OXAMATE AND CHLORANILATE BRIDGES IN POLYMERIC NETWORKS

Oxamic acid acts as a bridging ligand with lanthanide ions to form, fo r example 9-coordinate Ho(III) systems in which the holmium centres ar e linked into sheets via H-bonds. Nd(III) also forms 9-coordinate comp lexes with oxamate but an alternative packing motif is observed. Multi dentate ligands such as chloroanilate can also induce interesting netw orks. Thus with sodium and phenanthroline a complex which contains 7-c oordinate sodium atoms linked together to form infinite double chains is observed.