1
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Vaddypally S, Byrne AN, Goldsmith CF, Zdilla MJ, Kiselev VG. Metal-Free Reversible Double Cyclization of Cyanuric Diazide to an Asymmetric Bitetrazolate via Cleavage of the Six-Membered Aromatic Ring. Inorg Chem 2024; 63:2322-2326. [PMID: 38262914 DOI: 10.1021/acs.inorgchem.3c04338] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2024]
Abstract
Crystallization of the reaction mixture of 2-amino-4,6-diazido-1,3,5-triazine and excess tert-butylamine results in the isolation of tert-butylammonium N,N-[1'H-(1,5'-bitetrazol)-5-yl]cyanamidate, suggesting a complex decyclization/cyclization rearrangement involving breakage of the six-membered aromatic ring and the formation of two new five-membered azole rings mediated by deprotonation of the precursor by the amine. The addition of tert-butylamine to 2-amino-4,6-diazido-1,3,5-triazine gives spectroscopic indication of thermodynamically unfavorable reactivity in low-dielectric solvents, and high-level quantum chemical computations also suggest its formation to be unfavorable. A computed interconversion pathway describes the likely reaction mechanism and supports the general thermodynamic unfavorability of the reaction and the requirement for a high-dielectric environment to template formation of the ionic product and its trapping by crystallization.
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Affiliation(s)
- Shivaiah Vaddypally
- Department of Chemistry, Temple University, 1901 North 13th Street, Philadelphia, Pennsylvania 19122, United States
| | - Alex N Byrne
- Department of Chemistry, Temple University, 1901 North 13th Street, Philadelphia, Pennsylvania 19122, United States
| | - C Franklin Goldsmith
- School of Engineering, Brown University, 184 Hope Street, Providence, Rhode Island 02912, United States
| | - Michael J Zdilla
- Department of Chemistry, Temple University, 1901 North 13th Street, Philadelphia, Pennsylvania 19122, United States
| | - Vitaly G Kiselev
- School of Engineering, Brown University, 184 Hope Street, Providence, Rhode Island 02912, United States
- Novosibirsk State University, 1 Pirogova Street, 630090 Novosibirsk, Russia
- Institute of Chemical Kinetics and Combustion, Siberian Branch of the Russian Academy of Sciences, 3 Institutskaya Street, 630090 Novosibirsk, Russia
- Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences, 4 Kosygina Street, 119991 Moscow, Russia
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2
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Jia MX, Wang QD, Ren XF, Kang GJ. Benchmarking Composite Methods for Thermodynamic Properties of Nitro, Nitrite, and Nitrate Species Relevant to Energetic Materials. Chem Phys Lett 2023. [DOI: 10.1016/j.cplett.2023.140360] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/11/2023]
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3
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Energetic [1,2,5]oxadiazolo [2,3- a]pyrimidin-8-ium Perchlorates: Synthesis and Characterization. Molecules 2022; 27:molecules27238443. [PMID: 36500539 PMCID: PMC9740163 DOI: 10.3390/molecules27238443] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2022] [Revised: 11/19/2022] [Accepted: 11/25/2022] [Indexed: 12/07/2022] Open
Abstract
A convenient method to access the above perchlorates has been developed, based on the cyclocondensation of 3-aminofurazans with 1,3-diketones in the presence of HClO4. All compounds were fully characterized by multinuclear NMR spectroscopy and X-ray crystal structure determinations. Initial safety testing (impact and friction sensitivity) and thermal stability measurements (DSC/DTA) were also carried out. Energetic performance was calculated by using the PILEM code based on calculated enthalpies of formation and experimental densities at r.t. These salts exhibit excellent burn rates and combustion behavior and are promising ingredients for energetic materials.
