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Interaction of Zn(II)-cyclen complex with aminomethylphosphonic acid: Original simultaneous potentiometric and 31P NMR data treatment

Abstract

Interaction of aminomethylphosphonic acid (H2amp) with Zn(II)-cyclen complex and formation of ternary complexes was studied by potentiometry and 31P NMR titrations. Data evaluation of each of the methods separately was found to be insufficient. Thus, data obtained from the both methods were simultaneously treated with computer program OPIUM. Determined stability constants indicated only weak (logK ~ 3) coordination of aminomethylphosphonic acid through phosphonate group. The chelating coordination mode with participation of amine group was not confirmed. In excess of Zn(II)-cyclen a formation of the dinuclear complexes in which two Zn(II)-cyclen units bridged by phosphonate group was observed and its presence was confirmed by mass spectrometry. Such coordination motif is typical for phosphonates in the solid state and also for phosphatases.

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Publication details

The article was received on 20 Jan 2017, accepted on 06 Jun 2017 and first published on 13 Jun 2017


Article type: Paper
DOI: 10.1039/C7NJ00254H
Citation: New J. Chem., 2017, Accepted Manuscript
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    Interaction of Zn(II)-cyclen complex with aminomethylphosphonic acid: Original simultaneous potentiometric and 31P NMR data treatment

    Z. Vargova, I. Rostasova, M. Vilkova, R. Gyepes, M. Litecka, V. Kubicek, J. Imrich and I. Lukes, New J. Chem., 2017, Accepted Manuscript , DOI: 10.1039/C7NJ00254H

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