Reactions of diiron(III) tris[(1-hydroxyethylidene)diphosphonate] tetrahydrate and iron(III) tris[(1-hydroxyethylidene)diphosphonate] tetrahydrate with p-aminobenzoic acid. Molecular structure of bis(4-carboxyphenylaminium) (1-hydroxyethylidene)diphosphonate

Abstract

Diiron(III) tris[(1-hydroxyethylidene)diphosphonate] tetrahydrate and iron(III) tris[(1-hydroxyethylidene) diphosphonate] tetrahydrate react with p-aminobenzoic acid in water to form diiron(III) pentakis(4-carboxyphenylaminium) tris(1-hydroxyethylidene)diphosphonate dihydrate and iron(III) hexakis(4-carboxyphenylaminium) tris(1-hydroxyethylidene)diphosphonate dihydrate. The crystal structure of bis(4-carboxyphenylaminium) (1-hydroxyethylidene)diphosphonate obtained by the reaction of (1-hydroxyethylidene)diphosphonic acid with p-aminobenzoic acid in methanol was established.