Trichlorido(dimethyl sulfoxide-κO)(di-2-pyridyl-amine-κ(2)N,N')indium(III).

In the title compound, [InCl(3)(C(10)H(9)N(3))(C(2)H(6)OS)], the In(III) atom is six-coordinated in a distorted octa-hedral geometry by two N atoms from a chelating di-2-pyridyl-amine ligand, one O atom from a dimethyl sulfoxide ligand and three Cl atoms. Inter-molecular C-H⋯Cl hydrogen bonds and π-π contacts between the pyridine rings [centroid-centroid distance = 3.510 (3) Å] are present in the crystal.

cis-Chloridobis(4,4'-dimethyl-2,2'-bipyridine-κ(2)N,N')oxidovanadium(IV) chloride ethanol monosolvate monohydrate.

In the title compound, [VClO(C(12)H(12)N(2))(2)]Cl·C(2)H(5)OH·H(2)O, the V(IV) atom is six-coordinated in a distorted octa-hedral geometry by four N atoms from two 4,4'-dimethyl-2,2'-bipyridine ligands, one O atom and one Cl atom. In the crystal, O-H⋯Cl, C-H⋯O and C-H⋯Cl hydrogen bonds and π-π contacts between the pyridine rings [centroid-centroid distances = 3.7236 (17) and 3.6026 (19) Å] stabilize the structure. Intra-molecular C-H⋯O and C-H⋯Cl hydrogen bonds are also present.

Dibromido(6,6'-dimethyl-2,2'-bipyridine-κ(2)N,N')cadmium.

In the title compound, [CdBr(2)(C(12)H(12)N(2))], the Cd(II) atom is four-coordinated in a distorted tetra-hedral geometry by two N atoms from a 6,6'-dimethyl-2,2'-bipyridine ligand and two terminal Br atoms. In the crystal, C-H⋯Br hydrogen bonds and π-π stacking inter-actions between the pyridine rings [centroid-centroid distance = 3.763 (5) Å] are present.

Trichlorido(4,4'-dimethyl-2,2'-bipyridine-κ(2)N,N')(methanol-κO)indium(III) methanol monosolvate.

In the title compound, [InCl(3)(C(12)H(12)N(2))(CH(3)OH)]·CH(3)OH, the In(III) atom is six-coordinated in a distorted octa-hedral geometry by two N atoms from a chelating 4,4'-dimethyl-2,2'-bipyridine ligand, one O atom from a methanol mol-ecule and three Cl atoms. In the crystal, inter-molecular O-H⋯O and O-H⋯Cl hydrogen bonds link the complex and solvent methanol mol-ecules. Intra-molecular C-H⋯Cl hydrogen bonds are also present in the complex.

Bis(acetato-κO)bis-(2-pyridine-aldoxime-κ(2)N,N')cadmium.

In the title mol-ecule, [Cd(CH(3)COO)(2)(C(6)H(6)N(2)O)(2)], the Cd(II) cation is N,N'-chelated by two 2-pyridine-aldoxime ligands and coordinated by two acetate anions in a distorted octa-hedral geometry. The hy-droxy groups of the 2-pyridine-aldoxime ligands link to the acetate anions via intra-molecular O-H⋯O hydrogen bonds. Weak inter-molecular C-H⋯O hydrogen bonds occur in the crystal.

catena-Poly[[tetra-aqua-copper(II)]-µ-pyrazine-2-carboxamide-κ(3)N(4):N(1),O-[bis-(sulfato-κO)copper(II)]-µ-pyrazine-2-carboxamide-κ(3)N(1),O:N(4)].

In the crystal of the title polymeric compound, [Cu(2)(SO(4))(2)(C(5)H(5)N(3)O)(2)(H(2)O)(4)](n), two independent Cu(II) atoms are located on individual inversion centers. One Cu(II) atom is coordinated by four water mol-ecules and two pyrazine-2-carboxamide ligands in a distorted O(4)N(2) octa-hedral geometry; the other is N,O-chelated by two pyrazine-2-carboxamide ligands and further coordinated by two sulfate anions in a distorted O(4)N(2) octa-hedral geometry. The pyrazine-2-carboxamide ligands bridge the Cu(II) atoms to form a polymeric chain running along [110]. The crystal structure features N-H⋯O, O-H⋯O and weak C-H⋯O hydrogen bonds.

Dibromido(dimethyl sulfoxide-κO)(6-methyl-2,2'-bipyridine-κ(2)N,N')cadmium.

In the title compound, [CdBr(2)(C(11)H(10)N(2))(C(2)H(6)OS)], the Cd(II) atom is five-coordinated in a distorted trigonal-bipyramidal geometry by two N atoms from a 6-methyl-2,2'-bipyridine ligand, one O atom from a dimethyl sulfoxide ligand and two Br atoms. An intra-molecular C-H⋯O hydrogen bond occurs. The crystal structure is stabilized by C-H⋯Br hydrogen bonds and π-π contacts between the pyridine rings [centroid-centroid distances = 3.582 (5) and 3.582 (5) Å].

