catena -Poly[oxidanium [tris{μ-[amino(iminio)methyl]phosphonato}zincate(II)]]

The crystal structure of the anionic zinc-[amino-(iminio)meth-yl]phospho-nate one-dimensional coordination polymer, Zn-AIMP, is reported; the negative charge is balanced by an oxidanium cation (H O ) to give the composition {(H O)[Zn(CH N PO ) ]} . The building unit of the coordination polymer comprises a divalent Zn cation (site symmetry ..) and three [amino(iminio)meth-yl]phospho-nate mono-anionic ligands (point group symmetry ). The AIMP ligand exists in a zwitterionic form with a total charge -1 as the phospho-nate is fully deprotonated (-PO ), while the amino-(iminio)methyl moiety is protonated (H N-C-NH ).