Nitrilotri(methylenephosphonic acid) N-oxide and nitrilotriacetic acid N-oxide: Acidity and complexing of calcium and magnesium ions

Article abstract of DOI:10.1021/ic50051a019

The synthesis and aqueous stability of nitrilotri(methylenephosphonic acid) N-oxide are reported. Its acidity constants and calcium and magnesium stability constants are reported in addition to those for nitrilotriacetic acid N-oxide. Available information, including ¹H and ³¹P nmr measurements as a function of the number of bound protons, indicates these ligands exist as dipolar ions in solution.