Bis(4-carb­oxy­pyridine-2-carboxyl­ato-κ2 N,O 2)copper(II) dimethyl sulfoxide disolvate

In the title complex, [Cu(C7H4NO4)2]·2C2H6OS, the CuII atom is situated on an inversion centre and is N,O-chelated by two monoanionic 4-carb­oxy­pyridine-2-carboxyl­ate ligands in a slightly distorted square-planar coordination geometry. The dimethyl sulfoxide solvent mol­ecules and CuII complex mol­ecules are linked by O—H⋯O hydrogen bonding. In addition, C—H⋯O contacts and π–π inter­actions [centroid–centroid distance = 3.590 (1) Å] occur

Bis(2-amino-4-methyl­pyridinium) bis­(pyridine-2,6-dicarboxyl­ato)cuprate(II)

The asymmetric unit of the title compound, (C6H9N2)2[Cu(C7H3NO4)2], contains half of a [Cu(pydc)2]2− (pydcH2 is pyridine-2,6-dicarb­oxy­lic acid) anion and one protonated 2-amino-4-methyl­pyridine (2a4mpH)+ counter-ion. The anion is a six-coordinated complex with a distorted CuN2O4 octa­hedral geometry around the CuII ion. N—H⋯O and C—H⋯O hydrogen bonds along with π–π contacts between the pyridine rings of the (2a4mpH)+ cations [centroid–centroid distance = 3.573 (2) Å] stabilize the crystal structure

Benzene-1,3-diammonium bis­(pyridine-2,6-dicarboxyl­ato)nickelate(II) penta­hydrate

In the title compound, (C6H10N2)[Ni(C7H3NO4)2]·5H2O, the NiII ion is six-coordinated by two N and four O atoms from two pyridine-2,6-dicarboxyl­ate ligands in a distorted octa­hedral fashion. The crystal packing is stabilized by inter­molecular O—H⋯O and N—H⋯O and weak C—H⋯O hydrogen bonds and π–π inter­actions [centroid–centroid distances = 3.4669 (19) and 3.764 (2) Å]

Bis{2-[(2,4-dimethyl­phen­yl)imino­meth­yl]pyridine-κ2 N,N′}bis­(thio­cyanato-κN)cadmium

The title compound, [Cd(NCS)2(C14H14N2)2], features crystallographic inversion symmetry with the CdII ion located on a centre of inversion. The CdII ion is six-coordinated in a slightly distorted octa­hedral geometry with the thiocyanate anions in axial positions. The angle between the benzene and pyridine rings is 69.64 (9)°. An inter­molecular C—H⋯S hydrogen bond stabilizes the crystal structure

2,2′-Azanediyl­diethanaminium pyridine-2,5-dicarboxyl­ate

The crystal structure of the title compound, C4H15N3 2+·C7H3NO4 2−, consists of diethyl­enetriaminium (2,2′-azanediyl­diethanaminium) cations and pyridine-2,5-dicarboxyl­ate anions, which are linked by N—H⋯O, N—H⋯N and C—H⋯O hydrogen bonds. C—H⋯π inter­actions are also observed. In the anion, the carboxyl­ate groups are oriented at dihedral angles of 11.04 (15) and 6.31 (14)° with respect to the pyridine ring

Dibromido(2,9-dimethyl-1,10-phenanthroline-κ2 N,N′)zinc

The reaction of equimolar amounts of zinc bromide and 2,9-dimethyl-1,10-phenanthroline in dry methanol provided the title compound, [ZnBr2(C14H12N2)], in good yield. The ZnII ion is coordinated in a distorted tetra­hedral environment by two N atoms from the chelating 2,9-dimethyl-1,10-phenanthroline ligand and two bromide ions. There is inter­molecular π–π stacking between adjacent phenanthroline units, with centroid–centroid distances of 3.594 (3) and 3.652 (3) Å

Poly[aqua­(dimethyl sulfoxide)(μ4-pyridine-2,5-dicarboxyl­ato)calcium(II)]

In the polymeric title compound, [Ca(C7H3NO4)(H2O)(C2H6OS)]n, the CaII ion is coordinated in a distorted penta­gonal–bipyramidal CdNO6 geometry. The crystal packing is stabilized by O—H⋯O hydrogen bonds and π–π stacking inter­actions between the aromatic rings of pyridine-2,5-dicarb­oxy­late with centroid–centroid distances of 3.6166 (13) Å

Dichlorido[2,4-dimethyl-N-(pyridin-2-yl­methyl­idene)aniline-κ2 N,N′]dimethyl­tin(IV)

The asymmetric unit of the title compound, [Sn(CH3)2Cl2(C14H14N2)], contains two crystallographically independent mol­ecules. In each mol­ecule, the SnIV atom is six-coordinated in a distorted octa­hedral geometry by one bidentate 2,4-di­methyl-N-(pyridin-2-yl­methyl­idene)aniline ligand, two methyl groups and two Cl atoms. In the crystal, inter­molecular C—H⋯Cl hydrogen bonds link the mol­ecules. There are π–π contacts between the pyridine rings of the ligands [centroid–centroid distance = 3.761 (4) Å]

Propane-1,2-diaminium bis­(pyridine-2,6-dicarboxyl­ato-κ3 O 2,N,O 6)cadmate dihydrate

The reaction of cadmium nitrate dihydrate, propane-1,2-diamine and pyridine-2,6-dicarb­oxy­lic acid in a 1:1:2 molar ratio in an aqueous solution resulted in the formation of the title compound, (C3H12N2)[Cd(C7H3NO4)2]·2H2O or (p-1,2-daH2)-[Cd(pydc)2]·2H2O (where p-1,2-da is propane-1,2-diamine and pydcH2 is pyridine-2,6-dicarb­oxy­lic acid). The CdII ion is coordinated by four O and two N atoms of two pydc ligands in a distorted octa­hedral environment. The structure also contains two uncoordinated water mol­ecules. In the crystal, there are several inter­molecular N—H⋯O, O—H⋯O and weak C—H⋯O hydrogen bonds. There are also π–π stacking inter­actions between the pyridine rings of pydc units, with centroid–centroid distances of 3.4708 (16) Å

{4,4′-Dibromo-2,2′-[2,2-dimethyl­propane-1,3-diylbis(nitrilo­methanylyl­idene)]diphenolato-κ4 O,N,N′,O′}nickel(II)

In the title compound, [Ni(C19H18Br2N2O2)], the NiII ion, lying on a twofold rotation axis, is coordinated by two N atoms and two O atoms from the Schiff base ligand in a distorted square-planar geometry. Weak inter­molecular C—H⋯O hydrogen bonds stabilize the crystal structure