BTA Copper Complexes

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• 作者：Manfred Friedrich ; Juan Carlos Gá ; lvez-Ruiz ; Thomas M. Klapö ; tke ; Peter Mayer ; Birgit Weber ; and Jan J. Weigand
• 刊名：Inorganic Chemistry
• 出版年：2005
• 出版时间：October 31, 2005
• 年：2005
• 卷：44
• 期：22
• 页码：8044 - 8052
• 全文大小：212K
• 年卷期：v.44,no.22(October 31, 2005)
• ISSN：1520-510X

文摘

Cupric oxide is one of the most important additives used (a) to catalyze decomposition reactions in gas generatorsto obtain cooler reaction gases, (b) as burning enhancer for ammonium perchlorate-based composite propellants,and (c) as coloring agent in pyrotechnics. In this context, the reaction of Cu²⁺ ions in aqueous ammonia solutionwith bis(tetrazolyl)amine (H₂bta) was investigated. Depending on the reaction conditions three complexes wereobtained: Cu(bta)(NH₃)₂ (1), Cu(bta)(NH₃)₂·H₂O (2), and (NH₄)₂Cu(bta)₂·2.5H₂O (3). The crystal structures of 1and 2 are discussed with respect to the coordination mode of the dianion of N,N-bis(1(2)H-tetrazol-5-yl)-amine(bta), which mediates in the case of 1 and 2 weak superexchange interactions between the adjacent magnetictransition-metal Cu^II cations. These antiferromagnetic interactions result from 1D copper chains over an hiddenazide end-to-end bridge. Interestingly, the structural arrangement of 1 completely changes in the presence ofcrystal-bound water. Moreover, some physicochemical properties (e.g., heat of formation, friction, and impact sensitivity,DSC) of these complexes with respect to high-energetic materials are discussed.