Luminescence and reactivity of a charge-transfer excited iron complex with nanosecond lifetime

In this study, we show that octahedral coordination of iron(III) by two mono-anionic facial tris-carbene ligands can markedly suppress such deactivation. The resulting complex [Fe(phtmeimb)2]+, where phtmeimb is {phenyl[tris(3-methylimidazol-1-ylidene)]borate}–, exhibits strong, visible, room temperature photoluminescence with a 2.0-nanosecond lifetime and 2% quantum yield via spin-allowed transition from a doublet ligand-to-metal charge-transfer (2LMCT) state to the doublet ground state. Reductive and oxidative electron-transfer reactions were observed for the 2LMCT state of [Fe(phtmeimb)2]+ in bimolecular quenching studies with methylviologen and diphenylamine.

Source: ScienceNOW - January 17, 2019 Category: Science Authors: Kjaer, K. S., Kaul, N., Prakash, O., Chabera, P., Rosemann, N. W., Honarfar, A., Gordivska, O., Fredin, L. A., Bergquist, K.-E., Häggström, L., Ericsson, T., Lindh, L., Yartsev, A., Styring, S., Huang, P., Uhlig, J., Bendix, J., Strand, D. Tags: Chemistry reports Source Type: news