Complexes of aminophosphonates. Part 7. Copper(II) complexes of some aliphatic, alicyclic and aromatic aminophosphonous and aminophosphinic acids
- 1 January 1991
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc., Dalton Trans.
- No. 9,p. 2275-2279
- https://doi.org/10.1039/dt9910002275
Abstract
PH-Metric and spectroscopic (visible and ESR) studies were made of the proton and copper(II) complexes of various bidentate aliphatic, alicyclic and aromatic aminophosphonous and amino-phosphinic acids, and of the α- and β-phosphinic acid derivatives of aspartic acid, at 25 °C and at an ionic strength of 0.20 mol dm–3(KCl). It was found that the metal-binding abilities of these bidentate ligands are weaker than those of their aminocarboxylate analogues, which is due mainly to the differences in basicity of the PO2R– and the CO2 – groups. The potentially terdentate aspartic acid derivatives are co-ordinated mainly via their aminocarboxylate moieties and the participation of the phosphinate group in the co-ordination is significant only for the α-phosphinic acid derivative. The metal-binding abilities of amino-phosphonates, -phosphinates and -carboxylates are compared.Keywords
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