Twisted Donor−π–Acceptor Carbazole
Luminophores with Substituent-Dependent Properties of Aggregated Behavior
(Aggregation-Caused Quenching to Aggregation-Enhanced Emission) and
Mechanoresponsive Luminescence
Huichao Zhu
Pengfei Chen
Lin Kong
Yupeng Tian
Jiaxiang Yang
10.1021/acs.jpcc.8b05638.s005
https://acs.figshare.com/articles/dataset/Twisted_Donor_Acceptor_Carbazole_Luminophores_with_Substituent-Dependent_Properties_of_Aggregated_Behavior_Aggregation-Caused_Quenching_to_Aggregation-Enhanced_Emission_and_Mechanoresponsive_Luminescence/6989588
To get insight on
how the donor (D)/acceptor (A) substitutions
and their substitution pattern affect optical properties in solution
and in the solid state, four novel carbazole derivatives <b>C1</b>–<b>C4</b> with different terminal groups (N(CH<sub>3</sub>)<sub>2</sub>, H, Br, and CN) have been employed. Their single-crystal
X-ray structures confirm that the twisted structures, intermolecular
interactions, and loose molecular packing are functions of the terminal
groups. Interestingly, they displayed substituent-dependent aggregation-induced
behaviors and mechanochromic (MC) properties. <b>C1</b> showed
aggregation-caused quenching because of the strong intermolecular
π–π interaction, whereas <b>C2</b>, <b>C3,</b> and <b>C4</b> exhibit strong aggregation-enhanced
emission characteristics, which contributed to the formation of J-aggregates.
Different twisted conformations and molecular arrangements induce
different mechanostimuli response behaviors for <b>C1</b>–<b>C4</b> between green-yellow to red color along with large red-shifts
of 63, 30, 56, and 49 nm, respectively. <b>C1</b>, <b>C3</b>, and <b>C4</b> displayed obvious MC characteristics, but <b>C2</b> displayed irreversible mechanostimulus behavior. Powder
X-ray diffraction and single-crystal X-ray analysis revealed that
planarization of the twisted structure extended the π-conjugation
and the destruction of the crystalline structure accounted for the
tuned solid-state fluorescence.
2018-08-09 00:00:00
powder X-ray diffraction
aggregation-enhanced emission characteristics
mechanostimuli response behaviors
single-crystal X-ray analysis
C 4 exhibit
single-crystal X-ray structures
substitution
MC
C 1
CN
interaction
C 2
substituent-dependent aggregation-induced behaviors
terminal groups