catena-Poly[[diiodidomercury(II)]-μ₂-2-amino­pyrazine-κ²N¹:N⁴]

In the crystal of the title polymeric compound, [HgI₂(C₄H₅N₃)]_n, the Hg^II cation is located on a twofold rotation axis and is coordinated by two I⁻ anions and two 2-amino­pyrazine ligands in a distorted HgI₂N₂ tetra­hedral geometry. In the crystal, the 2-amino­pyrazine 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 inter­molecular N—H...I hydrogen bonds.

catena-Poly[[bis­(pyridine-3-carb­oxy­lic acid-κN)mercury(II)]-di-μ-chlorido]

In the title compound, [HgCl₂(C₆H₅NO₂)₂]_n, the Hg^II cation is located on an inversion center and is six-coordinated in a distorted octa­hedral geometry by two N atoms from two pyridine-3-carb­oxy­lic acid mol­ecules 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-κN⁴)zinc

The title complex, [ZnBr₂(C₅H₅N₃O)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 tetra­hedral 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 inter­actions.

Dichloridobis(pyrazine-2-carboxamide-κN⁴)zinc(II)

In the crystal of the title compound, [ZnCl₂(C₅H₅N₃O)₂], the mol­ecule 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 ZnCl₂N₂ tetra­hedral geometry. The two pyrazine rings are nearly perpendicular to each other [dihedral angle = 86.61 (10)°]. Inter­molecular N—H...O and N—H...N hydrogen bonds and weak C—H...O inter­actions stabilize the crystal packing.

catena-Poly[[[aqua­(pyrazine-2-carboxamide-κ²N¹,O)zinc]-μ-pyrazine-2-carboxamide-κ³N¹,O:N⁴] dinitrate]

In the crystal of the title compound, {[Zn(C₅H₅N₃O)₂(H₂O)](NO₃)₂}_n, the Zn^II cation is N,O-chelated by two pyrazine-2-carboxamide (PCA) ligands and is further coordinated by one water mol­ecule and by one pyrazine-N atom from an adjacent PCA ligand in a distorted ZnN₃O₃ octa­hedral 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 NO₃⁻ anions link to the chain via O—H...O and N—H...O hydrogen bonding. Weak inter­molecular C—H...O inter­actions also occur.

catena-Poly[[(2-amino­pyrimidine-κN¹)(thio­cyanato-κS)mercury(II)]-μ-thio­cyanato-κ²S:N]

In the title coordination polymer, [Hg(NCS)₂(C₄H₅N₃)], the Hg^II atom is four-coordinated by one aromatic N atom from a 2-amino­pyrimidine ligand, one S atom from a terminal thio­cyanate ligand, and one S atom and one N atom from a bridging thio­cyanate ligand. The crystal structure features polymeric chains running along the b axis which are stabilized by N—H...N hydrogen bonds.

catena-Poly[[(5,5′-dimethyl-2,2′-bipyridine-κ²N,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. The Cd^II cation is six-coordinated in a distorted octa­hedral 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.

Dibromido(4,4′-dimethyl-2,2′-bipyridine-κ²N,N′)(dimethyl sulfoxide-κO)cadmium

In the title compound, [CdBr₂(C₁₂H₁₂N₂)(C₂H₆OS)], 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 intra­molecular 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.

Diaqua­bis­(nitrato-κ²O,O′)bis­(pyrazine-2-carboxamide-κN⁴)cadmium–pyrazine-2-carboxamide (1/2)

In the title compound, [Cd(NO₃)₂(C₅H₅N₃O)₂(H₂O)₂]·2C₅H₅N₃O, the Cd^II cation is located on a twofold rotation axis and is coordinated by two pyrazine-2-carboxamide ligands and two water mol­ecules and chelated by two nitrate anions in a distorted square-anti­prismatic geometry. Extensive inter­molecular N—H...O, N—H...N, O—H...O and O—H...N hydrogen bonds, as well as weak inter­molecular C—H...N and C—H...O inter­actions 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.

Bis(acetato-κO)bis­(2-pyridine­aldoxime-κ²N,N′)cadmium

In the title mol­ecule, [Cd(CH₃COO)₂(C₆H₆N₂O)₂], the Cd^II cation is N,N′-chelated by two 2-pyridine­aldoxime ligands and coordinated by two acetate anions in a distorted octa­hedral geometry. The hy­droxy groups of the 2-pyridine­aldoxime ligands link to the acetate anions via intra­molecular O—H...O hydrogen bonds. Weak inter­molecular C—H...O hydrogen bonds occur in the crystal.

catena-Poly[[tetra­aqua­copper(II)]-μ-pyrazine-2-carboxamide-κ³N⁴:N¹,O-[bis­(sulfato-κO)copper(II)]-μ-pyrazine-2-carboxamide-κ³N¹,O:N⁴]

In the crystal of the title polymeric compound, [Cu₂(SO₄)₂(C₅H₅N₃O)₂(H₂O)₄]_n, two independent Cu^II atoms are located on individual inversion centers. One Cu^II atom is coordinated by four water mol­ecules and two pyrazine-2-carboxamide ligands in a distorted O₄N₂ octa­hedral geometry; the other is N,O-chelated by two pyrazine-2-carboxamide ligands and further coordinated by two sulfate anions in a distorted O₄N₂ octa­hedral 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-κ²N,N′)cadmium

In the title compound, [CdBr₂(C₁₁H₁₀N₂)(C₂H₆OS)], 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 intra­molecular 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(6,6′-dimethyl-2,2′-bipyridine-κ²N,N′)cadmium

In the title compound, [CdBr₂(C₁₂H₁₂N₂)], the Cd^II atom is four-coordinated in a distorted tetra­hedral 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 inter­actions between the pyridine rings [centroid–centroid distance = 3.763 (5) Å] are present.

