A second monoclinic polymorph of di-μ-chlorido-bis­(chlorido{2-[(4-ethyl­phen­yl)imino­meth­yl]pyridine-κ²N,N′}copper(II))

The title compound, [Cu₂Cl₄(C₁₄H₁₄N₂)₂], is a new polymorph of a previously reported compound [Dehghanpour et al. (2011). Acta Cryst. E67, m1296]. The current polymorph was obtained from an acetonitrile solution of the title compound. Like the first polymorph, it is monoclinic (space group P2₁/c). The unique Cu^II ion in the title centrosymmetric dinuclear complex is in a distorted trigonal–bipyramidal coordination environment formed by the bis-­chelating N-heterocyclic ligand, two bridging Cl ligands and one terminal Cl ligand. In the crystal, weak C—H...Cl hydrogen bonds are observed in addition to π–π stacking inter­actions, with a centroid–centroid distance of 3.6597 (18) Å.

Diiodido{2-[(4-meth­oxy­phen­yl)imino­meth­yl]pyridine-κ²N,N′}zinc

In the title complex, [ZnI₂(C₁₃H₁₂N₂O)], the Zn^II atom has a distorted tetra­hedral coordination. The organic ligand is bidentate, coordinating the Zn^II atom via the two N atoms. The benzene and pyridine rings are oriented at a dihedral angle of 11.67 (9)°. In the crystal, weak C—H...I and C—H...O hydrogen bonds are observed, in addition to π–π stacking inter­actions, with a centroid–centroid distance of 3.72 (5) Å.

Dibromido{2-[(4-fluoro­phen­yl)imino­meth­yl]pyridine-κ²N,N′}zinc

In the title complex, [ZnBr₂(C₁₂H₉FN₂)], the Zn^II atom has a distorted tetra­hedral Br₂N₂ coordination sphere. The organic ligand is bidentate, coordinating the Zn^II atom via two imine N atoms. The benzene and pyridine rings are oriented at a dihedral angle of 10.49 (1)°. In the crystal, weak C—H...F and C—H...Br hydrogen bonds are observed.

catena-Poly[[dichloridomercury(II)]-μ-{N-[(E)-pyridin-2-yl­methyl­idene-κN]pyridin-3-amine-κ²N¹:N³}]

In the title coordination polymer, [HgCl₂(C₁₁H₉N₃)]_n, the Hg^II ion is coordinated by three N atoms from two N-[(E)-pyridin-2-yl­methyl­idene]pyridin-3-amine (L) ligands and two chloride anions in a distorted trigonal–bipyramidal geometry. The two pyridine rings in L form a dihedral angle of 50.0 (2)°. L ligands bridge adjacent HgCl₂ units into polymeric chains propagating in [010]. The crystal packing is further stabilized by weak inter­molecular C—H...Cl hydrogen bonds and π–π inter­actions between the pyridine rings, with a centroid–centroid separation of 3.529 (9) Å.

catena-Poly[[[iodidocopper(I)]-{μ-N-[(pyridin-2-yl-κN)methyl­idene]pyridin-3-amine-κ²N³:N¹}] acetonitrile hemisolvate]

In the asymmetric unit of the title polymeric complex, {[CuI(C₁₁H₉N₃)]·0.5CH₃CN}_n, there are two Cu^I atoms, two N-[(pyridin-2-yl-κN)methyl­idene]pyridin-3-amine (PyPy) ligands and two I atoms. Both Cu^I atoms have a distorted tetra­hedral geometry, each being coordinated by one I atom, two N atoms of one PyPy ligand and one N atom from an adjacent PyPy ligand. In the crystal, infinite helical chains of [Cu₂(PyPy)₂]_n are formed propagating along the b axis. These chains are linked via weak C—H...I hydrogen bonds and π–π stacking inter­actions [shortest centroid–centroid distance = 3.2727 (14) Å]. During the refinement, electron-density peaks were located that were believed to be highly disordered solvent mol­ecules (possibly acetonitrile). The SQUEEZE option in PLATON [Spek (2009). Acta Cryst. D65, 148–155] indicated there were solvent cavities with a total volume of 196 ų containing approximately 60 electrons per unit cell, which equated to one mol­ecule of acetonitrile per asymmetric unit.