Crystallographic study of the energetic salt 1,2,4-triazolium perchlorate.

The molecular and crystal structure of 1H-1,2,4-triazolium perchlorate, C2H4N3+·ClO4-, was determined as detailed crystallographic data had not been available previously. The structure has monoclinic (P21/m) symmetry. It is of interest in the field of energetic compounds because nitrogen-rich azoles are the backbone of high-density energetic compounds, and salt-based energetic materials can exhibit preferential energy-release behaviour. The bond angles of the 1,2,4-triazolium cation in this study were similar to those of a cationic triazole ring reported previously and were different from those of the neutral triazole ring. This study contributes to the available data that can be used to analyse the relationship between the structures and properties of energetic materials.

Crystal structure of benzyl 2-naphthyl ether, a sensitiser for thermal paper.

The title compound [systematic name: 2-(benz-yloxy)naphthalene], C17H14O, which is used as a sensitiser for thermal paper, has a twisted conformation with a dihedral angle of 48.71 (12)° between the phenyl ring and the naphthyl ring system. In the crystal, one mol-ecule inter-acts with six neighbouring mol-ecules via inter-molecular C-H⋯π inter-actions to form a herringbone mol-ecular arrangement.