One-dimensional copper(II) coordination polymers based on 1,3-bis(pyridin-4-yl)propane and diimine ligands

Abstract

Two one-dimensional (1D) coordination polymers (CPs), namely catena-poly[[[aqua(2,2′-bipyridine-κ2 N,N′)(nitrato-κO)copper(II)]-μ-1,3-bis(pyridin-4-yl)propane-κ2 N:N′] nitrate], {[Cu(NO3)(C10H8N2)(C13H14N2)(H2O)]·NO3} n (1), and catena-poly[[[aqua(nitrato-κO)(1,10-phenanthroline-κ2 N,N′)copper(II)]-μ-1,3-bis(pyridin-4-yl)propane-κ2 N:N′] nitrate], {[Cu(NO3)(C12H8N2)(C13H14N2)(H2O)]·NO3} n (2), have been synthesized using [Cu(NO3)(NN)(H2O)2]NO3, where NN = 2,2′-bipyridine (bpy) or 1,10-phenanthroline (phen), as a linker in a 1:1 molar ratio. The CPs were characterized by elemental analysis, IR spectroscopy, thermogravimetric analysis and single-crystal X-ray structure determination. The 1,3-bis(pyridin-4-yl)propane (dpp) ligand acts as a bridging ligand, leading to the formation of a 1D polymer. The octahedral coordination sphere around copper consists of two N atoms from bpy for 1 or phen for 2, two N atoms from dpp, one O atom from water and one O atom from a coordinated nitrate anion. Each structure contains two crystallographically independent chains in the asymmetric unit and the chains are linked via hydrogen bonds into a three-dimensional network.