Lucrarea este axată pe sinteza și studiul unui șir de combinații coordinative heterometalice ale lantanidelor(III) și bis­mutului(III) cu formula generală LnBi(ttha)·nH2O (ttha6- = trietilentetraaminhexaacetat) pe rol de precursori moleculari pentru obținerea oxizilor micști BiLnO3. În baza spectrelor IR a fost stabilită prezența a două serii de complecși analogi (Ln(III) = La, Pr, Nd, Gd, Dy, unde n=7 și Ln(III) = Ho, Er, unde n=10). Analiza termogravimetrică efectuată în flux de oxigen generează oxidul preconizat BiLnO3 deja la 600oC, pe când în flux de azot acest proces nu este finalizat nici la 900oC. Difracția razelor X pe pulberile obținute la descompunerea termică a precursorilor a confirmat că viteza de cal­cinare și natura ionilor Ln(III) nu influențează compoziția reziduurilor finale, în toate cazurile obținându-se oxizii heterometalici preconizați BiLnO3 în stare pură.



The paper focuses on the synthesis and study of a series of heterometallic coordination compounds of lanthanides(III) and bismuth(III) with the general formula LnBi(ttha)·nH2O (ttha6- = triethylenetetraaminehexaacetate) as molecular pre­cursors for getting BiLnO3 mixed-oxides. Based on the IR spectra, the presence of two series of analogous complexes was established (Ln(III) = La, Pr, Nd, Gd, Dy, where n=7 and Ln(III) = Ho, Er, where n=10). Thermogravimetric analysis performed in oxygen flow results in the formation of the expected BiLnO3 oxides at already 600oC, while in nitrogen flow this process is not completed even at 900oC. Powder X-ray diffraction patterns of residues obtained upon thermal decom­po­sition of the precursors confirmed that the heating rate and the nature of Ln(III) ions do not affect the composition of the final product, in all cases these are the expected pure BiLnO3 heterometallic oxides.


coordination compounds, molecular precursors, Lanthanide(III), Bismuth(III), triethylenetetraaminehexaacetate, heating rate, mixed-oxide.

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