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Molecules 2019, 24(4), 662; https://doi.org/10.3390/molecules24040662

Triboluminescence of Centrosymmetric Lanthanide β-Diketonate Complexes with Aggregation-Induced Emission

Department of Applied Biology and Chemical Technology, Hong Kong Polytechnic University, Hung Hom, Kowloon 999077, Hong Kong, China
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Author to whom correspondence should be addressed.
Academic Editor: Gregor Drummen
Received: 11 January 2019 / Revised: 4 February 2019 / Accepted: 5 February 2019 / Published: 13 February 2019
(This article belongs to the Special Issue Lumino and Fluorophores—Illuminating Science and Technology)
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Abstract

Triboluminescence (TL) is a form of light emission induced upon mechanical forces on the material. However, our understanding of this phenomenon is still unclear and more examples are therefore needed in order to elucidate its mechanism. In this work, two types of TL complexes, [Eu(pp-dbm-Cl2)3phen] and [Eu(mm-dbm-Cl2)3phen], which also displays aggregation-induced emission (AIE) were synthesized and investigated for its photo-physical and crystal structural properties. These complexes were crystallized in a centro-symmetric space group P21/n, and remarkably, displayed TL upon grinding that may be due to the presence of extensive π···π, C-H···π and C-H···Cl-C interactions in the close molecular packing of its structure. This rare example deviates from the widely accepted mechanism of TL, hence widening the scope of our understanding in the area. View Full-Text
Keywords: triboluminescence; lanthanide; β-diketonate triboluminescence; lanthanide; β-diketonate
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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    Description: SI and x ray crystal data
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Wong, H.-Y.; Chan, W.T.K.; Law, G.-L. Triboluminescence of Centrosymmetric Lanthanide β-Diketonate Complexes with Aggregation-Induced Emission. Molecules 2019, 24, 662.

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