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Monodisperse π–π Stacking Anthracene Dimer under Pressure: Unique Fluorescence Behaviors and Experimental Determination of Interplanar Distance at Excimer Equilibrium Geometry
Author(s) -
Liu Haichao,
Dai Yuxiang,
Gao Yu,
Gao Hongcheng,
Yao Liang,
Zhang Shitong,
Xie Zengqi,
Wang Kai,
Zou Bo,
Yang Bing,
Ma Yuguang
Publication year - 2018
Publication title -
advanced optical materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.89
H-Index - 91
ISSN - 2195-1071
DOI - 10.1002/adom.201800085
Subject(s) - excimer , excited state , anthracene , materials science , stacking , fluorescence , molecular physics , redshift , crystal (programming language) , photochemistry , atomic physics , optics , chemistry , physics , nuclear magnetic resonance , quantum mechanics , galaxy , computer science , programming language
Organic light‐emitting materials are centered on their excited states. However, excited‐state geometry is hardly solved. Herein, the planar distance of an anthracene excimer is determined by integrating a monodisperse dimeric anthracene stacking in crystal and high‐pressure technique. The crystal exhibits the pure excimer fluorescence at ambient conditions, and a unique photophysical phenomenon is observed under pressure: fluorescence peak keeps constant first and then starts a gradual redshift. The theoretical potential energy curve indicates that this starting point of redshift corresponds to the excimer equilibrium geometry, which will be innovative to determine the excited‐state π–π interplanar distance ( R e ) in experiment. Moreover, high‐pressure synchrotron powder X‐ray diffraction experiment tactfully determines R e = 3.330 Å at the pressure point of initial redshift. This work not only suggests the R e determination by an original pathway but also reports a unique excimer photophysics, which may provide a reference benchmark for the further theoretical and experimental studies on aromatic excimer.