Complexes of aminophosphonates. Part 6. Copper(II) complexes of some catecholaminophosphonic acids

J. Balla, T. Kiss, M. Jezowska-Bojczuk, H. Kozlowski, P. Kafarski

Research output: Contribution to journalArticle

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Abstract

The stoicheiometries and stability constants of the proton and copper(II) complexes of L-1-amino-2-(3′,4′-dihydroxyphenyl) ethylphosphonic acid (L- adep), 1-amino-1-(3′,4′-dihydroxyphenyl)methylphosphonic acid (3,4-admp), and 1-amino-1-(2′,3′-dihydroxyphenyl)methylphosphonic acid (2,3-admp) have been determined pH-metrically at 25°C and at an ionic strength of 0.2 mol dm-3 (KCl). From the stability data and the spectral (visible and e.s.r.) parameters of the complexes, it has been established that similarly to the aminocarboxylate analogues the ligands show marked ambidentate character. At lower pH aminophosphonate-type complexes while at higher pH catecholate-type complexes are formed. In the intermediate pH range various monomeric and dimeric species with the participation of all binding sites are produced. In the case of 2,3-admp, where the chelate-forming donor-group pairs are not fully separated from each other, the tendency to dimer formation is more favoured.

Original languageEnglish
Pages (from-to)1861-1866
Number of pages6
JournalJournal of the Chemical Society, Dalton Transactions
Issue number6
DOIs
Publication statusPublished - 1990

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Copper
Acids
Ionic strength
Dimers
Protons
Binding Sites
Ligands
methylphosphonic acid
1-amino-1-(3,4-dihydroxyphenyl)methylphosphonic acid

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

Complexes of aminophosphonates. Part 6. Copper(II) complexes of some catecholaminophosphonic acids. / Balla, J.; Kiss, T.; Jezowska-Bojczuk, M.; Kozlowski, H.; Kafarski, P.

In: Journal of the Chemical Society, Dalton Transactions, No. 6, 1990, p. 1861-1866.

Research output: Contribution to journalArticle

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AU - Kiss, T.

AU - Jezowska-Bojczuk, M.

AU - Kozlowski, H.

AU - Kafarski, P.

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AB - The stoicheiometries and stability constants of the proton and copper(II) complexes of L-1-amino-2-(3′,4′-dihydroxyphenyl) ethylphosphonic acid (L- adep), 1-amino-1-(3′,4′-dihydroxyphenyl)methylphosphonic acid (3,4-admp), and 1-amino-1-(2′,3′-dihydroxyphenyl)methylphosphonic acid (2,3-admp) have been determined pH-metrically at 25°C and at an ionic strength of 0.2 mol dm-3 (KCl). From the stability data and the spectral (visible and e.s.r.) parameters of the complexes, it has been established that similarly to the aminocarboxylate analogues the ligands show marked ambidentate character. At lower pH aminophosphonate-type complexes while at higher pH catecholate-type complexes are formed. In the intermediate pH range various monomeric and dimeric species with the participation of all binding sites are produced. In the case of 2,3-admp, where the chelate-forming donor-group pairs are not fully separated from each other, the tendency to dimer formation is more favoured.

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