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Dual ligand-based fluorescence and phosphorescence emission at room temperature from platinum thioxanthonyl complexes

Dual ligand-based fluorescence and phosphorescence emission at room temperature from platinum thioxanthonyl complexes

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GEIST, Fabian, Andrej JACKEL, Rainer F. WINTER, 2015. Dual ligand-based fluorescence and phosphorescence emission at room temperature from platinum thioxanthonyl complexes. In: Dalton Transactions. 44(9), pp. 3974-3987. ISSN 1477-9226. eISSN 1477-9234. Available under: doi: 10.1039/C4DT02410A

@article{Geist2015ligan-29692, title={Dual ligand-based fluorescence and phosphorescence emission at room temperature from platinum thioxanthonyl complexes}, year={2015}, doi={10.1039/C4DT02410A}, number={9}, volume={44}, issn={1477-9226}, journal={Dalton Transactions}, pages={3974--3987}, author={Geist, Fabian and Jackel, Andrej and Winter, Rainer F.} }

2015-02-02T08:00:10Z 2015-02-02T08:00:10Z Winter, Rainer F. Geist, Fabian 2015 New square-planar platinum(II) complexes of the type trans-[Pt(PEt<sub>3</sub>)<sub>2</sub>(Tx)(X)] (X = Br, Cl, I or CN) bearing a σ-bonded thioxanthon-2-yl (Tx) ligand have been prepared and characterised by X-ray crystallography, cyclic voltammetry, and by NMR and electronic absorption and luminescence spectroscopy. The ligand X hardly influences the electronic transitions, which indicates that the relevant molecular orbitals are largely confined to the Pt–Tx chromophore. In agreement with TD-DFT calculations the energetically lowest electronic transition is assigned as the Tx-centred π→π* HOMO → LUMO excitation. All four complexes display dual emission from the σ-bonded Tx ligand at ca. 450 nm and at ca. 510 nm, which are assigned as fluorescence originating from the <sup>1</sup>π*-state and as phosphorescence originating from the <sup>3</sup>π*-state, respectively. The phosphorescence quantum yield increases with increasing σ-donor strength of the ligand X and reaches a uniquely high value of 18.8% for the chlorido complex Pt–Cl. Switching-on of Tx phosphorescence emission by the Pt(PEt<sub>3</sub>)<sub>2</sub>(X) fragment goes along with a reduction of the lifetime of the Tx triplet state from several ms in purely organic derivatives to ca. 2 μs in the complexes. Geist, Fabian eng Winter, Rainer F. Jackel, Andrej Dual ligand-based fluorescence and phosphorescence emission at room temperature from platinum thioxanthonyl complexes terms-of-use Jackel, Andrej

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