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

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• 作者：Jizhen Li^a ; ^b ; Chunyan Wang^a ; Xiaoni Gao^a ; Fengqi Zhao^b ; Kai Zhao^a ; Xuezhong Fan^b ; Guofang Zhang^a ; ^{gfzhang@snnu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Weiqiang Zhang^a ; Ziwei Gao^a
• 关键词：5-Ferrocenyl-1H-tetrazole ; Alkaline salt ; Alkaline earth salt ; Combustion catalytic activity ; Thermal decomposition
• 刊名：Polyhedron
• 出版年：2016
• 出版时间：26 February 2016
• 年：2016
• 卷：106
• 期：Complete
• 页码：58-64
• 全文大小：2029 K

文摘

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.