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/content/aca/journal/sdy/3/4/10.1063/1.4949363
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50.See supplementary material at http://dx.doi.org/10.1063/1.4949363 for a global fit of the visible data with four exponentials, an analysis of spectral shifts of visible and infrared data, and a lifetime map of vibrational dynamics.[Supplementary Material]
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/content/aca/journal/sdy/3/4/10.1063/1.4949363
2016-05-12
2016-09-30

Abstract

We combined femtosecond (fs) VIS pump–IR probe spectroscopy with fs VIS pump–supercontinuum probe spectroscopy to characterize the photoreaction of the hexacoordinated Al(tpfc-Br)(py) in a comprehensive way. Upon fs excitation at ∼400 nm in the Soret band, the excitation energy relaxes with a time constant of (250 ± 80) fs to the S and S electronic excited states. This is evident from the rise time of the stimulated emission signal in the visible spectral range. On the same time scale, narrowing of broad infrared signals in the C=C stretching region around 1500 cm−1 is observed. Energy redistribution processes are visible in the vibrational and electronic dynamics with time constants between ∼2 ps and ∼20 ps. Triplet formation is detected with a time constant of (95 ± 3) ps. This is tracked by the complete loss of stimulated emission. Electronic transition of the emerging triplet absorption band overlaps considerably with the singlet excited stateabsorption. In contrast, two well separated vibrational marker bands for triplet formation were identified at 1477 cm−1 and at 1508 cm−1. These marker bands allow a precise identification of triplet dynamics in corrole systems.

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