Dibromido(4,4'-dimethyl-2,2'-bipyridine-κ(2)N,N')(dimethyl sulfoxide-κO)cadmium.

In the title compound, [CdBr(2)(C(12)H(12)N(2))(C(2)H(6)OS)], the Cd(II) atom is five-coordinated in a distorted trigonal-bipyramidal geometry by two N atoms from one 4,4'-dimethyl-2,2'-bipyridine (DMBP) ligand, one O atom from a dimethyl sulfoxide (DMSO) ligand and two Br atoms. A weak intra-molecular C-H⋯O hydrogen bond occurs between the DMBP and DMSO ligands. π-π stacking between pyridine rings [centroid-centroid distances = 3.682 (3) and 3.598 (3) Å] is observed in the crystal.

Diaqua-bis-(nitrato-κ(2)O,O')bis-(pyrazine-2-carboxamide-κN(4))cadmium-pyrazine-2-carboxamide (1/2).

In the title compound, [Cd(NO(3))(2)(C(5)H(5)N(3)O)(2)(H(2)O)(2)]·2C(5)H(5)N(3)O, the Cd(II) cation is located on a twofold rotation axis and is coordinated by two pyrazine-2-carboxamide ligands and two water mol-ecules and chelated by two nitrate anions in a distorted square-anti-prismatic geometry. Extensive inter-molecular N-H⋯O, N-H⋯N, O-H⋯O and O-H⋯N hydrogen bonds, as well as weak inter-molecular C-H⋯N and C-H⋯O inter-actions occur in the crystal. π-π stacking between between pyrazine rings of coordinating ligands and lattice molecules [centroid-centroid distance = 3.5669 (14) Å] may further stabilize the structure.

catena-Poly[[(5,5'-dimethyl-2,2'-bipyridine-κ(2)N,N')cadmium]-di-µ-bromido].

In the crystal of the title polymeric compound, [CdBr(2)(C(12)H(12)N(2))](n), the Cd(II) cation is located on a twofold rotation axis. The Cd(II) cation is six-coordinated in a distorted octa-hedral geometry formed by two N atoms from the 5,5'-dimethyl-2,2'-bipyridine ligand and four bridging Br(-) anions. The bridging function of the Br(-) anions leads to a polymeric chain running along the c axis.

catena-Poly[[bis-(pyridine-3-carb-oxy-lic acid-κN)mercury(II)]-di-µ-chlorido].

In the title compound, [HgCl(2)(C(6)H(5)NO(2))(2)](n), the Hg(II) cation is located on an inversion center and is six-coordinated in a distorted octa-hedral geometry by two N atoms from two pyridine-3-carb-oxy-lic acid mol-ecules and four bridging Cl(-) anions. The bridging function of the Cl(-) anions leads to polymeric chains running along the a axis. One Hg-Cl bond is much longer than the other. In the crystal, O-H⋯O and weak C-H⋯Cl hydrogen bonds are observed.

Dibromidobis(pyrazine-2-carboxamide-κN(4))zinc.

The title complex, [ZnBr(2)(C(5)H(5)N(3)O)(2)], shows crystallographic mirror symmetry with the Zn atom and the two bromine ligands located on the mirror plane. The Zn atom is four-coordinated in a distorted tetra-hedral fashion by two N atoms from two pyrazine-2-carboxamide ligands and two Br atoms. Only one of the amino H atoms is involved in an N-H⋯O hydrogen bond. The crystal packing is further stabilized by weak N-H⋯N and C-H⋯O inter-actions.

Dichloridobis(pyrazine-2-carboxamide-κN(4))zinc(II).

In the crystal of the title compound, [ZnCl(2)(C(5)H(5)N(3)O)(2)], the mol-ecule has m symmetry, with the Zn(II) cation and Cl(-) anions located on the mirror plane. The Zn(II) cation is coordinated by two Cl(-) anions and two pyrazine-2-carboxamide ligands in a distorted ZnCl(2)N(2) tetra-hedral geometry. The two pyrazine rings are nearly perpendicular to each other [dihedral angle = 86.61 (10)°]. Inter-molecular N-H⋯O and N-H⋯N hydrogen bonds and weak C-H⋯O inter-actions stabilize the crystal packing.

catena-Poly[[[aqua-(pyrazine-2-carboxamide-κ(2)N(1),O)zinc]-µ-pyrazine-2-carboxamide-κ(3)N(1),O:N(4)] dinitrate].

