Copper(II) perchlorate and (PhCONH)P(O)(OH)(2) (H(2)bpa) react in methanol to yield [Cu(Hbpa)(2)](n), a novel layered solid that displays several interesting features. Unlike the previously reported copper phosphonates, a rare hexacoordination around the metal is observed in the title compound because of the amide C=O coordination to Cu in addition to the phosphoramidate P-O coordination. The six-membered chelate rings present in the title compound are made up of five different elements (Cu, P, C, N, and O).