28320-32-3Relevant articles and documents
Tricolor Luminescence Switching by Thermal and Mechanical Stimuli in the Crystal Polymorphs of Pyridyl-substituted Fluorene
Guan, Jianping,Xu, Fan,Tian, Chang,Pu, Liang,Yuan, Mao-Sen,Wang, Jinyi
, p. 216 - 222 (2019)
Stimuli-responsive organic luminescence-switching materials have attracted much attention for a decade. Most of the reported examples display a reversible two-color luminescence switching, and multicolor-switching materials remain extremely rare. Herein, we report a simple organic molecule, 4,4′-(9,9-dimethyl-9H-fluorene-2,7-diyl)dipyridine (MFDP), which exhibits three different crystal polymorphs (V-MFDP, B-MFDP and G-MFDP) with different luminescent colors. Furthermore, the three crystal polymorphs show a reversible tricolor fluorescent switching from violet to blue and to green upon physical stimuli. The single-crystal structures of the three polymorphs were obtained, and the results indicate that the stimuli-responsive properties of the three polymorphs come from the different stacking modes induced by intermolecular interactions. The competition between weak π–π stacking and weak hydrogen bonding is the main reason for the the phase transformations among the three crystal polymorphs.
Bifunctional fluorescent quenching detection of 2,4,6-trinitrophenol (TNP) and acetate ions via 4,4′-(9,9-dimethyl-9H-fluorene-2,7-diyl)dibenzoic acid
Ni, Jue Chen,Yan, Jie,Zhang, Li Jing,Shang, Di,Du, Ning,Li, Shuang,Zhao, Jin Xin,Wang, Yang,Xing, Yong Heng
, p. 4978 - 4982 (2016)
The 4,4′-(9,9-dimethylfluorene-2,7-diyl)dibenzoic acid (5) was synthesized using commercial fluorene as the starting material followed by processes of bromination, methylation, Suzuki coupling and hydrolysis. We reported it as an exclusive fluorescence sensor for 2,4,6-trinitrophenol (TNP) and acetate ions for the first time. The experimental results suggested a high efficiency for TNP detection with KSVvalues of 21,215?M?1, which has achieved to micromolar level (10?μM) of this material. Moreover, the detection limit (1.39?×?10?6?M) was measured according to the fluorescence intensity changes of Ac?in CH3CN.
Self-repairing platinum metal gel material as well as preparation method and application thereof
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Paragraph 0126-0127, (2021/11/21)
The invention discloses a self-repairing platinum metal gel and a preparation method and application thereof, and belongs to the field of self-repair metal gel materials. A self-healing platinum metal gel Pt-4 CHO, having the structure of Formula I, by performing a series of substitution reactions to the feedstock 2, 7 - dibromo - 9H - fluorene. With sonogashira-and CHO aldehyde group conversion into imine-based synthetic model molecule Pt 4 Pt 4 Pt-4 imine through Schiff base reaction, the prepared platinum metal gel has good self-repairing property, optical transparency, mechanical property and light-limiting property, and laser protection performance is further improved due to nonlinear scattering of laser in the gel.
Clickable azide-functionalized bromoarylaldehydes – synthesis and photophysical characterization
Friedrich, Marius,G?bel, Dominik,Lork, Enno,Nachtsheim, Boris J.
supporting information, p. 1683 - 1692 (2021/06/25)
Herein, we present a facile synthesis of three azide-functionalized fluorophores and their covalent attachment as triazoles in Huisgen-type cycloadditions with model alkynes. Besides two ortho- and para-bromo-substituted benzaldehydes, the azide functionalization of a fluorene-based structure will be presented. The copper(I)-catalyzed azide–alkyne cycloaddition (CuAAC) of the so-synthesized azide-functionalized bromocarbaldehydes with terminal alkynes, exhibiting different degrees of steric demand, was performed in high efficiency. Finally, we investigated the photophysical properties of the azide-functionalized arenes and their covalently linked triazole derivatives to gain deeper insight towards the effect of these covalent linkers on the emission behavior.
