Also Called: Nickelate(4-), [[[nitrilotris(methylene)]tris[phosphonato]](6-)-N,OP,OP',OP'']-, triammonium hydrogen, (T-4)-;Nickelate(4-), [[P,P'-[(nitrilo-.kappa.N)tris(methylene)]tris[phosphonato-.kappa.O]](6-)]-, ammonium hydrogen (1:3:1), (T-4)-;Nickelate(4-), [[[nitrilotris(methylene)]tris[phosphonato]](6-)-N,OP,OP',OP'']-, triammonium hydrogen, (ß-4)-;Nickel compounds;Triammonium hydrogen [[[nitrilotris(methylene)]tris[phosphonato]](6-)]nickelate(4-)