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oe1(光电查) - 科学论文

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  • Aryl substitution of pentacenes

    摘要： A series of 11 new pentacene derivatives has been synthesized, with unsymmetrical substitution based on a trialkylsilylethynyl group at the 6-position and various aryl groups appended to the 13-position. The electronic and physical properties of the new pentacene chromophores have been analyzed by UV–vis spectroscopy (solution and thin films), thermoanalytical methods (DSC and TGA), cyclic voltammetry, as well as X-ray crystallography (for 8 derivatives). X-ray crystallography has been specifically used to study the influence of unsymmetrical substitution on the solid-state packing of the pentacene derivatives. The obtained results add to our ability to better predict substitution patterns that might be helpful for designing new semiconductors for use in solid-state devices.

    关键词： organic semiconductor,pentacene,π-stacking,solid-state structure,carbon-nanomaterials,polycyclic aromatic hydrocarbon

    更新于2025-09-23 15:21:01

  • Iron(III) β-diketonates: CVD precursors for iron oxide film formation

    摘要： Within this study, the synthesis of three iron(III) β-diketonate complexes [Fe(β-diketonate)3] (β-diketonate = 2-acetylcyclopentanoate (3a), = 2-acetylcyclohexanoate (3b), = 4,4-dimethyl-1-phenyl pentanedionate (3c)) is described. The synthesis of 3a–c was performed by the reaction of the respective β-diketones with FeCl3 in the ratio of 3:1 in presence of NaOH. TG and DSC studies were carried out under an atmosphere of argon and oxygen, showing that 3b,c partly evaporate during the heating process. PXRD measurements of the as-obtained residues of 3a–c from the TG measurements confirmed the formation of crystalline α-Fe2O3 at 800 °C. Vapor pressure studies confirmed that complexes 3b and 3c show a better volatility (17.3 mbar (3b), 5.4 mbar (3c) at 120 °C) than the iron β-diketonate complexes [Fe(tfa)3] and [Fe(acac)3], respectively [62,63]. CVD studies carried out with 3a,b resulted in the formation of iron oxide thin films in presence of oxygen as reactive gas. However, complex 3c did not result in iron oxide film formation. All received layers were dense and coherent as proven by SEM studies. With metal-organic 3a and 3b, crystalline γ- and α-Fe2O3 layers were obtained at 450 °C, respectively. The XPS studies confirmed the formation of Fe2O3 layers with carbon impurities on the layer surfaces, however, in the layers no carbon could be detected.

    关键词： TG,Vapor pressure,Iron,Solid-state structure,β-Diketonate,Iron(III) oxide,CVD

    更新于2025-09-04 15:30:14