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Unveiling excited state energy transfer and charge transfer in a host/guest coordination cage. | LitMetric
Host-guest charge transfer (HGCT) plays a key role in applications from solar energy conversion to photocatalysis. Herein, a HGCT system, a pillared Pt(ii) metallacage with encapsulated coronene was synthesized and the ultrafast excited-state dynamics were investigated by combination of femtosecond transient absorption spectroscopy, nanosecond transient emission spectrocopy and quantum chemistry calculations. Two significant ultrafast dynamic processes were unveiled: (i) charge transfer from a singlet local excited (LE) state associated with the coronene moiety to a HGCT state with τ = 9.5 ps; and (ii) triplet-triplet energy transfer from a high HGCT state to a LE state with τ = 139.5 ps. The resulting long-lived species, the lowest LE and HGCT states eventually decay to the ground state in microsecond time scales of 5.2 and 43.4 μs respectively. Moreover, a clear mechanism depicting the main excited-state decay pathways connecting the initial photoexcited transients with the resulting species was proposed.
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