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Issue 26, 2018
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Weak interactions but potent effect: tunable mechanoluminescence by adjusting intermolecular C–H⋯π interactions

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Abstract

A new mechanoluminescent material (4-(diphenylamino)phenyl)(4-(diphenylphosphanyl)phenyl)methanone (CDpP), which displays tunable mechanoluminescent emission colors, has been designed and successfully synthesized. CDpP shows two distinct mechanoluminescent colors (blue and green) in different crystalline states. Single-crystal analyses and femtosecond transient emission studies reveal that the striking tunable mechanoluminescence properties of CDpP mainly originate from the different C–H⋯π interactions in the crystal structures. CDpP crystals with more C–H⋯π interactions show blue mechanoluminescence (ML), and the emission is attributed to the locally excited (LE)-state because the twisting process for the excited state is restricted by C–H⋯π interactions. Conversely, CDpP crystals with fewer C–H⋯π interactions display green ML, in which the red-shifted emission band originates from the twisted intramolecular charge transfer (TICT) excited state because the diphenylamine moiety is relatively free to rotate. The manipulation of weak intermolecular interactions in the crystalline state is a useful and reliable strategy for the tuning of the ML emission wavelengths.

Graphical abstract: Weak interactions but potent effect: tunable mechanoluminescence by adjusting intermolecular C–H⋯π interactions

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Publication details

The article was received on 13 Apr 2018, accepted on 02 Jun 2018 and first published on 04 Jun 2018


Article type: Edge Article
DOI: 10.1039/C8SC01703D
Citation: Chem. Sci., 2018,9, 5787-5794
  • Open access: Creative Commons BY license
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    Weak interactions but potent effect: tunable mechanoluminescence by adjusting intermolecular C–H⋯π interactions

    Z. Xie, T. Yu, J. Chen, E. Ubba, L. Wang, Z. Mao, T. Su, Y. Zhang, M. P. Aldred and Z. Chi, Chem. Sci., 2018, 9, 5787
    DOI: 10.1039/C8SC01703D

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