Weinberger, P., Giester, G., & Steinhauser, G. (2020). Controlling Complexation Behavior of Early Lanthanides via the Subtle Interplay of their Lewis Acidity with the Chemical Stability of 5,5’-(Azobis)tetrazolide. Journal of Inorganic and General Chemistry, 646(23–24), 1882–1885. https://doi.org/10.1002/zaac.202000384
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 Ceᴵⱽ 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.
