Stabilization of Aryl–Calcium, –Strontium, and –Barium Compounds by Designed Steric and π‐Bonding Encapsulation

Abstract

Pentafluorophenyl complexes of the heavier alkaline-earth metals (Ca, Sr, Ba) are stabilized by a novel sterically crowded triazenido ligand. The pendent arene rings of the aryl-substituted triazenide are π bonded to the alkaline-earth metal atoms, thereby suppressing decomposition pathways or ligand redistribution reactions and allowing the isolation of solvent-free derivatives (see picture; Ba: green; N: blue; F: light green; C: gray).