Anion...[pi] inter­actions in copper(I) chloride and bromide coordination polymers bearing 1,4-bis(pyridazin-4-yl)benzene ligands

The title chloride and bromide coordination polymers are isomorphous and the primary coordination motif consists of cuprohalogenide chains accommodating [mu]-pyridazine groups. The organic ligands are tetra­dentate and link the inorganic chains into corrugated layers. The packing is influenced by inter­layer anion...[pi] inter­actions.

Cobalt(II) chloride complexes with 1,1'-dimethyl-4,4'-bi­pyrazole featuring first- and second-sphere coordination of the ligand

The first cobalt(II) complexes involving N,N'-disubstituted 4,4'-bi­pyrazole tectons reveal the relatively poor coordination ability of the ligand, resulting in a Co-pyrazole coordination ratio of only 1:2.