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Unveiling Excited-State Charge and Energy Transfer in a Host/Guest Coordination Cage

Abstract

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 encapsulation of coronene was synthesized and the ultrafast excited-state dynamics were investigated by using femtosecond transient absorption spectroscopy and nanosecond transient emission spectrocopy. Two significant ultrafast dynamic processes were unveiled: (i) charge transfer from a singlet local excited (1LE) state associated with the coronene moiety to a1HGCT state with τ=9.5 ps; and (ii) triplet-triplet energy transfer from a high3HGCT state to a 3LE state with τ=139.5 ps. The resulting long-lived species, the lowest 3LE and 3HGCT states eventually decay to the ground state in microsecond time scales, 5.2 and 43.4 μs respectively. Moreover, a clear mechnism decipting the main excited-state decay pathwaysconnecting the initial photoexcited transients with the resulting species was proposed.

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Publication details

The article was received on 26 Sep 2017, accepted on 06 Dec 2017 and first published on 06 Dec 2017


Article type: Paper
DOI: 10.1039/C7CP06577A
Citation: Phys. Chem. Chem. Phys., 2017, Accepted Manuscript
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    Unveiling Excited-State Charge and Energy Transfer in a Host/Guest Coordination Cage

    K. Han, R. Zhang, Y. Yang and Y. Songqiu, Phys. Chem. Chem. Phys., 2017, Accepted Manuscript , DOI: 10.1039/C7CP06577A

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