A hybrid open-framework iron phosphate-oxalate with a large unidimensionalchannel, showing reversible hydration

A novel inorganic-organic hybrid iron phosphate-oxalate material has been s ynthesized hydrothermally in the presence of ethylenediamine as the structu re-directing agent. The three-dimensional solid possesses neutral iron phos phate layers built up by strictly alternating FeO6 octahedra and PO4 tetrah edra creating large voids of similar to 5 Angstrom free diameter bound by 1 2 T atoms (T = Fe, P). The oxalate units act as pillars holding the layers apart, and together. The positions of the oxalate units and the amine are s uch as to give rise to a large one-dimensional channel. The solid orders an tiferromagnetically with a Neel temperature of 31 K. The solid undergoes re versible dehydration and shows adsorptive properties.