In the crystal of the title compound, {[Zn(C(5)H(5)N(3)O)(2)(H(2)O)](NO(3))(2)}(n), the Zn(II) cation is N,O-chelated by two pyrazine-2-carboxamide (PCA) ligands and is further coordinated by one water mol-ecule and by one pyrazine-N atom from an adjacent PCA ligand in a distorted ZnN(3)O(3) octa-hedral geometry. One of the two independent PCA ligands bridges two Zn(II) cations, forming a zigzag polymeric chain running along the c axis. In the crystal, the NO(3) (-) anions link to the chain via O-H⋯O and N-H⋯O hydrogen bonding. Weak inter-molecular C-H⋯O inter-actions also occur.

catena-Poly[[(2-amino-pyrimidine-κN(1))(thio-cyanato-κS)mercury(II)]-µ-thio-cyanato-κ(2)S:N].

In the title coordination polymer, [Hg(NCS)(2)(C(4)H(5)N(3))], the Hg(II) atom is four-coordinated by one aromatic N atom from a 2-amino-pyrimidine ligand, one S atom from a terminal thio-cyanate ligand, and one S atom and one N atom from a bridging thio-cyanate ligand. The crystal structure features polymeric chains running along the b axis which are stabilized by N-H⋯N hydrogen bonds.

catena-Poly[[diiodidomercury(II)]-µ(2)-2-amino-pyrazine-κN:N].

In the crystal of the title polymeric compound, [HgI(2)(C(4)H(5)N(3))](n), the Hg(II) cation is located on a twofold rotation axis and is coordinated by two I(-) anions and two 2-amino-pyrazine ligands in a distorted HgI(2)N(2) tetra-hedral geometry. In the crystal, the 2-amino-pyrazine ligand is equally disordered over two positions about an inversion center, and bridges the Hg(II) cations with pyrazine N atoms to form a polymeric chain running along the c axis. In the polymeric chain, the amino groups link to the coordinated I(-) anions via inter-molecular N-H⋯I hydrogen bonds.

Trichlorido(5,5'-dimethyl-2,2'-bipyridine-κ(2) N,N')(dimethyl-formamide-κO)indium(III) hemihydrate.

The asymmetric unit of the title compound, [InCl3(C12H12N2)(C3H7NO)]·0.5H2O, contains two independent In(III) complex mol-ecules with similar structures and one lattice water mol-ecule. In each complex mol-ecule, the In(III) atom is six-coordinated in a distorted octa-hedral geometry, formed by two N atoms from the chelating 5,5'-dimethyl-2,2'-bipyridine ligand, one O atom from a dimethyl-formamide and three facial Cl atoms. In the crystal, the lattice water mol-ecule is linked to the complex mol-ecules via O-H⋯Cl hydrogen bonds. Further weak C-H⋯Cl and C-H⋯O hydrogen bonds result in the formation of a three-dimensional structure.

Dibromido(6-methyl-2,2'-bipyridine-κ(2) N,N')cobalt(II).

In the mol-ecule of the title compound, [CoBr2(C11H10N2)], the Co(II) atom is four-coordinated in a distorted tetra-hedral geometry by two N atoms from a chelating 6-methyl-2,2'-bipyridine ligand and two terminal Br atoms. In the crystal, π-π stacking inter-actions between the pyridine rings along the a-axis direction [centroid-centroid distance = 3.761 (7) Å] and C-H⋯Br hydrogen bonds in the bc plane together generate the three-dimensional packing.

Di-µ-bromido-bis-[bromido(4,7-diphenyl-1,10-phenanthroline-κ(2) N,N')cadmium].

The title compound, [Cd2Br4(C24H16N2)2], consists of a centrosymmetric dimeric unit in which two Br atoms bridge two Cd(II) atoms, forming a four-membered ring. A terminal Br atom and a bidentate chelating 4,7-diphenyl-1,10-phenanthroline ligand complete a square-pyramidal geometry for the Cd(II) atom. In the crystal, C-H⋯Br hydrogen bonds and π-π contacts between the pyridine and phenyl rings [centroid-centroid distances = 3.704 (4) and 3.715 (4) Å] lead to a three-dimensional supra-molecular structure.

catena-Poly[[(4,4'-dimethyl-2,2'-bipyridine-κ(2) N,N')cadmium]-di-µ-bromido].

In the crystal of the title polymeric compound, [CdBr2(C12H12N2)] n , the Cd(II) cation is located on a twofold rotation axis and is six-coordinated in a distorted octa-hedral geometry formed by two N atoms from the 4,4'-dimethyl-2,2'-bipyridine ligand and by four bridging Br(-) anions. The bridging function of the Br(-) anions leads to a polymeric chain running along the c axis. Weak C-H⋯π inter-actions observed between adjacent chains are effective in the stabilization of the three-dimensional packing.