Synthesis and Exploration of the Reactivity of a 16‐Electron Half‐Sandwich Ir(III) Complex Featuring a Bifunctional O,N‐<i>o</i>‐Carborane Ligand

Abstract In this work, a 16‐electron half‐sandwich Ir(III) complex (Cp*Ir(OCN−Ph‐Cl)C 2 B 10 H 10 , 2 ) featuring a bifunctional O,N‐ o ‐carborane ligand was synthesized, and its reactivity was thoroughly investigated. Further studies indicate that this complex could react with various donor ligands to achieve a stable 18‐electron species. Interestingly, the obtained 16‐electron complex 2 shows acid–base responsive behavior, namely reversible structural transformation between the 16‐electron complex 2 and 18‐electron complex 4 (Cp*IrCl(OCNH−Ph‐Cl)C 2 B 10 H 10 ) with different coordination configuration. This work describes in detail the different reaction processes of half‐sandwich iridium complex and carborane ligand.