Synthesis and complexation properties of a new tetraazatricarboxylate ligand

Carlos F G C Geraldes, Erno Brücher, Sergio Cortes, Seymour H. Koenig, A. Dean Sherry

Research output: Contribution to journalArticle

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Abstract

A non-cyclic tetraazatricarboxylate ligand, tris(4-carboxy-3-methyl-3-azabutyl)amine (H3L), derived from tris(2-aminoethyl)amine, was synthesised and purified. Its macroscopic and microscopic protonation behaviour was studied using potentiometry and proton NMR titrations, respectively. Stability constants for its complexes with Ni2+, Cu2+, Zn2+, Cd2+ and Gd3+ were obtained potentiometrically and compared with those of related ligands. The structure, protonation and dynamics of the complexes of H3L with Zn2+ and La3+ were investigated by proton NMR spectroscopy as a function of pH and the results were in accord with the potentiometric data for the complexes of Zn2+ and Gd3+. A nuclear magnetic relaxation dispersion study compared the water-proton relaxation parameters of [GdL] and [Gd(dtpa)]2- (H5dtpa = N,N,N′,N″,N″-diethylenetriaminepentaacetic acid), concluding that their water co-ordination numbers are the same but the former complex has a shorter electron-spin relaxation time.

Original languageEnglish (US)
Pages (from-to)2517-2521
Number of pages5
JournalJournal of the Chemical Society, Dalton Transactions
Issue number16
DOIs
StatePublished - 1992

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Complexation
Protons
Protonation
Ligands
Magnetic relaxation
Water
Titration
Relaxation time
Nuclear magnetic resonance spectroscopy
Amines
Nuclear magnetic resonance
Acids
Electrons

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

Synthesis and complexation properties of a new tetraazatricarboxylate ligand. / Geraldes, Carlos F G C; Brücher, Erno; Cortes, Sergio; Koenig, Seymour H.; Sherry, A. Dean.

In: Journal of the Chemical Society, Dalton Transactions, No. 16, 1992, p. 2517-2521.

Research output: Contribution to journalArticle

Geraldes, Carlos F G C ; Brücher, Erno ; Cortes, Sergio ; Koenig, Seymour H. ; Sherry, A. Dean. / Synthesis and complexation properties of a new tetraazatricarboxylate ligand. In: Journal of the Chemical Society, Dalton Transactions. 1992 ; No. 16. pp. 2517-2521.
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