Electrospray mass spectra of aqueous solutions of 4f-3d heterometallic chelates |
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| Authors: | A. M. Makarevich B. G. Kimel’ N. P. Kuz’mina |
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| Affiliation: | (1) Faculty of Materials Science, Moscow State University, Vorob’evy gory, Moscow, 119991, Russia;(2) Zelinskii Institute of Organic Chemistry, Russian Academy of Sciences, Leninskii pr. 47, Moscow, 119991, Russia;(3) Faculty of Chemistry, Moscow State University, Vorob’evy gory, Moscow, 119991, Russia |
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| Abstract: | The composition of aqueous solutions of the heterometallic chelates MLnDTPA and Ln2M3(EDTA)3 (H5DTPA = diethylenetriaminepentaacetic acid; H4EDTA = ethylenediaminetetraacetic acid; Ln = Eu, La; M = Ni, Mn) and the monometallic chelates H3Ni(DTPA), HNi2(DTPA), H2La(DTPA), and H2Eu(DTPA) was studied by electrospray mass spectrometry (ESIMS). The mass spectra indicate that there is equilibrium between chelated rare-earth and 3d-metal ions in the aqueous solution of the heterometallic chelates. Both monometallic and bimetallic diethylenetriaminepentaacetates are observed for the 3d elements. The intensity ratio of the chelated rare-earth and 3d-metal ions in the aqueous solutions of the heterometallic complexes is in agreement with the ratio of the stability constants of the respective monometallic chelates. |
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