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4
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Muravyev NV, Gorn MV, Melnikov IN, Monogarov KA, Korsunskii BL, Dalinger IL, Pivkina AN, Kiselev VG. Autocatalytic decomposition of energetic materials: interplay of theory and thermal analysis in the study of 5-amino-3,4-dinitropyrazole thermolysis. Phys Chem Chem Phys 2022; 24:16325-16342. [PMID: 35758846 DOI: 10.1039/d1cp04663b] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
A reliable kinetic description of the thermal stability of energetic materials (EM) is very important for safety and storage-related problems. Among other pertinent issues, autocatalysis very often complicates the decomposition kinetics of EM. In the present study, the kinetics and decomposition mechanism of a promising energetic compound, 5-amino-3,4-dinitro-1H-pyrazole (5-ADP) were studied using a set of complementary experimental (e.g., differential scanning calorimetry in the solid state, melt, and solution along with advanced thermokinetic models, accelerating rate calorimetry, and evolved gas analysis) and theoretical techniques (CCSD(T)-F12 and DLPNO-CCSD(T) predictive quantum chemical calculations). The experimental study revealed that the strong acceleration of the decomposition rate of 5-ADP is caused by two factors: the progressive liquefaction of the sample directly observed using in situ optical microscopy, and the autocatalysis by reaction products. For the first time, the processing of the non-isothermal data was performed with a formal Manelis-Dubovitsky kinetic model that accounts for both factors. With the aid of quantum chemical calculations, we have rationalized the autocatalysis present in the formal kinetic models at the molecular level. Theory revealed an unusual primary decomposition channel of 5-ADP, viz., the two subsequent sigmatropic H-shifts in the pyrazole ring followed by the C-NO2 bond scission yielding a pyrazolyl and nitrogen dioxide radicals as simple primary products. Moreover, we found the secondary reactions of the latter radical with the 5-ADP to be kinetically unimportant. On the contrary, the substituted pyrazolyl radical turned out to undergo a facile addition to 5-ADP, followed by a fast exothermic elimination of another ˙NO2 species. We believe the latter process to contribute remarkably to the observed autocatalytic behavior of 5-ADP. Most importantly, the calculations provide detailed mechanistic evidence complementing the thermoanalytical experiment and formal kinetic models.
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Affiliation(s)
- Nikita V Muravyev
- Semenov Federal Research Center for Chemical Physics RAS, 4 Kosygina Str., 119991 Moscow, Russia.
| | - Margarita V Gorn
- Novosibirsk State University, 1 Pirogova Str., 630090 Novosibirsk, Russia.,Institute of Chemical Kinetics and Combustion SB RAS, 3 Institutskaya Str., 630090 Novosibirsk, Russia
| | - Igor N Melnikov
- Semenov Federal Research Center for Chemical Physics RAS, 4 Kosygina Str., 119991 Moscow, Russia.
| | - Konstantin A Monogarov
- Semenov Federal Research Center for Chemical Physics RAS, 4 Kosygina Str., 119991 Moscow, Russia.
| | - Boris L Korsunskii
- Semenov Federal Research Center for Chemical Physics RAS, 4 Kosygina Str., 119991 Moscow, Russia.
| | - Igor L Dalinger
- Zelinsky Institute of Organic Chemistry RAS, 47 Leninsky Ave., 119991 Moscow, Russia
| | - Alla N Pivkina
- Semenov Federal Research Center for Chemical Physics RAS, 4 Kosygina Str., 119991 Moscow, Russia.
