First paddlewheel complex with a doubly-bonded Ir26+ core

Abstract

Reaction of IrCl₃ with Hhpp in refluxing ethanol (Hhpp = 1,3,4,6,7,8-hexahydro-2H-pyramido[1,2-a]pyrimidine) yields Ir₂(hpp)₄Cl₂, the first paddlewheel complex of Ir^III, with a short Ir–Ir distance of 2.495(1) Å, an average Ir–Cl distance of 2.643[6] Å, an Ir₂⁶⁺ core bridged by four hpp ligands with two axial chlorine atoms, and a double bond between the Ir atoms.