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Issue 26, 2011
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Photophysical and electrochemical properties of Ru(ii) complexes containing tridentate bisphosphino-oligothiophene ligands

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Abstract

Nine Ru(II) complexes containing the conjugated oligothiophene ligands 3,3′′-bis(diphenylphosphino)-2,2′:5′,2′′-terthiophene (P2T3) and 4′,3′′′-bis(diphenylphosphino)-3,3′′′′-dihexyl- 2,2′:5′,2′′:5′′,2′′′:5′′′,2′′′′-pentathiophene (P2T5) were prepared and characterized. P2T3 and P2T5 bond as tridentate ligands and three of the complexes (1, 2 and 5) form green five-coordinate Ru(II) complexes in solution. Cyclic voltammetry, variable temperature UV-vis spectroscopy and time-resolved transient absorption spectroscopy were used to characterize the electronic properties of the complexes. Increased conjugation in the complexes containing the P2T5 ligand resulted in a lowering of the oxidation potential of the oligothiophene, but electropolymerization was not observed. The electronic spectra were dominated by π–π* transitions. All of the complexes were non-emissive both at room temperature and low temperature, indicating the excited state decays by other, non-radiative pathways. The transient absorption spectrum of complex 7 shows a species with a band at 475 nm and a lifetime of ∼100 ns, assigned to a ligand-based triplet state.

Graphical abstract: Photophysical and electrochemical properties of Ru(ii) complexes containing tridentate bisphosphino-oligothiophene ligands

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Publication details

The article was received on 08 Feb 2011, accepted on 13 Apr 2011 and first published on 06 Jun 2011


Article type: Paper
DOI: 10.1039/C1DT10217F
Dalton Trans., 2011,40, 6912-6921

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    Photophysical and electrochemical properties of Ru(II) complexes containing tridentate bisphosphino-oligothiophene ligands

    A. M. Kuchison, M. O. Wolf and B. O. Patrick, Dalton Trans., 2011, 40, 6912
    DOI: 10.1039/C1DT10217F

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