title: BTA copper complexes.
abstract: Cupric oxide is one of the most important additives used (a) to catalyze decomposition reactions in gas generators to 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 Cu(2+) ions in aqueous ammonia solution with bis(tetrazolyl)amine (H(2)bta) was investigated. Depending on the reaction conditions three complexes were obtained: Cu(bta)(NH(3))(2) (1), Cu(bta)(NH(3))(2).H(2)O (2), and (NH(4))(2)Cu(bta)(2).2.5H(2)O (3). The crystal structures of 1 and 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 magnetic transition-metal Cu(II) cations. These antiferromagnetic interactions result from 1D copper chains over an hidden azide end-to-end bridge. Interestingly, the structural arrangement of 1 completely changes in the presence of crystal-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.
authors.affiliation: Department of Chemistry and Biochemistry, Ludwig-Maximilian University Munich, Germany.
authors.forename: Manfred
authors.initials: M
authors.lastname: Friedrich
authors.forename: Juan Carlos
authors.initials: JC
authors.lastname: Gálvez-Ruiz
authors.forename: Thomas M
authors.initials: TM
authors.lastname: Klapötke
authors.forename: Peter
authors.initials: P
authors.lastname: Mayer
authors.forename: Birgit
authors.initials: B
authors.lastname: Weber
authors.forename: Jan J
authors.initials: JJ
authors.lastname: Weigand