Structure of complexes of nitrilo tris methylene phosphonic acid with copper, [CuN(CH2PO3)3(H2O)3] and Na4[CuN(CH2PO3)3]2 · 19H2O, as bactericides and inhibitors of scaling and corrosion

Nitrilotris methylene phosphonate triaqua copper and octasodium bis(nitrilotris methylene phosphonate cuprate(II)) nonadecahydrate have been synthesized and investigated. [CuN(CH2PO3)3(H2O)3] is crystallized in the sp. gr. P21/c, Z = 4, a = 9.2506(2) Å, b = 15.9815(2) Å, c = 9.5474(2) Å, β = 113.697(2)°. The copper atom is coordinated by oxygen atoms in the configuration of elongated octahedron; the ligand (of bridge type) links neighboring copper atoms. Na8[CuN(CH2PO3)3]2 · 19H2O is crystallized in the sp. gr. P21/c, Z = 2, a = 11.24550(10) Å, b = 17.38980(10) Å, c = 13.5852(2) Å, β = 127.8120(10)°. This complex is chelating; the copper atom closes three five-membered N-C-P-O-Cu cycles with a shared Cu-N bond. Copper is coordinated in a distorted trigonal-bipyramidal configuration.