Synthesis and crystal structure of structurally different cadmium selenocyanate and thiocyanate coordination compounds containing 3‐chloropyridine as ligand

Four compounds with the composition Cd(NCSe)2(3-ClPy)4 (1), [Cd(NCSe)2(3-ClPy)2] ⋅ 3-ClPy (2), Cd(NCSe)2(3-ClPy)2 (3) and Cd(NCSe)2(3-ClPy) (4) with 3-ClPy = 3-chloropyridine were synthesized. In the structure of 1 discrete complexes are observed, whereas in 2 the Cd cations are linked by pairs of selenocyanato anions into chains and between the chains 3-chloropyridine solvate molecules are embedded. In compound 3 each two Cd cations are linked by pairs of anionic ligands into dinuclear units, that are further connected into layers by μ-1,3 single bridging selenocyanate anions. In compound 4, both, octahedrally and tetrahe- drally coordinated Cd cations are present, that are linked by μ-1,3- bridging anionic ligands into a three-.dimensional network. Thermoanalytical investigations prove that compound 1 loses the 3-chloropyridine ligands stepwise upon heating and transforms into compound 4 via compound 3 as an intermediate. Further investigations show that the thiocyanate analogue Cd(NCS)2(3-ClPy) 5 that is not reported in the literature can also be prepared. Since no single crystals were available, the structure was solved from PXRD data and refined using the Rietveld method, which revealed that this compound is an isomer of 4. In its crystal structure the Cd cations are linked by μ-1,3(N,S) and μ-1,3,3(N,S,S)-bridging anionic ligands into chains that are further connected via Cd2S2 rings into double chains

Poly[(μ6-naphthalene-1,4-dicarboxyl­ato-κ6 O 1:O 1′:O 1′:O 4:O 4′:O 4′)iron(II)]

In the title compound, [Fe(C12H6O4)]n, the FeII atom is coordinated by six O atoms from six symmetrically equivalent naphthalene-1,4-dicarboxyl­ate ligands in a strongly distorted octa­hedral geometry. These octa­hedra are connected via common edges into chains that elongate along the a axis, with Fe⋯Fe distances of 2.9712 (4) and 2.9724 (4) Å. The chains are linked via the naphthalene-1,4-dicarboxyl­ate ligands into a three-dimensional coordination network

Poly[(μ-4,4′-bipyridine)(μ-naph­tha­lene-1,4-dicarboxyl­ato)iron(II)]

The asymmetric unit of the title compound, [Fe(C12H6O4)(C10H8N2)], consists of two independent Fe(II) atoms, two naphthalene-1,4-dicarboxyl­ate anions and two 4,4′-bipyridine ligands. The Fe(II) atoms are each coordinated by four O atoms of the naphthalene-1,4-dicarboxyl­ate anions and two N atoms of the 4,4′-bipyridine ligands within a distorted octa­hedron. Two Fe(II) atoms are bridged via the carboxyl­ate groups of two symmetry-related anions into dimers, which are further connected into chains. These chains are linked by additional anions into layers that are finally connected by the 4,4′-bipyridine ligands into a three-dimensional coordination network

Dibromido(di-2-pyridyl disulfide-κ2 N,N′)zinc(II)

The molecular structure of the title compound, [ZnBr2(C10H8N2S2)], contains a seven-membered chelate ring in which the zinc atom is coordinated by two bromide ions and by the two pyridyl N atoms of a single 2,2′-dipyridyldisulfide (dpds) ligand within a slightly distorted tetra­hedron. As is usual for this type of complex, the disulfide group does not participate in zinc coordination. The chelate complexes are connected via weak inter­molecular C—H⋯Br hydrogen bonding into chains, which extend in the [010] direction

Synthesis, crystal structure and thermal properties of bis(acetonitrile-κN)bis(3-bromopyridine-κN)bis(thiocyanato-κN)cobalt(II)

Funding Information: Financial support by the State of Schleswig-Holstein and the Deutsche Forschungsgemeinschaft is gratefully acknowledged. Funding for this research was provided by: Deutsche Forschungsgemeinschaft (grant No. NA 720/5-2).Peer reviewedPublisher PD

A triclinic polymorph of poly[[bis­[μ-1,2-bis­(pyridin-4-yl)ethene-κ2 N:N′]bis­(thio­cyanato-κN)cobalt(II)] 1,2-bis­(pyridin-4-yl)ethene monosolvate]

