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Electron delocalization in a ruthenium(II) bis(2,2′:6′, 2″-terpyridyl) complex

Lookup NU author(s): Professor Andrew Benniston, Glen Chapman, Emeritus Professor Anthony Harriman, Maryam Mehrabi, Craig Sams

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Abstract

Photophysical properties have been recorded for a ruthenium(II) bis(2,2′:6′,2″-terpyridine) complex bearing a single ethynylene substituent. The target compound is weakly emissive in fluid solution at room temperature, but both the emission yield and lifetime increase dramatically as the temperature is lowered. As found for the unsubstituted parent complex, the full temperature dependence indicates that the lowest-energy triplet state couples to two higher-energy triplets and to the ground state. Luminescence occurs only from the lowest-energy triplet state, but the radiative and nonradiative decay rates indicate that electron delocalization occurs at the triplet level. Comparison of the target compound with the parent complex indicates that the ethynylene group reduces the size of the electron-vibrational coupling element for nonradiative decay of the lowest-energy triplet state. Although other factors are affected by substitution, this is by far the most important feature with regard to stabilization of the triplet state.


Publication metadata

Author(s): Benniston AC, Chapman G, Harriman A, Mehrabi M, Sams CA

Publication type: Article

Publication status: Published

Journal: Inorganic Chemistry

Year: 2004

Volume: 43

Issue: 14

Pages: 4227-4233

ISSN (print): 0020-1669

ISSN (electronic): 1520-510X

Publisher: American Chemical Society

URL: http://dx.doi.org/10.1021/ic035380e

DOI: 10.1021/ic035380e


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