Influence of the steric effects of the Schiff bases and the hydrogen bonds on the bridging modes of the azide groups: Syntheses and crystal structures of three azide-bridged Schiff base zinc(II) complexe

Three polymeric zinc(II) complexes, derived from the end-on azide (μ1,1-N3) and end-to-end azide (μ1,3-N3) bridges and similar tridentate Schiff base ligands, have been synthesized and structurally characterized. The zinc(II) atom in each complex is in a midway between trigonal–bipyramidal and square–pyramidal coordination. The slight difference of the steric effects of the Schiff bases and the hydrogen bonds can influence the bridging modes of the azide groups.