Real-time observation of ultrafast electron injection at graphene-Zn porphyrin interfaces

Physical Chemistry Chemical Physics : PCCP
Dilshad MasihOmar F Mohammed

Abstract

We report on the ultrafast interfacial electron transfer (ET) between zinc(II) porphyrin (ZnTMPyP) and negatively charged graphene carboxylate (GC) using state-of-the-art femtosecond laser spectroscopy with broadband capabilities. The steady-state interaction between GC and ZnTMPyP results in a red-shifted absorption spectrum, providing a clear indication for the binding affinity between ZnTMPyP and GC via electrostatic and π-π stacking interactions. Ultrafast transient absorption (TA) spectra in the absence and presence of three different GC concentrations reveal (i) the ultrafast formation of singlet excited ZnTMPyP*, which partially relaxes into a long-lived triplet state, and (ii) ET from the singlet excited ZnTMPyP* to GC, forming ZnTMPyP˙(+) and GC˙(-), as indicated by a spectral feature at 650-750 nm, which is attributed to a ZnTMPyP radical cation resulting from the ET process.

References

Jul 29, 2011·Chemical Society Reviews·Xiao HuangHua Zhang
Sep 26, 2012·Dalton Transactions : an International Journal of Inorganic Chemistry·Páraic M KeaneSusan J Quinn
May 3, 2013·The Journal of Physical Chemistry. a·Eileen M RussellAndras Bodi
Jul 30, 2014·Chemical Communications : Chem Comm·Shawkat M AlyOmar F Mohammed

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Citations

Mar 7, 2019·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Daria LarowskaAnna Lewandowska-Andralojc
Jun 11, 2020·Physical Chemistry Chemical Physics : PCCP·Ewelina GackaAnna Lewandowska-Andralojc
Feb 3, 2018·Physical Chemistry Chemical Physics : PCCP·Poomani Ram KumarArunkumar Kathiravan
Apr 16, 2021·Luminescence : the Journal of Biological and Chemical Luminescence·Dunli LiuMingxing Jin
Nov 3, 2020·The Journal of Physical Chemistry. C, Nanomaterials and Interfaces·Daria LarowskaAnna Lewandowska-Andralojc

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