Abstract
AbstractCarbon dots (CDs) and their derivatives are useful platforms for studying electron‐donor/acceptor interactions and dynamics therein. Herein, we couple amorphous CDs with phthalocyanines (Pcs) that act as electron donors with a large extended π‐surface and intense absorption across the visible range of the solar spectrum. Investigations of the intercomponent interactions by means of steady‐state and pump‐probe transient absorption spectroscopy reveal symmetry‐breaking charge transfer/separation and recombination dynamics within pairs of phthalocyanines. The CDs facilitate the electronic interactions between the phthalocyanines. Thus, our findings suggest that CDs could be used to support electronic couplings in multichromophoric systems and further increase their applicability in organic electronics, photonics, and artificial photosynthesis.
Highlights
Carbon dots (CDs) and their derivatives are useful platforms for studying electron-donor/acceptor interactions and dynamics therein
In the photosynthetic reaction center of purple bacteria, electron transfer from a bacteriochlorophyll “special pair”, surrounded by two branches of protein-bound cofactors, is preceded by a symmetry-breaking charge-transfer (SB-CT) state; this is generally defined as arising from a photoexcited process, where a pair of identical chromophores produces a desymmetrized charge-transfer (CT) state
Molecular materials which are capable of undergoing SB-CT will very likely find applications in fields such as organic photovoltaics,[3] photonics,[4] and artificial photosynthesis.[5]
Summary
Carbon dots (CDs) and their derivatives are useful platforms for studying electron-donor/acceptor interactions and dynamics therein. The optoelectronic properties of the NCND-ZnPc conjugate were first analyzed by comparison with the two references, namely NCNDs and ZnPc, using steady-state absorption and fluorescence spectroscopy (Figure 2, methanol at room temperature). The NCND-ZnPc conjugate presents a different absorption spectrum than the two references.
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