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The coordination compound (5-cyanotetrazolato-N2)pentaamminecobalt( I I I) perchlorate has been developed for explosive applications. Chemical studies applying to this development are reviewed. These include establishment of a commercial synthetic procedure, determination of structure, characterization of impurities, and development of analytical techniques for chemical analysis. Chemical reaction paths leading to impurity formation and associated with thermal decomposition are examined. The status of an ongoing effort to define relationships between chemical structure and explosive properties is presented.The Fundamental Research on Explosives (FRE) program is a multidisciplinary, Laboratory-wide fundamental research effort whose aim is to gain a detailed molecular-level understanding of the energetics of liquid nitric oxide decomposition that supports the phenomenon of detonation in that system. In the FRE program we are interested in the details of the acquisition and maintenance of steady detonation in liquid nitric oxide and in how this steady condition compares to the existing (Chapman-Jouguet) theory of steady detonation.