[Zurück]

P. Weinberger, G. Giester, G. Steinhauser:
"Controlling complexation behavior of early lanthanides via the subtle interplay of their Lewis acidity with the chemical stability of 5,5´‐(azobis)tetrazolide";
Zeitschrift für Anorganische und Allgemeine Chemie, 646 (2020), 23-24; S. 1882 - 1885.

Two novel nitrogen‐rich lanthanide compounds of 5,5'‐(azobis)tetrazolide (ZT) were synthesized and structurally characterized. The dinuclear, isostructural compounds [Ce₂(ZT)₂CO₃(H₂O)₁₂] · 4 H₂O (1) and [Pr₂(ZT)₂CO₃(H₂O)₁₂]·4 H₂O (2) were synthesized via two independent routes. Compound 1 was obtained after partial Lewis acidic decomposition of ZT by Ce^IV in aqueous solution of (NH₄)₂Ce(NO₃)₆ and Na₂ZT. Compound 2 was obtained by crystallization from aqueous solutions of Pr(NO₃)₃, Na₂ZT, and Na₂CO₃. By X‐ray diffraction analysis at 200 K, it was found that the trivalent lanthanide cations are bridged by a bidentate carbonato ligand and each cation is further coordinated by six H₂O ligands and one ZT ligand thus being ninefold coordinated.

Lewis acidity; Lanthanides; Dinuclear complex; X-ray diffraction; 5,5´-Azobis[tetrazolide]

http://dx.doi.org/10.1002/zaac.202000384

https://publik.tuwien.ac.at/files/publik_292399.pdf