Reinvestigating the synthesis and properties of high energetic MOFs based on 5,5′-bistetrazole-1,1′-diolate (BTO2−) and some transition metal cations (Pb2+, Cu2+ and Ag+)

Abstract

5,5′-Bistetrazole-1,1′-diole (H2BTO), as a high energetic compound, is the precursor for the synthesis of insensitive high explosive (TKX-50, ABTOX and …). It is also considered as an attracting high nitrogen content ligand to prepare high energetic MOFs. Herein, H2BTO has been synthesized following a four steps method from glyoxal with an overall yield of 68%. Then, MOFs based on this ligand and Pb2+, Cu2+, and Ag+ have been prepared via hydrothermal method in a cylindrical glass pressure vessel at 130 °C. ICP-AES analysis confirms the composition of the produced MOFs as [Pb(BTO)(H2O)2]n, [Cu(BTO)(H2O)2]n and [Ag(HBTO)]n that, compared to the ligand precursor (H2BTO), are more dense and thermal stable but are more sensitive toward impact. Among these three MOFs, [Cu(BTO)(H2O)2]n present promising sensitivity properties (friction sensitivity >360 N and impact sensitivity of 28 J).