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Long-lived triplet excited state in a platinum(II) perylene monoimide complex

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Abstract

We report the synthesis and solution based photophysical properties of a new Pt(II)-terpyridine complex coupled to a perylene monoimide (PMI) chromophoric unit through an acetylene linkage. This structural arrangement resulted in quantitative quenching of the highly fluorescent PMI chromophore by introducing metal character into the lowest energy singlet state, thereby leading to the formation of a long-lived PMI-ligand localized triplet excited state (τ = 8.4 μs). Even though the phosphorescence from this triplet state was not observed, highly efficient quenching of this excited state by dissolved oxygen and the observation of singlet oxygen photoluminescence in the near-IR at 1270 nm initially pointed towards triplet excited state character. Additionally, the coincidence of the excited state absorbance difference spectra from the sensitized PMI ligand using a triplet donor and the Pt-PMI complex provided strong evidence for this triplet state assignment, which was further supported by TD-DFT calculations.

Graphical abstract: Long-lived triplet excited state in a platinum(ii) perylene monoimide complex

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Publication details

The article was received on 18 Jun 2018, accepted on 29 Sep 2018 and first published on 03 Oct 2018


Article type: Paper
DOI: 10.1039/C8DT02496K
Citation: Dalton Trans., 2018, Advance Article
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    Long-lived triplet excited state in a platinum(II) perylene monoimide complex

    J. E. Yarnell, A. Chakraborty, M. Myahkostupov, K. M. Wright and F. N. Castellano, Dalton Trans., 2018, Advance Article , DOI: 10.1039/C8DT02496K

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