Addressing Charge-Transfer and Locally-Excited States in a Twisted Biphenyl Push-Pull Chromophore

Abstract : We present the synthesis and spectroscopic characterization of a twisted push-pull biphenyl molecule undergoing photoinduced electron transfer. Steady-state and transient absorption spectra suggest, in this rigid molecular structure, a subtle interplay between locally-excited and charge-transfer states, whose equilibrium and dynamics is only driven by solvation. A theoretical model is presented for the solvation dynamics and, with the support of quantum chemical calculations, we demonstrate the existence of two sets of states, having either local or charge-transfer character, that only "communicate" thanks to solvation, which is the sole driving force for the charge-separation process.
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Submitted on : Monday, November 18, 2019 - 2:19:17 PM
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Elisa Campioli, Somananda Sanyal, Agnese Marcelli, Mariangela Di Donato, Mireille Blanchard-Desce, et al.. Addressing Charge-Transfer and Locally-Excited States in a Twisted Biphenyl Push-Pull Chromophore. ChemPhysChem, Wiley-VCH Verlag, 2019, 20 (21), pp.2860-2873. ⟨10.1002/cphc.201900703⟩. ⟨hal-02307078⟩

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