| | - Vitaly G Kiselev
- Semenov Federal Research Center for Chemical Physics RAS, 4 Kosygina Str., 119991 Moscow, Russia. .,Novosibirsk State University, 1 Pirogova Str., 630090 Novosibirsk, Russia.,Institute of Chemical Kinetics and Combustion SB RAS, 3 Institutskaya Str., 630090 Novosibirsk, Russia
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5
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Nhat PV, Si NT, Kiselev VG, Fielicke A, Pham HT, Nguyen MT. Unexpected structures of the Au 17 gold cluster: the stars are shining. Chem Commun (Camb) 2022; 58:5785-5788. [PMID: 35451431 DOI: 10.1039/d2cc00891b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The Au17 gold cluster was experimentally produced in the gas phase and characterized by its vibrational spectrum recorded using far-IR multiple photon dissociation (FIR-MPD) of Au17Kr. DFT and coupled-cluster theory PNO-LCCSD(T)-F12 computations reveal that, at odds with most previous reports, Au17 prefers two star-like forms derived from a pentaprism added by two extra Au atoms on both top and bottom surfaces of the pentaprism, along with five other Au atoms each attached on a lateral face. A good agreement between calculated and FIR-MPD spectra indicates a predominant presence of these star-like isomers. Stabilization of a star form arises from strong orbital interactions of an Au12 core with a five-Au-atom string.
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Affiliation(s)
- Pham Vu Nhat
- Department of Chemistry, Can Tho University, Can Tho, Vietnam
| | - Nguyen Thanh Si
- Department of Chemistry, Can Tho University, Can Tho, Vietnam
| | - Vitaly G Kiselev
- Novosibirsk State University, 1 Pirogova Str., 630090 Novosibirsk, Russia.,Institute of Chemical Kinetics and Combustion SB RAS, 3 Institutskaya Str., 630090 Novosibirsk, Russia
| | - André Fielicke
- Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
| | - Hung Tan Pham
- Department of Chemistry, KU Leuven, Celestijnenlaan 200F, 3001 Leuven, Belgium
| | - Minh Tho Nguyen
- Institute for Computational Science and Technology (ICST), Ho Chi Minh City, Vietnam.
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6
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Benz M, Klapötke TM, Stierstorfer J, Voggenreiter M. Synthesis and Characterization of Binary, Highly Endothermic, and Extremely Sensitive 2,2'-Azobis(5-azidotetrazole). J Am Chem Soc 2022; 144:6143-6147. [PMID: 35358389 DOI: 10.1021/jacs.2c00995] [Citation(s) in RCA: 22] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
2,2'-Azobis(5-azidotetrazole) (C2N16, 3), a highly energetic nitrogen-rich binary CN compound was obtained in a three-step synthesis through the formation of 5-azidotetrazole (1), subsequent amination using O-tosylhydroxylamine to give 2-amino-5-azidotetrazole (2), and oxidative azo coupling of 2 using tBuOCl as an oxidant in MeCN. A nitrogen:carbon ratio of 8:1, eight nitrogen atoms in a row, and a nitrogen content of over 90% was unknown for a binary heterocyclic compound until now. The successful isolation was confirmed through X-ray diffraction as well as by vibrational and 13C NMR spectroscopy. C2N16 can explode instantly and shows mechanical sensitivities far higher than quantitatively measurable. Nevertheless, it features interesting energetic performances, which were calculated using different quantum-chemical methods.
