Abstract
Two series of complexes of meconic acid (H3 Mec) with rare-earths have been prepared by varying the preparative procedure. The compounds have the general formulae, [Ln(Mec) (H2O)2]·3 H2O (whereLn=La, Ce, Pr, Nd, Sm, Ho and Y) and [Ln(HMec) (H2 Mec) (H2O)2]·4 H2O (whereLn=La, Pr, Nd and Sm). The infrared spectral data indicate that the carboxylate groups are bound to the rare-earth metal in a bidentate fashion. Thermal studies indicate that two water molecules are coordinated in each case. The complexes are probably polymeric.
Zusammenfassung
Es wurden zwei Reihen von Komplexen der Meconsäure (H3 Mec) mit Seltenerd-Metallen mit den allgemeinen Formeln [Ln(Mec)(H2O)2]·3 H2O (Ln=La, Ce, Pr, Nd, Sm, Ho, Y) und [Ln(HMec)2(H2 Mec) (H2O)2]·4 H2O (Ln=La, Pr, Nd, Sm) hergestellt. Die IR-Spektren zeigen, daß die Carboxylat-Gruppen in zweizähniger Weise mit den Metallionen koordinieren; thermische Untersuchungen ergeben, daß in beiden Reihen jeweils zwei Wassermoleküle zusätzlich koordiniert sind. Die Komplexe weisen wahrscheinlich eine Polymerstruktur auf.
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Koppikar, D.K., Soundararajan, S. Complexes of rare-earth metals with meconic acid. Monatshefte für Chemie 112, 167–173 (1981). https://doi.org/10.1007/BF00911083
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DOI: https://doi.org/10.1007/BF00911083