Structure of tetrasodium nitrilotrimethylenetriphosphonatozincate tridecahydrate Na4[N(CH2PO3)3Zn] · 13H2O, an inhibitor of scaling and corrosion

The structure of a crystal hydrate of tetrasodium nitrilotrimethylenetriphosphonatozincate Na4[N(CH2PO3)3Zn] · 13H2O is determined (space group P 1 , Z = 2, a = 11.2208(2) Å, b = 11.2666(3) Å, c = 12.3286(3) Å, α = 108.455(2)°, β = 97.168(2)°, and = 117.103(2)°, Z = 2). The complex has a chelate structure; the inner coordination sphere includes three five-membered N-C-P-O-Zn cycles, which share the Zn-N bond. An oxygen atom of a neighboring complex completes a distorted trigonal bipyramidal coordination of the Zn atom.