1268633-80-2

Upstream product

• 75-36-5 acetyl chloride 
• 302554-80-9 2-bromo-9,9-dioctyl-9H-fluorene 

Relevant academic research and scientific papers

Star-shaped triphenylamine terminated difluoroboron β-diketonate complexes: Synthesis, photophysical and electrochemical properties

Two new star-shaped difluoroboron β-diketonate complexes (TBC) 3Ph and (TBF)3Ph, in which the terminal groups of triphenylamine functionalized difluoroboron β-diketonates were bridged by carbazole or fluorene to the core of 1,3,5-benzene, have been synthesized. It was found that they gave high molar extinction coefficients, meaning strong light-harvesting ability, and emitted intense yellow light with fluorescence quantum yields (ΦF) of 0.73 and 0.67 for (TBC)3Ph and (TBF)3Ph, respectively, in toluene as well as red light in solid states with ΦF of 0.36 and 0.27, respectively. The electrochemical behaviors suggested that they had considerably higher electron affinities than tris(8-hydroxyquinoline)aluminum (AlQ3), which indicated that they could be used as electron-transporting materials besides emitting materials.

Branched oligophenylenes containing octylphenotiazine and dioctylfluorene groups and phen-1,3,5-triyl branching center

A series of branched oligophenylenes containing the dioctylfluorene and octylphenothiazine moieties was synthesized using the Suzuki reaction applied within the framework of the A2 + B2 + B3 approach. 1,3,5-tris(7-Bromo-9,9-di-n-octylfluoren-2-yl)benzene and 1,3,5-tris- (4-bromophenyl)benzene were used as the branching co-monomers. It was shown that the fluorescence spectra of co-oligomers containing phenothiazine moieties are shifted to the longwavelength region as compared to the spectra of that without such moieties.

Synthesis and luminescent properties of branched oligophenylenefluorenes

The spectrophotometric and luminescence studies on branched oligophenylenefluorenes have shown that the incorporation of n-octyl groups to the 9-position of the fluorene moiety does not interrupt the conjugation of internodal luminophore moieties, and there is also no aggregation or excimer emission both for functionalized and nonfunctionalized macromolecules in solution.

Conjugated diene monomer 9-9 - dialkyl fluorene as structural unit and synthesis method thereof

The invention relates to a conjugated diene monomer 9-9 - dialkyl fluorene as a structural unit and a synthesis method thereof, and belongs to the technical field of organic synthesis. 9, 9 - Dialkyl fluorene is the structural unit of the conjugated diene monomer. Herein R is a linear or branched alkyl group having a different number (6 - 30) of carbon atoms, n Shows functional groups of each intermediate, and a functional ethylenic monomer with Suzuki and 9 dialkyl fluorene as a core with different conjugation lengths can be obtained by repeating the bromination and acetylation reduction of the fluorene or 9 - fluorene oligomer. The problem of flexible expansion of chemical reaction of organic small molecules of fluorene units can be solved.

Structure-activity relationships for anion-responsive poly(squaramides): Support for an analyte-induced noncovalent polymer cross-linking mechanism

Poly(squaramides) are a novel class of anion-responsive macromolecules that incorporate the diaminocyclobutenedione hydrogen bond donor group into the polymer backbone. Herein, the synthesis and properties of a series of fluorene-based poly(squaramides) varying in conformational rigidity, squaramide content, and propensity for aggregation are described. Structure-activity relationships for the anion sensory behavior of these polymers (as probed by fluorescence titrations, dynamic light scattering, confocal fluorescence microscopy, and transmission electron microscopy) indicate that anion-induced polymer aggregation leads to a cooperative response with enhanced levels of sensitivity and selectivity. These observations are consistent with a mechanism involving noncovalent cross-linking of polymer chains through squaramide-anion hydrogen-bonding interactions and point toward new applications of polyamides as stimulus-responsive materials.

Conjugated polymers containing trifluoren-2-ylamine, trifluoren-2-ylbenzene and trifluoren-2-yltriazine for electroluminescence

A series of light-emitting conjugated polymers (LEPs) based on building blocks of electron-donating trifluoren-2-ylamine (TFA), electrically neutral 1,3,5-trifluoren-2-ylbenzene (TFB), and electron-withdrawing 2,4,6-trifluoren-2-yltriazine (TFT) were successfully synthesized via palladium-catalyzed Suzuki cross-coupling polycondensation. Their structure-property relationships were thoroughly studied. For P1 containing electron-withdrawing backbone and electron-donating pendants, their photophysical properties in solution are strongly dependent on the solvent polarity due to the intense intramolecular charge-transfer (ICT) interaction. In addition, their emission colors and energy levels could be effectively tuned by changing the structure of the main chain as well as the substituent at the pendent fluorene of TFT, TFB, and TFA. To evaluate their electroluminescence properties, double-layer devices with a configuration of ITO/PEDOT:PSS (40 nm)/emitting layer (EML) (70-80 nm)/TPBI (30 nm)/CsF (1.5 nm)/Al were fabricated, where the developed polymers were used as an EML and TPBI (2,2′,2″-(1,3,5-benzenetriyl)-tris-(1-phenyl-1H-benzimidazole)) was used as an electron-transport and hole-block layer. Deep-blue light emission was achieved for the device based on P1d, a polymer based on TFT and the second generation (G2) of carbazole dendrimer pendant, that shows a maximum current efficiency (CE) of 1.26 cd A-1, corresponding to external quantum efficiency (EQE) of 1.27%, with Commission Internationale de L'Eclairage (CIE) coordinates of (0.16, 0.14). In comparison, due to the intense ICT interaction between the main chain and the side chain, light-green emission was achieved for the device based on P1c, a polymer based on TFT and bis(9,9-dioctyl-9H-fluoren- 2-yl)amine pendant, giving the highest maximum CE of 4.10 cd A-1, corresponding to EQE of 2.45%, with CIE coordinates of (0.24,0.51), although either of the main chain and the side chain emits blue light.