![Sample our Physical Sciences journals, sign in here to start your FREE access for 14 days]({"type":"image" , "src" : "/sda/110819/TOC-Subject-Sample-2021-Physical-Sciences.jpg"})
Abstract
Two original acid derivatives of methylene diphosphonic acid (MDP) with two inequivalent phosphorus atoms have been synthesised: [(thiophosphonato)-methyl]phosphonic acid, (MDPS), and [(isopropyiamido phosphonato)-methyl] phosphonic acid, (MDPN). A poten- tiometric study allowed to define the stoechiometry of the complex formed between MDP and magnesium (II) in alcaline medium and a 31P NMR study proved the dissymetric structure of this MDPMg2+ complex. The displacement of the coordination equilibrium between Black Eriochrome T and magnesium (II) permitted to compare the coordination strength of MDP, MDPS and MDPN with the cation Mg2+.
