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Issue 36, 2017
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Fluorescent mesogenic boron difluoride complexes derived from heterocyclic benzoxazoles

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Abstract

One new series of boron difluoride complexes 1 derived from heterocyclic benzoxazoles 2 was reported, and their mesomorphic and optical properties were also investigated. One single crystal of the mesogenic BF2 complex 1a (m = 12, n = 8) was obtained, and its single crystal and molecular structure were resolved. The geometry coordination at the central boron atom is tetrahedral. It crystallizes in a triclinic space group P[1 with combining macron] with Z = 4. The overall molecular shape was described as slightly bent Z-shapes, and the molecular length was ca. 34.06 Å. Weak intramolecular and intermolecular H-bonds observed in the crystal lattice were attributed to the formation of mesophases. The results indicated that benzoxazoles 2a (n = 6, 8, 12) formed monotropic SmA phases, while boron difluoride complexes 1a (n = 6, 8, 12, 16) exhibited monotropic SmC mesophases. In contrast, all compounds of 2b and 1b (m = 1, n = 12 for all) were not mesogenic. Boron complexes 1 emitted a pronounced violet emission at λmax = 399 nm in solution at room temperature.

Graphical abstract: Fluorescent mesogenic boron difluoride complexes derived from heterocyclic benzoxazoles

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Publication details

The article was received on 09 Aug 2017, accepted on 28 Aug 2017 and first published on 29 Aug 2017


Article type: Paper
DOI: 10.1039/C7DT02937C
Citation: Dalton Trans., 2017,46, 12274-12283
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    Fluorescent mesogenic boron difluoride complexes derived from heterocyclic benzoxazoles

    Y. Chen, G. Lee and C. K. Lai, Dalton Trans., 2017, 46, 12274
    DOI: 10.1039/C7DT02937C

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