Ultrafast electronic relaxation of excited state vitamin B12 in the gas phase

N. Shafizadeh (1) , L. Poisson (2) , B. Soep (2)

1 PPM - Laboratoire de Photophysique Moléculaire
2 LFP - URA 2453 - Laboratoire Francis PERRIN

The time evolution of electronically excited vitamin B12 (cyanocobalamin) has been observed for the first time in the gas phase. It reveals an ultrafast decay to a state corresponding to metal excitation. This decay is interpreted as resulting from a ring to metal electron transfer. This opens the observation of the excited state of other complex biomimetic systems in the gas phase, the key to the characterisation of their complex evolution through excited electronic states.

Mots clés: Femtosecond dynamics; Electronic relaxation; Biomimetic molecules; Gas phase; Vitamin B12; Cyanocobalamin; Electron transfer; Porphyrins; Corrin

Domaines: Chimie théorique et/ou physique

N. Shafizadeh, L. Poisson, B. Soep. Ultrafast electronic relaxation of excited state vitamin B12 in the gas phase. Chemical Physics, 2008, 350 (1-3), pp.2-6. ⟨10.1016/j.chemphys.2007.09.032⟩. ⟨hal-00317470⟩