Peculiarities of manganese(II) interaction with hydroxyethylidene diphosphonic acid and aminomethylated calix[4]resorcinol in organized media

Abstract

The hydration state of the first coordination sphere of manganese complexes with hydroxyethylidene diphosphonic acid (HEDP, H4L) as well as for Mn(II) systems with salt compositions of aminomethylated calix[4]resorcinol (AMC) of different lipophilicity in micellar solutions, was evaluated by the nuclear magnetic relaxation method using manganese(II) as a paramagnetic probe. In acidic (pH 2–4) solutions of the Mn(II) –HEDP – AMC system for AMC with pentyl radicals, a bell-like rise in the relaxation efficiency values (up to 2 times) was observed. In the remaining pH areas and with a low ligand content, the calix[4]resorcinol do not affect the relaxation efficiency of Mn (II) complexes with HEDP.

Keywords

• manganese(ii)
• hydroxyethylidene diphosphonic acid
• aminomethylated calix[4]resor­cinol
• complexation
• nmr relaxation