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

Yarnell, James E.; Chakraborty, Arnab; Myahkostupov, Mykhaylo; Wright, Katherine M.; Castellano, Felix N.

doi:10.1039/c8dt02496k

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

Journal Article · Wed Oct 03 00:00:00 EDT 2018 · Dalton Transactions

DOI:https://doi.org/10.1039/c8dt02496k· OSTI ID:1633630

^[1]; Chakraborty, Arnab ^[2]; ^[2]; Wright, Katherine M. ^[2]; ^[2]

North Carolina State Univ., Raleigh, NC (United States); NC State University
North Carolina State Univ., Raleigh, NC (United States)

We report here 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. Furthermore, 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.

View Accepted Manuscript (DOE)

Research Organization:: North Carolina State Univ., Raleigh, NC (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: SC0011979

OSTI ID:: 1633630

Alternate ID(s):: OSTI ID: 1476959

Journal Information:: Dalton Transactions, Journal Name: Dalton Transactions Journal Issue: 42 Vol. 47; ISSN 1477-9226; ISSN ICHBD9

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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