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Issue 18, 2017
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Unusual emission properties of the selected organosilicon compounds containing a styryl-carbazole chromophore: inversion of the singlet excited states

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Abstract

The spectroscopic and photophysical properties of silicon-containing styryl-carbazole were investigated in various solvents, and the results were analyzed with reference to its carbon derivatives. In n-hexane, both the silicon- and the carbon-containing compounds had very similar emission properties. In acetonitrile, the emission properties remained the same for the C-compound but changed significantly for the Si-compounds. In particular, the fluorescence spectra of the latter were red-shifted, and their radiative rate constants were even 7 times larger than in n-hexane, which suggested that the emissive states of the silicon-containing compounds were different in these two solvents. DFT calculations using the CAM-B3LYP functional showed that the emissive state of the C-compound involves the LUMO+1 orbital regardless of the medium. In contrast, for the Si-compound, changing the medium from n-hexane to acetonitrile resulted in the inversion of the emissive states from an excited state involving the LUMO+1 orbital (the dipole moment μ = 4.2 D) to an excited state involving the LUMO orbital (μ = 8.9 D).

Graphical abstract: Unusual emission properties of the selected organosilicon compounds containing a styryl-carbazole chromophore: inversion of the singlet excited states

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Publication details

The article was received on 27 Feb 2017, accepted on 05 Apr 2017 and first published on 07 Apr 2017


Article type: Paper
DOI: 10.1039/C7CP01292F
Citation: Phys. Chem. Chem. Phys., 2017,19, 11698-11705
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    Unusual emission properties of the selected organosilicon compounds containing a styryl-carbazole chromophore: inversion of the singlet excited states

    K. Rachuta, M. Bayda, M. Majchrzak, J. Koput and B. Marciniak, Phys. Chem. Chem. Phys., 2017, 19, 11698
    DOI: 10.1039/C7CP01292F

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