Cyclometallated iridiumIJIII) complexes with 2-phenylpyridine [IrIJppy)2IJCNR)Cl] (ppy = (2-phenylpyridinato-C2 ,N), R = Xyl, Mes), [IrIJppy)2IJCNR)2]IJOTf) (R = Xyl, Mes), and fac-[IrIJppy)3] catalyse the cross-linking of polysiloxanes exclusively at temperatures above 100 °C leading to luminescent rubbers