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Title: Triboluminescence of centrosymmetric lanthanide β-diketonate complexes with aggregation-induced emission
Authors: Wong, HY 
Chan, TKW 
Law, GL 
Issue Date: 2019
Source: Molecules, 2019, v. 24, no. 4, 662
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-Cl 2 ) 3 phen] and [Eu(mm-dbm-Cl 2 ) 3 phen], 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 P2 1 /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.
Keywords: Lanthanide
Publisher: Molecular Diversity Preservation International (MDPI)
Journal: Molecules 
ISSN: 1420-3049
DOI: 10.3390/molecules24040662
Rights: © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (
The following publication Wong, H. Y., Chan, W. T. K., & Law, G. L. (2019). Triboluminescence of Centrosymmetric Lanthanide β-Diketonate Complexes with Aggregation-Induced Emission. Molecules, 24(4), 662 is available at
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