title: Cocrystallization of photosensitive energetic copper(II) perchlorate complexes with the nitrogen-rich ligand 1,2-Di(1H-tetrazol-5-yl)ethane.
abstract: Two recently introduced concepts in the design of new energetic materials, namely complexation and cocrystallization, have been applied in the synthesis and characterization of the energetic copper(II) compound "[Cu(dt-5-e)2(H2O)](ClO4)2," which consists of two different complex cations and can be described as a model energetic ionic cocrystal. The presence of both the N-rich 1,2-di(1H-tetrazol-5-yl)ethane ligand and oxidizing perchlorate counterion results in a new type of energetic material. The ionic complex cocrystal consists of a mononuclear and a trinuclear complex unit. It can be obtained by precipitation from perchloric acid or by dehydration of the related mononuclear coordination compound [Cu(dt-5-e)2(H2O)2](ClO4)2·2H2O at 70 °C in the solid state. The transformation starting at 60 °C was monitored by X-ray powder diffraction and thermal analysis. The energetic ionic cocrystal was shown to be a new primary explosive suitable for laser ignition. The different coordination spheres within the ionic cocrystal (octahedral and square pyramidal) were shown by UV/vis/NIR spectroscopy to result in excellent light absorption.
authors.affiliation: Department of Chemistry, Energetic Materials Research, Ludwig-Maximilian University of Munich , Butenandtstr. 5-13, 81377 Munich, Germany.
authors.forename: Jürgen
authors.initials: J
authors.lastname: Evers
authors.forename: Ivan
authors.initials: I
authors.lastname: Gospodinov
authors.forename: Manuel
authors.initials: M
authors.lastname: Joas
authors.forename: Thomas M
authors.initials: TM
authors.lastname: Klapötke
authors.forename: Jörg
authors.initials: J
authors.lastname: Stierstorfer