)(H2O)7](C6H6O3S)(NO3)·4C10H8N2·2H2O, the GdIII ion is octa­coordinated by seven water mol­ecules and one O-bonded 4-amino­benzene­sulfonate anion in a square-anti­prismatic arrangement. In the crystal, the components are linked by N—H⋯O, O—H⋯N and O—H⋯O hydrogen bonds

Diazido­bis(2,2′-biimidazole)iron(II)

In the title compound, [Fe(N3)2(C6H6N4)2], the Fe atom is bonded to two azide ions located in axial positions and to two equatorially positioned bidentate biimidazole ligands, forming a slightly distorterd octa­hedron. The non-H atoms of the equatorial plane are coplanar, with a mean deviation of 0.0355 (2) Å. The FeII cation lies on an inversion centre. Thus, the asymmetric unit comprises one half-mol­ecule

Bis{tris­[3-(2-pyrid­yl)-1H-pyrazole]nickel(II)} dodeca­molybdo(V,VI)phosphate hexa­hydrate

The hydro­thermally prepared title compound, [Ni(C8H7N3)3]2[PMo12O40]·6H2O, is a member of the isotypic series [(M(C8H7N3)3]2[PMo12O40]·6H2O where M is Mn, Cd, and Fe. The Ni2+ cation is in a distorted octa­hedral environment, coordinated by six N atoms from three chelating 3-(2-pyrid­yl)-1H-pyrazole ligands. In the one-electron reduced heteropolyanion, two O atoms of the central PO4 group ( symmetry) are equally disordered about an inversion centre. N—H⋯O and O—H⋯O hydrogen bonds contribute to the crystal packing. Compared with the isotypic structures, the main difference is related with the M—N bond lengths, whereas all other bond lengths, angles and the hydrogen-bonding motifs are very similar

Bis{tris­[3-(2-pyrid­yl)-1H-pyrazole]iron(II)} dodeca­molybdo(V,VI)phosphate hexa­hydrate

Crystals of the title compound, [Fe(C8H7N3)3]2[PMo12O40]·6H2O, prepared under hydro­thermal conditions, are isotypic with the Mn2+ and Cd2+ analogues. The Fe2+ cation is in a distorted octa­hedral coordination by six N atoms from three chelating 3-(2-pyrid­yl)-1H-pyrazole ligands. The heteropoly­anion [PMo12O40]4− is a one-electron reduced species in which two O atoms of the central PO4 group ( symmetry) are equally disordered about an inversion centre. N—H⋯O and O—H⋯O hydrogen bonds make a contribution to the crystal packing. The Fe—N bond lengths [2.085 (19)—2.15 (2) Å] are somewhat shorter than the Mn—N and Cd—N bond lengths [2.224 (6)–2.283 (5) and 2.316 (7)–2.334 (6) Å, respectively]. All other bond lengths and angles and the hydrogen-bonding motifs are very similar in the isotypic structures