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Possible non‐radiative decay pathways of [Cr(tpe)2]3+: multiphonon relaxation by ligand CH modes (a: in purple), by water OH modes (b: in red), by acetonitrile CH modes (c: in red); Dexter energy transfer to 3O2 (d: in blue) and electron transfer from azulene Az (e: in green). Distances to CH3CN and H2O estimated from XRD analyses (see above).
