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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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)<sub>3</sub>] (BF<sub>4</sub>)<sub>2</sub> (phen = 1,10-phenantroline) complex dissolved in acetonitrile. This complex was excited by picosecond and ...Leer más >
We report on the light induced spin crossover dynamics of [Fe(phen)<sub>3</sub>] (BF<sub>4</sub>)<sub>2</sub> (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 <sup>1</sup>A<sub>1</sub> → <sup>1</sup>MLCT optical transition. Our analysis that well reproduces the recorded transient absorptions suggests this complex relaxes following inter-system crossing cascade: <sup>1</sup>MLCT(<i>S</i> = 0) → <sup>3</sup>MLCT(<i>S</i> = 1) → <sup>5</sup>T<sub>2</sub>(<i>S</i> = 2) → <sup>1</sup>A<sub>1</sub>(<i>S</i> = 0). The <sup>3</sup>MLCT and <sup>5</sup>T<sub>2</sub> states were identified, thanks to the triplet-triplet <sup>3</sup>MLCT → <sup>3</sup>MLCT<sup>∗</sup> and <sup>5</sup>T<sub>2</sub> → <sup>5</sup>MLCT 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.< Leer menos
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