Chloro­(pyridine-4-carbonitrile-κN¹)(1,4,7-triaza­cyclo­nona­ne-κ³N,N′,N′′)copper(II) perchlorate

In the title compound, [CuCl(C₆H₄N₂)(C₆H₁₅N₃)]ClO₄, the central copper ion is coordinated by three N atoms from 1,4,7-triaza­cyclo­nonane, one N atom from the cyano­pyridine and one Cl atom, forming a square-pyramidal coordination geometry (τ = 0.31). The crystal packing is stabilized by inter­molecular N—H...O and N—H...Cl hydro­gen bonds.

The two-dimensional network polymer of (ethanol)(μ₃-N-salicyclideneglycinato)nickel(II)

In the title complex, [Ni(C₉H₇NO₃)(C₂H₆O)]_n, each Ni atom is octa­hedrally coordinated by four O atoms and one N atom from three fully deprotonated N-salicylideneglycinate (salgly) anions and by one O atom from an ethanol mol­ecule. Two inversion-related Ni²⁺ ions are bridged by two O atoms from the phenolate groups of two salgly anions, forming a centrosymmetric dimeric unit which is further linked by carboxyl­ate O atoms to give a two-dimensional network coordination polymer in the bc plane.

catena-Poly[[diaqua­(1,10-phenanthroline-κ²N,N′)cadmium(II)]-μ-fumarato-κ²O:O′]

In the title polymeric complex, [Cd(C₄H₂O₄)(C₁₂H₈N₂)(H₂O)₂]_n, the Cd^II ions are bridged by fumarate dianions to form zigzag complex chains. π–π stacking is observed between the parallel phenanthroline ligands of neighboring complex chains. The Cd ion is located on a twofold axis and has a distorted octa­hedral coordination geometry, while the fumarate dianion lies on an inversion center.