Unraveling the mechanism of NO ligand photoisomerism by time-resolved infrared spectroscopy

Geoffrey Gallé (1) , Matthieu Nicoul (2) , Theo Woike (3) , Dominik Schaniel (4) , Eric Freysz (1)

1 LOMA - Laboratoire Ondes et Matière d'Aquitaine
2 Physikalisches Institut [Köln]
3 Institut für Strukturphysik
4 CRM2 - Cristallographie, Résonance Magnétique et Modélisations

UV-Vis- and infrared femtosecond spectroscopy makes it possible to reveal all different steps of photochemical reactions after the electronic excitation. The electronic relaxations are observed in the UV-Vis spectral range whereas the nuclear motions are monitored in the infrared spectral range. We used femtosecond time-resolved infrared spectroscopy to demonstrate the photoisomerization of the NO ligand photoinduced by a visible femtosecond pulse in a Na2[Fe(CN)5NO]*2H2O single crystal occurs in about 350 fs. The analysis of data makes it possible to unravel the mechanism leading to the photoisomerization of the NO ligand.

Domaines: Chimie théorique et/ou physique; Optique [physics.optics]

Geoffrey Gallé, Matthieu Nicoul, Theo Woike, Dominik Schaniel, Eric Freysz. Unraveling the mechanism of NO ligand photoisomerism by time-resolved infrared spectroscopy. Chemical Physics Letters, 2012, 552, pp.64-68. ⟨10.1016/J.CPLETT.2012.09.071⟩. ⟨hal-00772561⟩