In this short review, excerpts from the literature of azo-bridged triazoles (mainly 1,2,4-triazoles), some of their derivatives (chloromethyl, dinitro and trinitro pyrazole substituted ones, etc.) and some of their salts, have been presented focusing on the most recent investigations. These classes of compounds, known as high nitrogen compounds, are generally high energy density materials. Therefore, if available some of their ballistic properties were included. (C) 2015 China Ordnance Society. Production and hosting by Elsevier B.V. All rights reserved.