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Issue 10, 2018
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The time-resolved fluorescence study of kinetics and thermodynamics of Eu(III) and Tb(III) complexes with the DO2A macrocyclic ligand

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Abstract

The thermodynamics of the interaction of the H2DO2A (= 1,4,7,10-tetraazacyclododecane-1,7-diacetic acid) macrocyclic ligand with both Eu(III) and Tb(III) ions was studied by means of luminescence spectroscopy in steady-state and time-resolved modes. It was shown that it is possible to calculate stability constants for both complexes that agree with values determined by other experimental techniques. The study of the formation and dissociation of both Ln(III) complexes shows that there is no significant difference in their reactivity if they contain three (Eu) or two (Tb) water molecules in their coordination shell. The two species of ligands present in the formation reaction, HL and L2−, differ in their reactivity, which can be explained by the difference in charge and the presence of a proton in the macrocyclic cavity. A detailed study of the dissociation reaction proved that the reaction mechanism consists of several pathways of intermediates, which differ in their structure and rate of decomposition.

Graphical abstract: The time-resolved fluorescence study of kinetics and thermodynamics of Eu(iii) and Tb(iii) complexes with the DO2A macrocyclic ligand

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Publication details

The article was received on 15 Jan 2018, accepted on 28 Feb 2018 and first published on 01 Mar 2018


Article type: Paper
DOI: 10.1039/C8NJ00255J
Citation: New J. Chem., 2018,42, 7993-8000
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    The time-resolved fluorescence study of kinetics and thermodynamics of Eu(III) and Tb(III) complexes with the DO2A macrocyclic ligand

    F. Smrčka and P. Lubal, New J. Chem., 2018, 42, 7993
    DOI: 10.1039/C8NJ00255J

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