Complexes of Lanthanide Nitrates with Alkyl Esters of Bromomethylenediphosphonic Acid |
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| Authors: | Vladislav Arabadzhiev Galin Petrov Erhard T. K. Haupt |
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| Affiliation: | 1. Department of Chemistry , Sofia University , Sofia, Bulgaria;2. Department Chemistry , Institute of Inorganic and Applied Chemistry, University of Hamburg , Hamburg, Federal Republic of Germany |
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| Abstract: | Complexes of lanthanide nitrates (La, Ce, Sm, Gd, Er, and Yb) with tetraethyl and tetraisopropyl esters of bromomethylenediphosphonic acid were prepared. The complexes were characterized by elemental analysis, IR spectroscopy, and, in some cases, NMR. The data confirm that diphosphonates coordinate with two P[dbnd]O groups, and there are no indications for the existence of noncoordinated P[dbnd]O groups. The structure of the complexes depends only on the ionic radius of the central metal atom and not on changes in the electronic or steric behavior of the ester groups. For the complexes of La, Ce, Sm, and Gd nitrates, the formula is LnL2(NO3)3, and for Er and Yb nitrates it is Ln2L3(NO3)6 (Ln[dbnd]La, Ce, Sm, Gd, Er, Yb; L = diphosphonate). |
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| Keywords: | Complexes esters of bromomethylenediphosphonic acid lanthanide nitrates |
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