Constructing a graphene-like structure to lower friction sensitivity: Ag(i) complexes based on furan-2,5-dicarbohydrazide

Abstract

In the field of energetic materials, high sensitivity has always been one of the obstacles restricting the practical application of energetic materials. In order to meet the practical application requirements, there are various methods to lower sensitivity, among which doping multilayer graphene is one of the important methods to reduce the friction sensitivity of energetic compounds in recent years. A multilayer graphene structure has the obvious characteristics of a weak interaction between layers and a strong interaction between atoms in layers. This special structure makes it slip between layers when it encounters friction, thus reducing the heat conduction efficiency and hindering the generation of hot spots, and finally shows the effect of lowering friction sensitivity on a macro level. Inspired by this mechanism, we designed and synthesized a ligand furan-2,5-dicarbohydrazide (FDCA) and its Ag(I)-based metal complex ([Ag(FDCA)ClO₄]_n, ECP-1) with a graphene-like structure. The structure of the product was confirmed using single-crystal X-ray diffraction, infrared spectroscopy and elemental analysis. ECP-1 exhibits excellent explosion performance and initiation ability, but also shows a low friction sensitivity (FS = 84 N), which is in sharp contrast with a sensitive impact sensitivity (IS = 4 J). The simple preparation method and unique structure enrich research on lowering the mechanical sensitivity of primary explosives.