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, active block copolymers were synthesized via an atom transfer radical polymerization of acrylate containing liquid crystalline moiety and hole transporting carbazole moiety.
Abstract: Photorefractive active block copolymers were successfully synthesized via an atom transfer radical polymerization of acrylate containing liquid crystalline moiety and hole transporting carbazole moiety. Resulting copolymers were characterized by gel permeation chromatography, NMR, and DSC. Copolymers afforded the transparent films showing birefringent nature. Photorefractive characteristics of copolymers with 2 wt% of trinitro- fluorenone as a photosensitizer were investigated by four wave mixing and two-beam coupling methods with a He-Ne laser. For the block copolymer, higher diffraction efficiency and larger coupling gain were observed compared with the corresponding statistical random copolymer.
4 citations
Journal Article•
4 citations
TL;DR: A linear dependence of the log of the quenching rate constants, log kq, upon the excited-state energy of the donors was found in this paper, where the same authors also showed that triplet benzophenone is quenched by 1 with a bimolecular rate constant of 9.9 × 106 M-1 s-1.
Abstract: Free radicals react more readily with [1.1.1]propellane, 1, than with styrene. For example Et3Si· reacts with 1 and styrene with rate constants of 6 × 108 M-1 s-1 and 2 × 108 M-1 s-1, respectively. Fluorenone, phenanthrene, triphenylene, benzophenone, and pyrene transfer electronic energy to 1 with rate constants well below the diffusion-controlled limit. For example, triplet benzophenone is quenched by 1 with a bimolecular rate constant of 9.9 × 106 M-1 s-1. A linear dependence of the log of the quenching rate constants, log kq, upon the excited-state energy of the donors is found.Key words: propellane, laser flash photolysis, free radicals, triplet states.
4 citations
Patent•
20 Jul 2016
TL;DR: In this article, N-butyl carbazole compounds containing fluorenone and a preparation method and application of the Nbutylcarbazole compound were described, and the reaction condition is mild, the equipment requirement is low, and operation is easy.
Abstract: The invention relates to N-butylcarbazole compounds containing fluorenone and a preparation method and application of the N-butylcarbazole compoundsA compound shown in the formula (IV) and a compound shown in the formula (V) serve as raw materials, a heating reflux stirring reaction is conducted for a certain time under the action of an alkaline compound, and after the complete reaction, the N-butylcarbazole compounds are obtained through filtration and column chromatographyThe reaction condition is mild, the equipment requirement is low, and operation is easy; through nuclear magnetic resonance authentication on the obtained product structure, dye-sensitized solar cells assembled with the compounds serving as dye sensitizers have high photoelectric conversion efficiency, and new applicable substances are added for screening of dye sensitizers
4 citations
Patent•
15 Jun 1999
TL;DR: In this article, the objective compound of the formula is produced by reacting fluorenone with phenoxypropanol in the presence of a catalyst comprising 10-500 ml of sulfuric acid and 0.01-100 ml of a thiol.
Abstract: PROBLEM TO BE SOLVED: To produce the subject compound by an economically advantageous process suitable for industrial production by reacting fluorenone with phenoxypropanol using sulfuric acid and a thiol as catalysts. SOLUTION: The objective compound of the formula is produced by reacting fluorenone with phenoxypropanol in the presence of a catalyst comprising 10-500 ml of sulfuric acid (having a concentration of >=75%, preferably >=95%) and 0.01-100 ml of a thiol (e.g. a 1-10C mercaptan or 2-11C mercaptocarboxylic acid) based on 1 mol of fluorenone preferably in a water-immiscible organic solvent such as toluene at 30-150 deg.C, preferably 40-100 deg.C for 1-10 hr, preferably 3-6 hr in the case of performing the reaction by batch process.
4 citations