TRIBOLLET, J.; GALLE, Geoffrey; JONUSAUSKAS, Gediminas; DELDICQUE, D.; TONDUSSON, Marc; LÉTARD, Jean-François; FREYSZ, Eric

doi:10.1016/j.cplett.2011.07.048

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TRIBOLLET, J.
Laboratoire Ondes et Matière d'Aquitaine [LOMA]

GALLE, Geoffrey
Laboratoire Ondes et Matière d'Aquitaine [LOMA]

JONUSAUSKAS, Gediminas
Laboratoire Ondes et Matière d'Aquitaine [LOMA]

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Chemical Physics Letters. 2011, vol. 513, n° 1-3, p. 42-47

Elsevier

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We report on the light induced spin crossover dynamics of [Fe(phen)3] (BF4)2 (phen = 1,10-phenantroline) complex dissolved in acetonitrile. This complex was excited by picosecond and femtosecond laser pulses whose central frequency was centered on the 1A1 → 1MLCT optical transition. Our analysis that well reproduces the recorded transient absorptions suggests this complex relaxes following inter-system crossing cascade: 1MLCT(S = 0) → 3MLCT(S = 1) → 5T2(S = 2) → 1A1(S = 0). The 3MLCT and 5T2 states were identified, thanks to the triplet-triplet 3MLCT → 3MLCT∗ and 5T2 → 5MLCT optical transitions. Our experiments well agree with the relaxation mechanism recently proposed and clearly indicate the impact of the solvent on the measured relaxation constant time.< Réduire

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Transient absorption spectroscopy of the iron(II) [Fe(phen)<sub>3</sub>]<sup>2+</sup> complex: Study of the non-radiative relaxation of an isolated iron(II) complex

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