557-30-2Relevant articles and documents
Preparation, crystal structure and properties of a new crystal form of diammonium 5,5′-bistetrazole-1,1′-diolate
Wang, Xiaojun,Jin, Shaohua,Zhang, Chunyuan,Li, Lijie,Chen, Shusen,Shu, Qinghai
, p. 1229 - 1234 (2015)
A new crystal form of diammonium 5,5′-bistetrazole-1,1′-diolate (1) was prepared by two novel methods and fully characterized by using IR, NMR spectroscopy, elementary analysis, single crystal X-ray crystallography and thermal gravity/differential thermal analysis (TG/DTA). Crystalline 1 was found as monoclinic and space group of P21/c (14). The TG/DTA analysis showed that the decomposition temperature of 1 was 287.8°C with a mass loss of 91.2% in the range of 220-300°C at a heating rate of 5°C/min. The sensitivities test towards impact, friction of 1 indicated that 1 has much lower sensitivities than those of RDX/HMX and is comparable to those of TNT, which suggested that 1 could be used as a good candidate of new insensitive energetic compound. A new crystal form of diammonium 5,5′-bistetrazole-1,1′-diolate (1) was prepared by two different novel methods and found as monoclinic and space group of P21/c (14). The thermal decomposition analysis and sensitivities test towards impact, friction of 1 indicated that 1 has much lower sensitivities than those of RDX/HMX and comparable to those of TNT, which suggested that 1 could be used as a good candidate of new insensitive energetic compound.
High-Throughput Screening of Earth-Abundant Water Reduction Catalysts toward Photocatalytic Hydrogen Evolution
Motz, Rachel N.,Lopato, Eric M.,Connell, Timothy U.,Bernhard, Stefan
supporting information, p. 774 - 781 (2021/02/05)
Noble-metal photosensitizers and water reduction co-catalysts (WRCs) still present the highest activity in homogeneous photocatalytic hydrogen production. The search for earth-abundant alternatives is usually limited by the time required to screen new catalyst combinations; however, here, we utilize newly designed and developed high-throughput photoreactors for the parallel synthesis of novel WRCs and colorimetric screening of hydrogen evolution. This unique approach allowed rapid optimization of photocatalytic water reduction using the organic photosensitizer Eosin Y and the archetypal cobaloxime WRC [Co(GL1)2pyCl], where GL1 is dimethylglyoxime and py is pyridine. Subsequent combinatorial synthesis generated 646 unique cobalt complexes of the type [Co(LL)2pyCl], where LL is a bidentate ligand, that identified promising new WRC candidates for hydrogen production. Density functional theory (DFT) calculations performed on such cobaloxime derivative complexes demonstrated that reactivity depends on hydride affinity. Alkyl-substituted glyoximes were necessary for hydrogen production and showed increased activity when paired with ligands containing strong hydrogen-bond donors.
Synthesis method of 2-pyrazine carboxylic ester compound
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Paragraph 0038; 0045-0047, (2021/04/14)
The invention provides a synthetic method of a 2-pyrazine carboxylic ester compound. The synthesis method comprises the following steps: S1, carrying out addition reaction on a compound 1 and glyoxal dioxime under the action of a Lewis acid catalyst to obtain an intermediate 1; and step S2, carrying out first dehydration reaction on the intermediate 1 to obtain the 2-pyrazine carboxylic ester compound, wherein the structural general formulas of the compound 1, the intermediate 1 and the 2-pyrazine carboxylic ester compound are sequentially shown in the specification, R1 being a C1-C15 substituted or unsubstituted alkyl group, and R2 being a C1-C10 alkyl group. The preparation cost (or commercially available price) of the initial raw material compound 1 adopted by the invention is generally far lower than that of a trifluoropyruvate methyl ester compound. Compared with the traditional preparation method of 3-trifluoromethyl-2-methyl pyrazinecarboxylate, the method has the advantages of mild reaction conditions, simple operation and wide raw material sources, avoids the use of an expensive coupling catalyst, and greatly reduces the cost.
