- Synthesis, structure and magnetic properties of copper(II) azide
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A novel azide-bridged copper compound without an auxiliary ligand has been synthesized and characterized by single-crystal diffraction analysis. The compound consists of 1D double chains with end-on (EO) azide bridges. Furthermore, the neighboring chains are connected by weak coordination bonds, which leads to the formation of a 3D architecture. Low-temperature magnetic measurements reveal that antiferromagnetic interactions are dominant, with concomitant spin-canted antiferromagnetism.
- Shi, Taqing,Xu, Ye,Zou, Ya-Jing,Wang, Zhao-Xi
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- Refinement of Copper(II) Azide with 1-Alkyl-5H-tetrazoles: Adaptable Energetic Complexes
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A concept for stabilizing highly sensitive and explosive copper(II) azide with 1-N-substituted tetrazoles is described. It was possible to stabilize the system by the use of highly endothermic, nitrogen-rich ligands. The sensitivities of the resulting energetic copper coordination compounds can be tuned further by variation of the alkyl chain of the ligands and by phlegmatization of the complexes with classical additives during the synthesis. It is demonstrated, using the compound based on 1-methyl-5H-tetrazole ([Cu(N3)2(MTZ)], 1) that this class of complexes can be applied as a potential replacement for both lead azide (LA) and lead styphnate (LS). The complex was extensively investigated according to its chemical (elemental analysis, single-crystal and powder X-ray diffraction, IR spectroscopy, scanning electron microscopy) and physico-chemical properties (differential thermal analysis, sensitivities towards impact, friction, and electrostatic discharge) compared to pure copper(II) azide.
- Gruhne, Michael S.,Lommel, Marcus,Stierstorfer, J?rg,Szimhardt, Norbert,Wurzenberger, Maximilian H. H.
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- Reactions of acyl azides with secondary amines in the presence of copper(II) acetate
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The nucleophilic substitution of the azide group in acyl azides for secondary amines in the presence of copper(II) acetate was studied. The formation of the corresponding amides and copper(II) azide in the course of the reaction was observed. The shift of the absorption band of stretching vibrations of the azide group was observed in the IR spectra of the reaction products, which could be explained by the intermediate formation of a complex of acyl azide with the amine complex of copper(II) acetate and by its decomposition to form copper(II) azide and the corresponding amide. A blue-green color of the solution characteristic of copper(II) acetate changed in the course of the reaction to the brown color of a solution of copper(II) azide.
- Budruev,Sinjagina
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- Solvothermal synthesis of nanocrystalline copper nitride from an energetically unstable copper azide precursor
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Nonaqueous solvothermal chemical reactions have found extensive utility in the growth of inorganic non-oxide materials. This report describes the successful use of organic solvothermal environments to synthesize energetically unstable copper azide precursors that are then decomposed in situ to crystalline metastable copper nitride at temperatures below 200°C. A comparison of Cu3N products formed from nonpolar (toluene) and coordinating (THF) solvents is described. The cubic Cu3N products are nanocrystalline with aggregated particle-like extended structures and were characterized by X-ray diffraction, electron microscopy, IR spectroscopy, and mass spectrometry. The thermal stability and composition of Cu3N was examined by thermogravimetric analysis and bulk elemental analysis. The particle surfaces contain bound residual solvent species that can be removed by heating. The poorly coordinating solvent, toluene, lead to a more crystalline product containing less residual organic content. Benchtop reactions were performed to follow the temporal formation and decomposition of metal azide intermediates. These studies provided more detailed information on the progression of metal azide to metal nitride materials in a solvothermal environment.
- Choi, Jonglak,Gillan, Edward G.
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