Self-assembly of a hybrid organic–inorganic dicopper(II) coordination polymer with a calix[4]arene-derived nitrogenous ligand

Reaction of bispicolyl-p-tert-butylcalix[4]arene (L1) functionalized in alternate phenolic positions with dimeric copper(II) acetate resulted in the formation of a hybrid organic–inorganic polymer. In the solid state, dicopper fragments are bridged by the bidentante ligand [Cu2(μ-O2CCH3)4(μ-L1) · C4H8O]n, with one molecule of tetrahydrofuran in the asymmetric unit. The two independent Cu(II) ions possess square pyramidal coordination geometries defined by the four acetate ligands, and a picolyl group in the axial position.