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Affiliation(s)
- Maximilian Benz
- Department of Chemistry, Ludwig-Maximilian University of Munich, Butenandtstr. 5-13(D), D-81377 Munich, Germany
| | - Thomas M Klapötke
- Department of Chemistry, Ludwig-Maximilian University of Munich, Butenandtstr. 5-13(D), D-81377 Munich, Germany
| | - Jörg Stierstorfer
- Department of Chemistry, Ludwig-Maximilian University of Munich, Butenandtstr. 5-13(D), D-81377 Munich, Germany
| | - Michael Voggenreiter
- Department of Chemistry, Ludwig-Maximilian University of Munich, Butenandtstr. 5-13(D), D-81377 Munich, Germany
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7
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Soto J, Algarra M, Peláez D. Nitrene formation is the first step of the thermal and photochemical decomposition reactions of organic azides. Phys Chem Chem Phys 2022; 24:5109-5115. [PMID: 35156109 DOI: 10.1039/d1cp05785e] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
In this work, the decomposition of a prototypical azide, isopropyl azide, both in the ground and excited states, has been investigated through the use of multiconfigurational CASSCF and MS-CASPT2 electronic structure approaches. Particular emphasis has been placed on the thermal reaction starting at the S0 ground state surface. It has been found that the azide thermally decomposes via a stepwise mechanism, whose rate-determining step is the formation of isopropyl nitrene, which is, in turn, the first step of the global mechanism. After that, the nitrene isomerizes to the corresponding imine derivative. Two routes are possible for such a decomposition: (i) a spin-allowed path involving a transition state; and (ii) a spin-forbidden one via a S0/T0 intersystem crossing. Both intermediates have been determined and characterised. Their associated relative energies have been found to be quite similar, 45.75 and 45.52 kcal mol-1, respectively. To complete this study, the kinetics of the singlet and triplet channels are modeled with the MESMER (Master Equation Solver for Multi-Energy Well Reactions) code by applying the RRKM and Landau-Zener (with WKB tunnelling correction) theories, respectively. It is found that the canonical rate-coefficients of the singlet path are 2-orders of magnitude higher than the rate-coefficients of the forbidden reaction. In addition, the concerted mechanism has been investigated that would lead to the formation of the imine derivative and nitrogen extrusion in the first step of the decomposition. After a careful analysis of CASSCF calculations with different active spaces and their comparison with single electronic configuration methods (MP2 and B3LYP), the concerted mechanism is discarded.
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Affiliation(s)
- Juan Soto
- Department of Physical Chemistry, Faculty of Science, University of Málaga, E-29071 Málaga, Spain.
| | - Manuel Algarra
- INAMAT2 Institute for Advanced Materials and Mathematics, Department of Sciences, Campus de Arrosadia, 31006 Pamplona, Spain
| | - Daniel Peláez
- Institut des Sciences Moléculaires d'Orsay (ISMO) - UMR 8214, Université Paris-Saclay, 91405 Orsay Cedex, Spain
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8
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Lei G, Zhong Y, Xu Y, Yang F, Bai J, Li Z, Zhang J, Zhang T. New Energetic Complexes as Catalysts for Ammonium Perchlorate Thermal Decomposition. CHINESE J CHEM 2021. [DOI: 10.1002/cjoc.202000672] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Guorong Lei
- State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology Beijing 100081 China
| | - Ye Zhong
- State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology Beijing 100081 China
| | - Yiqiang Xu
- State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology Beijing 100081 China
| | - Fan Yang
- The SWAT Unit of Taiyuan Public Security Bureau Taiyuan Shanxi 030021 China
| | - Jiandong Bai
- The SWAT Unit of Taiyuan Public Security Bureau Taiyuan Shanxi 030021 China
| | - Zhimin Li
- State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology Beijing 100081 China
| | | | - Tonglai Zhang
- State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology Beijing 100081 China
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9
