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Issue 20, 2017
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Efficient crystallization-induced emission in fluorenyl-tethered carboranes

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Fluorenyl-tethered o-carborane derivatives (Fl-Cb) as both mono- and di-aryl Cb assemblies were synthesized from the corresponding alkyne and B10H12(Et2S)2 in ca. 60% yields. Crystallographic studies of di-aryl examples show rigid head-to-tail or tail-to-tail packing, while for the mono-aryl examples, only loose packing was observed. In solution, the Fl-Cb compounds exhibit strong quenching of their emission, while aggregation in a mixed solvent results in an enhanced, but still weak, emission [0.11 quantum efficiency (Φ)]. Crystallization-induced emission was observed with the di-aryl examples [Φ up to 0.95]. The excitation spectra are broadened, consistent with considerable orbital degeneracy within the crystals. Theoretical calculations suggest that the inherent orbital degeneracy and the highly-ordered crystalline aggregates contribute to the excellent crystallization-induced emission in these Fl-Cb compounds.

Graphical abstract: Efficient crystallization-induced emission in fluorenyl-tethered carboranes

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The article was received on 02 Apr 2017, accepted on 27 Apr 2017 and first published on 02 May 2017

Article type: Paper
DOI: 10.1039/C7CP02118F
Citation: Phys. Chem. Chem. Phys., 2017,19, 12928-12935
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    Efficient crystallization-induced emission in fluorenyl-tethered carboranes

    Z. Wang, T. Wang, C. Zhang and M. G. Humphrey, Phys. Chem. Chem. Phys., 2017, 19, 12928
    DOI: 10.1039/C7CP02118F

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