Trichlorido(4,4′-dimethyl-2,2′-bipyridine-κ²N,N′)(methanol-κO)indium(III) methanol monosolvate

In the title compound, [InCl₃(C₁₂H₁₂N₂)(CH₃OH)]·CH₃OH, the In^III atom is six-coordinated in a distorted octa­hedral geometry by two N atoms from a chelating 4,4′-dimethyl-2,2′-bipyridine ligand, one O atom from a methanol mol­ecule and three Cl atoms. In the crystal, inter­molecular O—H...O and O—H...Cl hydrogen bonds link the complex and solvent methanol mol­ecules. Intra­molecular C—H...Cl hydrogen bonds are also present in the complex.

Trichlorido(dimethyl sulfoxide-κO)(di-2-pyridyl­amine-κ²N,N′)indium(III)

In the title compound, [InCl₃(C₁₀H₉N₃)(C₂H₆OS)], the In^III atom is six-coordinated in a distorted octa­hedral geometry by two N atoms from a chelating di-2-pyridyl­amine ligand, one O atom from a dimethyl sulfoxide ligand and three Cl atoms. Inter­molecular 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-κ²N,N′)oxidovanadium(IV) chloride ethanol monosolvate monohydrate

In the title compound, [VClO(C₁₂H₁₂N₂)₂]Cl·C₂H₅OH·H₂O, the V^IV atom is six-coordinated in a distorted octa­hedral 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. Intra­molecular C—H...O and C—H...Cl hydrogen bonds are also present.

Trichlorido(6-methyl-2,2′-bipyridine-κ²N,N′)(dimethyl­sulfoxide-κO)indium(III)

In the title compound, [In(C₁₁H₁₀N₂)Cl₃(C₂H₆OS)], the In^III cation is six-coordinated in a distorted octa­hedral configuration by two N atoms from the chelating 6-methyl-2,2′-bipyridine ligand, one O atom from a dimethyl­sulfoxide group and three Cl⁻ anions. Weak inter­molecular C—H...O and C—H...Cl hydrogen bonds and intra­molecular C—H...Cl hydrogen bonds are present in the structure.

Dibromido(6,6′-dimethyl-2,2′-bipyridine-κ²N,N′)cobalt(II)

In the title compound, [CoBr₂(C₁₂H₁₂N₂)], the Co^II atom is four-coordinated in a distorted tetra­hedral geometry by two N atoms from a 6,6′-dimethyl-2,2′-bipyridine ligand and by two terminal Br atoms. Inter­molecular C—H...Br hydrogen bonds and π–π stacking between the pyridine rings in the bc plane [centroid–centroid distance = 3.725 (3) Å] are present in the crystal structure.

Dibromido(2,9-dimethyl-1,10-phenanthroline-κ²N,N′)cobalt(II) acetonitrile monosolvate

In the title compound, [CoBr₂(C₁₄H₁₂N₂)]·CH₃CN, the Co^II atom is four-coordinated in a distorted tetra­hedral geometry by two N atoms from a chelating 2,9-dimethyl-1,10-phenanthroline ligand and two terminal Br atoms. In the crystal, π–π contacts between the pyridine and benzene rings [centroid–centroid distances = 3.828 (5), 3.782 (5), 3.880 (5) and 3.646 (5) Å] stabilize the structure.

Trichlorido(5,5′-dimethyl-2,2′-bipyridine-κ²N,N′)(dimethyl­formamide-κO)indium(III) hemihydrate

The asymmetric unit of the title compound, [InCl₃(C₁₂H₁₂N₂)(C₃H₇NO)]·0.5H₂O, contains two independent In^III complex mol­ecules with similar structures and one lattice water mol­ecule. In each complex mol­ecule, the In^III atom is six-coordinated in a distorted octa­hedral geometry, formed by two N atoms from the chelating 5,5′-dimethyl-2,2′-bipyridine ligand, one O atom from a dimethyl­formamide and three facial Cl atoms. In the crystal, the lattice water mol­ecule is linked to the complex mol­ecules 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-κ²N,N′)cobalt(II)

In the mol­ecule of the title compound, [CoBr₂(C₁₁H₁₀N₂)], the Co^II atom is four-coordinated in a distorted tetra­hedral 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 inter­actions 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-κ²N,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 supra­molecular structure.

catena-Poly[[(4,4′-dimethyl-2,2′-bipyridine-κ²N,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 octa­hedral 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 inter­actions observed between adjacent chains are effective in the stabilization of the three-dimensional packing.

(4,4′-Dimethyl-2,2′-bipyridine-κ²N,N′)(dimethyl­formamide-κO)diiodido­cadmium

In the title compound, [CdI₂(C₁₂H₁₂N₂)(C₃H₇NO)], the Cd^II cation is five-coordinated in a distorted trigonal–bipyramidal configuration by two N atoms from a 4,4′-dimethyl-2,2′-bipyridine ligand, one O atom from a dimethyl­formamide ligand and two I⁻ anions. π–π stacking between pyridine rings of adjacent mol­ecules [centroid–centroid distance = 3.666 (3) and 3.709 (4) Å] stabilizes the three-dimensional structure