In the crystal structure of the title compound, [Co(NCS)2(C12H10N2)2]·C12H10N2, the CoII cations are octa­hedrally coordinated by two terminally N-bonded thio­cyanate anions and four 1,2-bis­(pyridin-4-yl)ethene (bpe) ligands. The asymmetric unit consists of three crystallographically independent CoII cations, six thio­cyanate anions and six coordinating bpe ligands in general positions. Additionally, three non-coordin­ating bpe ligands are present in the asymmetric unit with two of them located on a center of inversion. The CoII cations are connected by the bpe ligands into layers parallel to the bc plane. The crystal investigated was non-merohedrically twinned, with a fractional contribution of 0.261 (2) for the minor domain

Polymeric potassium triformatocobalt(II)

In the crystal structure of the title compound, poly[tri-μ-formato-cobalt(II)potassium], [CoK(CHO2)3]n the Co2+ cations are coordinated by six O-bonded formate anions in an octa­hedral coordination mode and the K+ cations are eightfold coordinated by seven O-bonded formate anions within irregular polyhedra. The Co2+ cations are connected by bridging formate anions into a three-dimensional coordination network in which the K+ cations are embedded. The asymmetric unit consits of one Co2+ cation located on a center of inversion, one K+ cation located on a twofold axis and two crystallographically independent formato anions, of which one is located on a twofold axis and the other occupies a general position

Crystal structure of di­ethano­lbis(thio­cyanato)­bis(urotropine)cobalt(II) and tetra­ethano­lbis(thio­cyanato)­cobalt(II)–urotropine (1/2)

The reaction of one equivalent Co(NCS)$_{2}$ with four equivalents of urotropine (hexamethylenetetramine) in ethanol leads to the formation of two compounds, namely, bis(ethanol-$\kappa$O)bis(thiocyanato-$\kappa$N)bis(urotropine-$\kappa$N)cobalt(II), [Co(NCS)$_{2}$(C$_{6}$H$_{12}$N$_{4}$)$_{2}$(C$_{2}$H$_{6}$O)$_{2}$] ($\textbf{1}$), and tetrakis(ethanol-$\kappa$O)bis(thiocyanato-$\kappa$N)cobalt(II)–urotropine (1/2), [Co(NCS)$_{2}$(C$_{2}$H$_{6}$O)$_{4}$]$\cdot$2C$_{6}$H$_{12}$N$_{4}$ ($\textbf{2}$). In $\textbf{1}$, the Co cations are located on centers of inversion and are sixfold coordinated by two terminal N-bonded thiocyanate anions, two ethanol and two urotropine ligands whereas in $\textbf{2}$ the cobalt cations occupy position Wyckoff position c and are sixfold coordinated by two anionic ligands and four ethanol ligands. Compound $\textbf{2}$ contains two additional urotropine solvate molecules per formula unit, which are hydrogen bonded to the complexes. In both compounds, the building blocks are connected via intermolecular O—H$\cdots$N ($\textbf{1}$ and $\textbf{2}$) and C—H$\cdots$S ($\textbf{1}$) hydrogen bonding to form three-dimensional networks

Bis(dicyanamido-κN)tetra­kis­(pyridine-κN)nickel(II)

In the crystal structure of the title compound, [Ni(C2N3)2(C5H5N)4], the NiII cations are coordinated by four pyridine ligands and two dicyanamide anions into discrete complexes. The shortest Ni⋯Ni separation is 8.1068 (10) Å. The structure is pseudo-centrosymmetric and can also be refined in the space group C2/c in which both anionic ligands are strongly disordered and the refinement leads to significantly poorer reliability factors

Poly[(μ-4,4′-bipyridine)(μ-naphthalene-1,4-dicarboxyl­ato)manganese(II)]

In the crystal structure of the title compound, [Mn(C12H6O4)(C10H8N2)]n, the Mn atoms are each coordinated by four O atoms of naphthalene-1,4-dicarboxyl­ate anions and two N atoms of two symmetry-related 4,4′-bipyridine ligands within a strongly distorted octa­hedra. Two of the O atoms originate from one naphthalene-1,4-dicarboxyl­ate anion, whereas the remaining two O atoms derive from two symmetry-equivalent naphthalene-1,4-dicarboxyl­ate anions. Two Mn atoms are connected via the anions into dimers, which are further linked by the anions and the N-donor ligands into a three-dimensional coordination network