Alkaline and alkaline earth salts of 5-ferrocenyl-1H-tetrazole. Synthesis, characterization and catalytic effects on thermal decomposition of energetic compounds

Add time:09/30/2019    Source:sciencedirect.com

5-Ferrocenyl-1H-tetrazole (HFcTz) was deprotonated using alkali hydroxides or carbonates, yielding the corresponding metal salts [Li4(H2O)8(FcTz)4]·2CH3CN (1), NaFcTz (2), KFcTz (3), RbFcTz·H2O (4) and [Cs2(H2O)](FcTz)2 (5). Ca(FcTz)2·4H2O (6) was prepared by deprotonation of HFcTz with CaO under reflux. Sr(FcTz)2·4H2O (7) and [Ba(H2O)6](FcTz)2·H2O (8) were synthesized using HFcTz with Sr(OH)2·8H2O and Ba(OH)2·8H2O, respectively. All salts were characterized by FT-IR, UV−Vis and elementary analysis. The crystal structures of HFcTz, 1, 2, 5, 8 and [Ba2(H2O)8](FcTz)4·5H2O (8′) were additionally characterized by single crystal X-ray diffraction. TG and DSC analyses revealed that the new compounds have high thermal stability. Cyclic voltammetry investigations suggested that the compounds except 8 exhibit redox waves for the ferrocenyl groups and are considered as quasi-reversible/irreversible redox systems. Their catalytic effects on the thermal degradation of ammonium perchlorate (AP), 1,3,5-trinitro-1,3,5-triazacyclohexane (RDX) and 1,2,5,7-tetranitro-1,3,5,7-tetraazacyclooctane (HMX) were evaluated by DSC technique. All the new compounds exhibit high catalytic activity for the thermal decomposition of AP and their catalytic activity is higher than that of HFcTz. Most of the new compounds can also accelerate the thermal degradation of RDX.

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