- Synthesis and Electronic Properties of Novel 5,7-Diazapentacene Derivatives
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A route to the synthesis of novel 5,7-diazapentacenes and some preliminary studies on their properties is reported. A single crystal X-ray diffraction study of the dihexyl derivative showed it had formed a dimer during the analysis. The materials possess lower lying frontier orbitals than pentacene and may have potential applications in organic electronic devices. This synthetic method may be applicable to the synthesis of other azaacenes.
- Lunchev, Andrey V.,Morris, Samuel A.,Ganguly, Rakesh,Grimsdale, Andrew C.
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p. 1819 - 1823
(2019/01/14)
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- Studies on the synthesis and properties of polynitro compounds based on esteryl backbones
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Four esteryl-bridged energetic compounds have been derived from 2,2,2-trinitroethanol with polynitro benzoic acids and characterized via IR, multinuclear NMR spectroscopy, elemental analysis and differential scanning calorimetry (DSC). The structures of 2,2,2-trinitroethyl-2,4,6-trinitrobenzoate (5), bis(2,2,2-trinitroethyl)-4,6-dinitroisophthalate (6), bis(2,2,2-trinitroethyl)-2,5-dinitroterephthalate (7) and bis(2,2,2-trinitroethyl)-2,4,6-trinitroisophthalate (8) were further confirmed by X-ray diffraction studies, which show favorable densities (1.804-1.850 g cm-3). Interestingly, most of the polynitro esters decompose at temperatures over 180 °C (except for 6: 171.6 °C), which thus exhibit good thermal stability. In addition, performance calculations give detonation pressures and velocities for the ester derivatives in the range of 30.4-32.9 GPa and 8267-8559 m s-1, respectively. The esteryl-bridged compounds possess acceptable impact sensitivities (14-22 J), friction sensitivities (240-360 N), and electrostatic sensitivities (0.20-0.32 J). These values indicate that polynitro esters can be candidates as promising energetic materials.
- Xu, Zhen,Yang, Hongwei,Cheng, Guangbin
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p. 9936 - 9944
(2016/12/07)
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- Aromatic oligoureas: Enforced folding and assisted cyclization
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Aromatic oligoureas are forced into well-defined conformation by incorporated intramolecular hydrogen bonds. Shape-persistent tetraureas macrocycles were obtained in a one-step [2 + 2] reaction in good yields.
- Zhang, Aimin,Han, Yaohua,Yamato, Kazuhiro,Zeng, Xiao Cheng,Gong, Bing
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p. 803 - 806
(2007/10/03)
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- Overcoming regioselectivity issues inherent in bis-Troeger's base preparation
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(Figure Presented) Bis-Troeger's base derivatives are a new family of molecular tweezers. A major drawback to their study is a lack of commercially available precursors, ortho-nitrocarboxylic acids. A reverse synthetic strategy starting from known dinitrodicarboxylic acids, which circumvents this problem, is presented. Via this methodology regioisomeric bis-TB derivatives can be prepared selectively, using only common aromatic amines that are typically commercially available.
- Havlik, Martin,Kral, Vladimir,Dolensky, Bohumil
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p. 4867 - 4870
(2007/10/03)
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