Abstract
Context
Various 7H,7′H-[6,6′-bi[1,2,4]triazolo[4,3-b][1,2,4]triazole]-3,3′,7,7′-tetramine (A) based nitrogen-rich energetic salts were designed and their properties explored. All energetic salts possess relatively high nitrogen content (> 48%), positive heats of formation (> 429 kJ/mol) and stability owing to a significant contribution from fused backbone. The cationic component shows a very high heat of formation (2516 kJ/mol); therefore, it is highly suitable for enthalpy enhancement in new energetic salts. The cation was paired with the energetic anions nitrate (NO3−), perchlorate (ClO4−), dinitromethanide (CH(NO2)2−), trinitromethanide (C(NO2)3−), nitroamide (NHNO2−), and dinitroamide (N(NO2)2−) to improve oxygen balance and detonation performance. Designed salts show moderate detonation velocities (7.9–8.7 km/s) and pressures (23.8 − 33.1 GPa). The distribution of frontier molecular orbitals, molecular electrostatic surface potentials, QTAIM topological properties, and noncovalent interactions of designed salts were simulated to understand the electronic structures, charge distribution in molecules, hydrogen bonding, and other nonbond interactions. The predicted safety factor (SF) and impact sensitivity (H50) of designed salts suggest their insensitivity to mechanical stimuli. This work explored the 7H,7′H-[6,6′-bi[1,2,4]triazolo[4,3-b][1,2,4]triazole]-3,3′,7,7′-tetramine as a suitable cationic component which could be promising and serve exemplarily in energetic materials.
Methods
The optimization and energy calculations of all the designed compounds were carried out at the B3LYP/6–311 + + G(d,p) and M06-2X/def2-TZVPP levels, utilizing the Gaussian software package. The molecular surface electrostatic potential, quantum theory of atoms in molecules (QTAIM), reduced density gradient (RDG), and noncovalent interaction (NCI) analysis were performed by employing Multiwfn software. The EXPLO5 (v 7.01) thermochemical code and PILEM web application were used to predict the detonation properties.
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Acknowledgements
The authors declare that no funds, grants, or other support were received during the preparation of this manuscript. Rimpi thank UGC-CSIR, Human Resource Development Group, Government of India for the Research Fellowship. Kalpana thanks the Council of Scientific &; Industrial Research (CSIR), India, for providing the Junior Research Fellowship (CSIR-HRDG Ref. No.: Sept/06/22(i)EU-V).
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Rimpi Devi: conceptualization, methodology, programming, validation, writing—original draft. Kalpana Sharma: conceptualization, investigation, writing—original draft. Vikas D. Ghule: investigation, methodology, funding acquisition, supervision, project administration, software, writing—original draft, writing—review and editing. Srinivas Dharavath: funding acquisition, software, writing—review and editing. All authors read and approved the final manuscript.
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Devi, R., Sharma, K., Ghule, V.D. et al. Bistriazolotriazole-tetramine: commendable energetic moiety and cation. J Mol Model 30, 98 (2024). https://doi.org/10.1007/s00894-024-05892-6
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DOI: https://doi.org/10.1007/s00894-024-05892-6