catena-Poly[[[aqua­(pyrazine-2-carboxamide-κ2 N 1,O)zinc]-μ-pyrazine-2-carboxamide-κ3 N 1,O:N 4] dinitrate]

In the crystal of the title compound, {[Zn(C5H5N3O)2(H2O)](NO3)2}n, the ZnII 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 ZnII 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[[bis­(pyridine-3-carb­oxy­lic acid-κN)mercury(II)]-di-μ-chlorido]

In the title compound, [HgCl2(C6H5NO2)2]n, the HgII 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

catena-Poly[[diiodidomercury(II)]-μ2-2-amino­pyrazine-κ2 N 1:N 4]

In the crystal of the title polymeric compound, [HgI2(C4H5N3)]n, the HgII 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 HgII 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

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

In the crystal of the title compound, [ZnCl2(C5H5N3O)2], the mol­ecule has m symmetry, with the ZnII cation and Cl− anions located on the mirror plane. The ZnII 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

Dibromidobis(pyrazine-2-carboxamide-κN 4)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

Aqua­(4,4′-dimethyl-2,2′-bipyridine-κ2 N,N′)(nitrato-κO)(nitrato-κ2 O,O′)zinc

In the title compound, [Zn(NO3)2(C12H12N2)(H2O)], the ZnII atom is six-coordinated in a distorted octa­hedral geometry by two N atoms from a chelating 4,4′-dimethyl-2,2′-bipyridine ligand, one water O atom, one O atom from a monodentate nitrate anion and two O atoms from a chelating nitrate anion. In the crystal, there are aromatic π–π contacts between the pyridine rings [centroid–centroid distances = 3.9577 (13) Å] and inter­molecular O—H⋯O and C—H⋯O hydrogen bonds

catena-Poly[[(2-amino­pyrimidine-κN 1)(thio­cyanato-κS)mercury(II)]-μ-thio­cyanato-κ2 S:N]

In the title coordination polymer, [Hg(NCS)2(C4H5N3)], the HgII 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

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

In the title molecule, [Cd(CH3COO)2(C6H6N2O)2], the CdII 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

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

In the title compound, [InCl3(C12H12N2)(CH3OH)]·CH3OH, the InIII 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