57558-10-8Relevant academic research and scientific papers
Indeno[2,1-c]fluorene-based blue fluorescent oligomers and polymers: Synthesis, structure, photophysical and electroluminescence properties
Du, Bin,Wang, Lei,Yuan, Si-Chun,Lei, Ting,Pei, Jian,Cao, Yong
, p. 2935 - 2944 (2013)
An alkylated skeleton of indeno[2,1-c]fluorene, viewed as a positional isomerism of indeno[1,2-b]fluorene, was developed to construct several conjugated oligomers and polymers through a Pd-catalyzed Suzuki coupling reaction for organic light-emitting diodes. Single crystal analysis indicated that the structure of indeno[2,1-c]fluorene was twisted due to close H - -H contacts in the crowded region of molecules. P1-P3 showed good solubility in common organic solvents as well as facile film forming properties. In comparison with linear n-alkyl-substituted oligo(indeno[1,2-b]fluorene)s and poly(indeno[1,2-b]fluorene)s (2,8-PIFs), the absorption and emission features of twisted n-alkyl-substituted oligo(indeno[2,1-c]fluorene)s and poly(indeno[2,1-c]fluorene) (P1) in dilute solution exhibited a correlation to the conjugation length and obviously blue-shifted due to the distorted backbones. All polymers emitted strong blue fluorescence with very narrow full widths at half-maximum (fwhm) (about 50 nm) in dilute solution and in thin film. Electroluminescent (EL) devices with the configuration of ITO/PEDOT:PSS/PVK/ polymers/Ba/Al were fabricated to achieve blue EL emission with maximum brightness up to 2800 cd/m2 at a bias of 10 V. The EL devices using P2 as the active materials showed a maximum external quantum efficiency of 1.2% and a maximum luminous efficiency of 1.5 cd/A. Our investigations demonstrate that indeno[2,1-c]fluorene moiety might be regarded as a potential building skeleton to develop the effective blue and UV light-emitting materials.
Facile multistep synthesis of isotruxene and isotruxenone
Yang, Jye-Shane,Huang, Hsin-Hau,Lin, Shih-Hsun
supporting information; experimental part, p. 3974 - 3977 (2009/10/14)
(Chemical Equation Presented) Three multistep approaches toward facile syntheses of isotruxene (1) and isotruxenone (3) are reported. The ortho-para conjugated backbone in the precursor 4 was constructed by either Co-catalyzed [2 + 2 + 2] cyclotrimerization or the [4 + 2] Diels-Alder reactions. The regioselectivity of the triple intramolecular Friedel-Crafts acylation of 4 plays the key role in determining the overall yield. Compared to the previous one-step method, the current approaches are more efficient in terms of product yield (27-36% vs 4-18%) and purification (i.e., free of column chromatography).
