Topic
Fluorenone
About: Fluorenone is a research topic. Over the lifetime, 1067 publications have been published within this topic receiving 17162 citations. The topic is also known as: Diphenylene ketone & 9-Oxofluorene.
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TL;DR: In this paper, the OH radical-initiated gas phase reaction of phenanthrene in the presence of NOx was investigated in a 6400-1 indoor all-Teflon chamber.
53 citations
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TL;DR: Organic solar cell devices based on NAI-FN-NAI (BO) as an acceptor exhibit the highest performance with an open circuit voltage (VOC) of 0.88 V, a short-circuit current density (JSC) of 9.1 mAcm-2, a fill factor (FF) of 45%, and an overall power conversion efficiency (PCE) of 3.6%.
Abstract: We designed, synthesized, and characterized a series of novel electron deficient small molecule nonfullerene acceptors based on 1,8-naphthalimide (NAI) and 9-fluorenone (FN) with different branched alkyl chains using various techniques. These molecules are based on an acceptor–donor–acceptor–donor–acceptor (A1–D–A2–D–A1) molecular design configuration with NAI as the end-capping acceptor (A1), FN as electron-withdrawing central (A2) group, and thiophene ring as a donor (D) unit. These materials are named as NAI-FN-NAI (BO) and NAI-FN-NAI (HD) where BO and HD represent butyloctyl and hexyldecyl alkyl groups, respectively. To further modify energy levels of these materials, we converted the weak electron withdrawing ketonic group (C═O) attached to the FN moiety of NAI-FN-NAI (BO) to a stronger electron withdrawing cyano group (C≡N) to obtain the compound NAI-FCN-NAI (BO) by keeping the same alkyl chain. The optical, electrochemical, and thermal properties of the new acceptors were studied. The materials exh...
52 citations
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TL;DR: Zhang et al. as mentioned in this paper presented a metal organic framework with zinc as the metal cation by a facile mechanochemical synthesis method, and the obtained Zn-FDC MOF features a pillared structure, in which the fluorenone chromophore units exhibit a highly ordered arrangement.
Abstract: The regular assembly of organic chromophores into ordered supramolecular solids has received much attention for developing high-performance luminescent materials. Herein, a fluorenone-containing dicarboxylate (FDC) has been organized into a metal organic framework (MOF) with zinc as the metal cation by a facile mechanochemical synthesis method. The obtained Zn–FDC MOF features a pillared structure, in which the fluorenone chromophore units exhibit a highly ordered arrangement. Compared with the pristine FDC sample, the Zn–FDC MOF presents blue-shifted emission, as well as enhanced photoluminescence quantum yield and fluorescence lifetime, demonstrating the ordered arrangement of the FDC within the MOF is beneficial for the improvement of the photo-related properties of the organic chromophore. Moreover, the Zn–FDC MOF film exhibits well-defined polarized photoemission with a polarized anisotropy of 0.10–0.15. Periodic density functional theoretical (DFT) calculations illustrate that no energy/electronic transfer occurs between the chromophore and the metal cation, and the valence electrons localized in the FDC are confined effectively due to the energy blocking action of the metal cations. Combining experimental and theoretical studies on the luminescent MOF system, this work not only gives a rapid and environmentally friendly way to prepare a highly ordered inorganic–organic hybrid system with improved fluorescence properties, but also provides a deep understanding of the electronic structure of the 2D pillared MOF. It is expected that the Zn–FDC MOF can be potentially applied as a polarized fluorescence material.
52 citations
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TL;DR: In this article, the rate coefficients for the dominant photophysical processes depopulating the fluorescent state have been found to depend on the solvent and temperature, and the solvent dependence is attributed to the different extent of energy shift for the various excited states involved in these processes.
Abstract: Fluorescence lifetimes, fluorescence quantum yields, and triplet yields have been measured as a function of temperature in
five solvents of different polarity. The rate coefficients for the dominant photophysical processes depopulating the fluorescent
state have been found to depend on the solvent and temperature. The solvent dependence is attributed to the different extent
of energy shift for the various excited states involved in these processes. The experimental results require the assumption
of temperature-dependent and -independent singlet-triplet intersystem crossing rates. The temperature-dependent process
is identified as a thermoneutral or endothermic transition from the lowest excited singlet to a higher triplet state.
51 citations
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TL;DR: Fluorenone derivatives with various lengths of peripheral alkyl chains (with carbon numbers of n = 12-18) were synthesized, and their self-assembled adlayers were investigated in solvents as mentioned in this paper.
Abstract: Fluorenone derivatives (F–OCn) with various lengths of peripheral alkyl chains (with carbon numbers of n = 12–18) were synthesized, and their self-assembled adlayers were investigated in solvents w...
51 citations