| Abstract
| - 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 CuII 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.
- H2bta is a bidentate chelating ligand with multi-proton donor sites. In this context, the H2bta/(NH4)2[Cu(NH3)6] reaction results in the formation of three new compounds with doubly deprotonated bta as a ligand. The crystal structures of two new compounds are discussed with respect to the coordination mode of bta, which mediates weak superexchange interactions between the adjacent magnetic transition-metal CuII cations, resulting from 1D copper chains over a hidden azide end-to-end bridge. Initial safety tests as well thermodynamic aspects are discussed.
|
