One-dimensional macrocyclic zinc(II) coordination polymer containing an unusual bis-monodentate oxalate bridge

A new zinc(II) complex, {[Zn(L1)(oxalate)] · 3.5H2O}n (1) (L = 5,16-dimethyl-2,6,13,17-tetraazatricyclo[16.4.01,18.07, 12]docosane) has been prepared and characterized by single crystal X-ray structure determination. In 1 the rigidity and steric hindrance of the macrocycle L1 causes the bridging oxalate ligand to coordinate to the zinc(II) ions in an unusual twisted bis-monodentate coordination (1,1′-bicoordination) mode.