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Fluorescent columnar bis(boron difluoride) complexes derived from tetraketonates

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Abstract

Three new series of bis-(boron difluoride) complexes 1a–c derived from substituted tetraketonates 2a–c are reported, and their mesomorphic and optical properties have been investigated. Two single crystals of mesogenic ligand 2a (n = 6) and nonmesogenic diboron complex 1a (n = 14) were obtained, and their single crystal and molecular structures were resolved. Results show that all 2a ligands (n = 6, 8, 10, 12, 14) formed nematic and/or smectic C phases; however, all 2b–c compounds were not mesogenic. In contrast, bis(BF2) complexes 1a–b were nonmesogenic, and 1c (n = 8, 10, 12) exhibited enantiotropic columnar mesophases. Ncell = 2.70–2.86 within a column slice of 9.0 Å thick was obtained for compound 1c, indicating that a single disc-shaped molecule was stacked within columns in Colh phases. Bis(BF2) complexes 1a–c (n = 8) possess a pronounced yellow-red emission in solution at room temperature. The luminescent emission showed a strong dependence on structural moiety incorporated, with λmax = 538 (1a) < 641 (1b) < 708 nm (1c). To the best of our knowledge, this is the first example of columnar bis(BF2) complexes.

Graphical abstract: Fluorescent columnar bis(boron difluoride) complexes derived from tetraketonates

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Publication details

The article was received on 06 Apr 2017, accepted on 10 May 2017 and first published on 10 May 2017


Article type: Paper
DOI: 10.1039/C7TC01425B
Citation: J. Mater. Chem. C, 2017, Advance Article
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    Fluorescent columnar bis(boron difluoride) complexes derived from tetraketonates

    Y. Chen, Y. Lin, H. Kuo and C. K. Lai, J. Mater. Chem. C, 2017, Advance Article , DOI: 10.1039/C7TC01425B

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