Controlling Complexation Behavior of Early Lanthanides via the Subtle Interplay of their Lewis Acidity with the Chemical Stability of 5, 5'‐(Azobis)tetrazolide. Issue 23 (12th November 2020) - Weinberger, Peter
Abstract : Two novel nitrogen‐rich lanthanide compounds of 5, 5'‐( azo bis )tetrazolide (ZT) were synthesized and structurally characterized. The dinuclear, isostructural compounds [Ce2 (ZT)2 CO3 (H2 O)12 ] · 4 H2 O (1 ) and [Pr2 (ZT)2 CO3 (H2 O)12 ]· 4H2 O (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 )2 Ce(NO3 )6 and Na2 ZT. Compound 2 was obtained by crystallization from aqueous solutions of Pr(NO3 )3, Na2 ZT, and Na2 CO3 . 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 H2 O ligands and one ZT ligand thus being ninefold coordinated. Abstract :