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Muravyev NV, Monogarov KA, Melnikov IN, Pivkina AN, Kiselev VG. Learning to fly: thermochemistry of energetic materials by modified thermogravimetric analysis and highly accurate quantum chemical calculations. Phys Chem Chem Phys 2021; 23:15522-15542. [PMID: 34286759 DOI: 10.1039/d1cp02201f] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The standard state enthalpy of formation and the enthalpy of sublimation are essential thermochemical parameters determining the performance and application prospects of energetic materials (EM). Direct experimental measurements of these properties are complicated by low volatility and high heat release in bomb calorimetry experiments. As a result, the uncertainties in the reported enthalpies of formation for a number of even well-known CHNO-containing compounds might amount up to tens kJ mol-1, while for some novel high-nitrogen molecules they reach even hundreds of kJ mol-1. The present study reports a facile approach to determining the solid-state formation enthalpies comprised of complementary high-level quantum chemical calculations of the gas-phase thermochemistry and advanced thermal analysis techniques yielding sublimation enthalpies. The thermogravimetric procedure for the measurement of sublimation enthalpy was modified by using low external pressures (down to 0.2 Pa). This allows for observing sublimation/vaporization instead of thermal decomposition of the compounds studied. Extensive benchmarking on nonenergetic and energetic compounds reveals the average and maximal absolute errors of the sublimation enthalpies of 3.3 and 11.0 kJ mol-1, respectively. The comparison of the results with those obtained from the widely used Trouton-Williams empirical equation shows that the latter underestimates the sublimation enthalpy up to 140 kJ mol-1. Therefore, we performed a reparametrization of the latter equation with simple chemical descriptors that reduces the mean error down to 30 kJ mol-1. Highly accurate multi-level procedures W2-F12 and/or W1-F12 in conjunction with the atomization energy approach were used to calculate theoretically the gas-phase formation enthalpies. In several cases, the DLPNO-CCSD(T) enthalpies of isodesmic reactions were also employed to obtain the gas-phase thermochemistry for medium-sized important EMs. Combining the obtained thermochemical properties, we determined the solid-state enthalpies of formation for nearly 60 species containing various important explosophoric groups, from common nitroaromatics, nitroethers, and nitramines to novel nitrogen-rich heterocyclic species (e.g., the derivatives of pyrazole, tetrazole, furoxan, etc.). The large-scale benchmarking against the available experimental solid-state enthalpies of formation yielded the maximal inaccuracy of the proposed method of 25 kJ mol-1.
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Affiliation(s)
- Nikita V Muravyev
- Semenov Federal Research Center for Chemical Physics, RAS, 4 Kosygina Str., 119991 Moscow, Russia.
| | - Konstantin A Monogarov
- Semenov Federal Research Center for Chemical Physics, RAS, 4 Kosygina Str., 119991 Moscow, Russia.
| | - Igor N Melnikov
- Semenov Federal Research Center for Chemical Physics, RAS, 4 Kosygina Str., 119991 Moscow, Russia.
| | - Alla N Pivkina
- Semenov Federal Research Center for Chemical Physics, RAS, 4 Kosygina Str., 119991 Moscow, Russia.
| | - Vitaly G Kiselev
- Semenov Federal Research Center for Chemical Physics, RAS, 4 Kosygina Str., 119991 Moscow, Russia. and Novosibirsk State University, 1 Pirogova Str., 630090 Novosibirsk, Russia and Institute of Chemical Kinetics and Combustion, SB RAS, 3 Institutskaya Str., 630090 Novosibirsk, Russia
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10
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Vaddypally S, Kiselev VG, Byrne AN, Goldsmith CF, Zdilla MJ. Transition-metal-mediated reduction and reversible double-cyclization of cyanuric triazide to an asymmetric bitetrazolate involving cleavage of the six-membered aromatic ring. Chem Sci 2020; 12:2268-2275. [PMID: 34163993 PMCID: PMC8179262 DOI: 10.1039/d0sc04949b] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Cyanuric triazide reacts with several transition metal precursors, extruding one equivalent of N2 and reducing the putative diazidotriazeneylnitrene species by two electrons, which rearranges to N-(1'H-[1,5'-bitetrazol]-5-yl)methanediiminate (biTzI2-) dianionic ligand, which ligates the metal and dimerizes, and is isolated from pyridine as [M(biTzI)]2Py6 (M = Mn, Fe, Zn, Cu, Ni). Reagent scope, product analysis, and quantum chemical calculations were combined to elucidate the mechanism of formation as a two-electron reduction preceding ligand rearrangement.
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Affiliation(s)
| | - Vitaly G Kiselev
- School of Engineering, Brown University 184 Hope St. Providence RI 02912 USA .,Novosibirsk State University 1 Pirogova Str. 630090 Novosibirsk Russia.,Institute of Chemical Kinetics and Combustion SB RAS 3 Institutskaya Str. 630090 Novosibirsk Russia.,Semenov Federal Research Center for Chemical Physics RAS 4 Kosygina Str. 119991 Moscow Russia
| | - Alex N Byrne
- Temple University 1901 N. 13th St. Philadelphia PA 19122 USA
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