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

The crystal structure of the anionic zinc–[amino­(iminio)meth­yl]phospho­nate one-dimensional coordination polymer, Zn-AIMP, is reported; the negative charge is balanced by an oxidanium cation (H(3)O(+)) to give the composition {(H(3)O)[Zn(CH(4)N(2)PO(3))(3)]}( n ). The building unit of the coordination polymer comprises a divalent Zn(2+) cation (site symmetry [Image: see text] ..) and three [amino(iminio)meth­yl]phospho­nate mono-anionic ligands (point group symmetry m). The AIMP ligand exists in a zwitterionic form with a total charge −1 as the phospho­nate is fully deprotonated (–PO(3) (2−)), while the amino­(iminio)methyl moiety is protonated (H(2)N—C—NH(2) (+)). [Image: see text]