Electrospray mass spectra of aqueous solutions of 4f-3d heterometallic chelates
Tóm tắt
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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