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Issue 4, 2018
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Unveiling excited state energy transfer and charge transfer in a host/guest coordination cage

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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 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 (1LE) state associated with the coronene moiety to a 1HGCT state with τ = 9.5 ps; and (ii) triplet–triplet energy transfer from a high 3HGCT 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 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.

Graphical abstract: Unveiling excited state energy transfer and charge transfer in a host/guest coordination cage

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Article information


Submitted
26 Sep 2017
Accepted
06 Dec 2017
First published
06 Dec 2017

Phys. Chem. Chem. Phys., 2018,20, 2205-2210
Article type
Paper

Unveiling excited state energy transfer and charge transfer in a host/guest coordination cage

R. Zhang, Y. Yang, S. Yang and K. Han, Phys. Chem. Chem. Phys., 2018, 20, 2205
DOI: 10.1039/C7CP06577A

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