Fig. 1: Synthesis and characterizations of [Os] complexes.

a Synthesis of przpOs and trzpOs. b Single-crystal X-ray structure of przpOs from the side and top views (thermal ellipsoids: 30%). c UV-visible (UV-vis) absorption and photoluminescence (PL) spectra of 10-5 M przpOs and trzpOs in dichloromethane. d PL lifetimes of 10-5 M przpOs and trzpOs in N2 and CO2 atmosphere.