Abstract

Reactions of Mg 2+ ( 1), Ca 2+ ( 2), Sr 2+ ( 3), or Ba 2+ ( 4) salts with hydroxyphosphonoacetic acid (HPAA) at a 1:1 ratio yield M-HPAA layered coordination polymers. The crystal structures of 3 (two phases) and 4 have been determined by single crystal X-ray crystallography. Both stereoisomers ( R and S) of HPAA are incorporated in the metal-HPAA materials. Synergistic combinations of Sr 2+ or Ba 2+ and HPAA at pH 7.3 are effective corrosion inhibitors for carbon steel, but are ineffective at pH 2.0.

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