here, we measured the lifetime of the metal-to-ligand charge transfer triplet excited state ( 3 MLCT) at 1.47 ± 0.03 µs at λprobe = 365 nm in degassed DMF under N2, which agrees well with the reported value of 1.41 ± 0.04 µs. In the presence of a Ni-OMebpy quenching mixture (1:2 OMebpy:Ni), a strong quenching effect is observed, shortening the lifetime to 0.37 ± 0.01 µs at λprobe = 365 nm (Fig. ).