A twofold inter­woven two-dimensional[rightwards arrow]two-dimen­sional (2-D[rightwards arrow]2-D) cluster-organic network based on the [Cu₂I₂] cluster and the 4,4'-(diazene­di­yl)dipyridine ligand: poly[[[mu]₂-4,4'-(diazenedi­yl)dipyridine]-[mu]₂-iodido-copper(I)]

In the polymeric title compound, [CuI(C₁₀H₈N₄)]_n, the Cu^I atom is in a four-coordinated tetra­hedral geometry, formed by two I atoms and two pyridine N atoms from two different 4,4'-(diazenedi­yl)dipyridine (4,4'-azpy) ligands. Two [mu]₂-I atoms link two Cu^I atoms to form a planar rhomboid [Cu₂I₂] cluster located on an inversion centre, where the distance between two Cu^I atoms is 2.7781 (15) Å and the Cu-I bond lengths are 2.6290 (13) and 2.7495 (15) Å. The bridging 4,4'-azpy ligands connect the [Cu₂I₂] clusters into a two-dimensional (2-D) double-layered grid-like network [parallel to the (10) plane], with a (4,4)-connected topology. Two 2-D grid-like networks inter­weave each other by long 4,4'-azpy bridging ligands to form a dense 2-D double-layered network. To the best of our knowledge, this inter­woven 2-D[rightwards arrow]2-D network is observed for the first time in [Cu₂I₂]-organic compounds.

Electrochemical properties of a cobalt(II) complex with sulfadiazine and 1,3-bis­(pyridin-4-yl)propane

A one-dimensional polymeric structure of Co^II with sulfadiazine and 1,3-bis­(pyridin-4-yl)propane is further stabilized by inter­molecular hydrogen bonding. The structure is of inter­est with respect to its electrochemical properties in the reduction reaction of H₂O₂ to H₂O. Investigation of the thermal stability shows that the complex is stable up to 543 K.

Synthesis, crystal structure and fluorescence spectrum of a cadmium(II) sulfaquinoxaline complex

A one-dimensional polymeric structure of Cd^II with sulfaquinoxaline is further stabilized by inter­molecular hydrogen bonding. The fluorescence spectrum reveals that the complex emits strong blue fluorescence. The thermal analysis shows that the framework is stable up to 663 K.