Chromium(III)-trisoxalate, a versatile building block for luminescent materials

► We present the multifaceted photophysical behaviour of chromium(III)-tris-oxalate. ► We differentiate between phonon-assisted and resonant energy migration. ► Resonant energy migration results in spectral diffusion. ► Resonant energy transfer can be tuned via pressure dependant spectral overlap. ► π-π interactions with the second coordination sphere create specific spectroscopic sites.