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    Wyświetlanie 1-6 z 6
    Tytuł:
    Preparation and Characterization of 1-(5-Azido-1H-1,2,4-triazol-3-yl)tetrazole
    Autorzy:
    Izsák, D.
    Klapötke, T. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/358367.pdf
    Data publikacji:
    2015
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    energetic materials
    heterocycles
    triazoles
    tetrazoles
    azides
    Opis:
    This study presents the preparation of 1-(5-azido-1H-1,2,4-triazol-3yl)tetrazole (5) from commercially available chemicals in a five step synthesis. The energetic title compound was comprehensively characterized by various means, including vibrational (IR, Raman) and multinuclear (1H, 13C, 14N, 15N) NMR spectroscopy, mass spectrometry and differential scanning calorimetry. The sensitivities towards various outer stimuli (impact, friction) were determined according to BAM standards. The enthalpy of formation was calculated at the CBS-4M level of theory.
    Źródło:
    Central European Journal of Energetic Materials; 2015, 12, 3; 403-416
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Novel High-Nitrogen Content Energetic Compounds with High Detonation and Combustion Performance for use in Plastic Bonded Explosives (PBXs) and Composite Solid Propellants
    Autorzy:
    Keshavarz, M. H.
    Abadi, Y. H.
    Esmaeilpour, K.
    Damiri, S.
    Oftadeh, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/358704.pdf
    Data publikacji:
    2018
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    tetrazoles derivatives
    detonation performance
    combustion performance
    sensitivity
    Opis:
    Five novel high-nitrogen content (N>50%) derivatives of tetrazole are introduced in the study reported here. The assessment of various properties of these compounds were performed, which include physicothermal properties (crystal density, condensed phase heat of formation, melting point, enthalpy of fusion and entropy of fusion), detonation performance (velocity and pressure of detonation, detonation temperature and power), sensitivity with respect to external stimuli (impact, shock, friction and electric spark) and combustion performance (specific impulse). The predicted results of these compounds are compared with dihydroxylammonium 5,5’-bistetrazole-1,1’-diolate (TKX-50) and octanitro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine (HMX) as a high performance ionic salt and a neutral explosive, respectively. The novel energetic compounds were found to have higher detonation and combustion performance than either TKX-50 or HMX. The new explosives are therefore good candidates to obtain high detonation and combustion performance in plastic bonded explosives (PBXs) and composite solid propellants, respectively.
    Źródło:
    Central European Journal of Energetic Materials; 2018, 15, 2; 364-375
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hydrazinium 5-Aminotetrazolate: an Insensitive Energetic Material Containing 83.72% Nitrogen
    Autorzy:
    Fischer, N.
    Klapötke, T. M.
    Scheutzow, S.
    Stierstorfer, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/358539.pdf
    Data publikacji:
    2008
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    hydrazines
    tetrazoles
    crystal structure
    energetic materials
    sensitivities
    Opis:
    Hydrazinium 5-aminotetrazolate (2) was synthesized via two facile routes. Both the reaction of 5-amino-1H-tetrazole (1) with hydrazine hydrate in aqueous solution and the reaction of 1 with diluted hydrazine solution in THF yield 2 in excellent purities and yields. 2 was characterized comprehensively by X-ray diffraction, IR, Raman and multinuclear NMR spectroscopy, mass spectrometry, elemental analysis and differential scanning calorimetry. The heat of formation was calculated (CMS-4M) using the atomization method to be 373 kJ mol-1. With this value and the X-ray density several detonation parameter (heats of explosion, detonation pressure, detonation velocity, explosion temperature) were calculated with the EXPLO5 computer software. An incredible high value (9516 m s-1) was obtained for the detonation velocity. Therefore experimentally tests to determine the velocity of detonation were performed. In addition the use of 2 in solid propellant compositions was calculated and tested in combination with oxidizers, e.g. ammonium dinitramide. Lastly the sensitivities towards impact, friction and electrostatic discharge were determined with the BAM drophammer, friction tester and an ESD machine.
    Źródło:
    Central European Journal of Energetic Materials; 2008, 5, 3-4; 3-18
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zastosowania biologiczne tetrazoli i ich pochodnych
    Biological applications of tetrazoles and their derivatives
    Autorzy:
    Olszewska, A.
    Strzempek, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/172586.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    tetrazol
    pochodne tetrazoli
    zastosowania biologiczne
    tetrazole
    tetrazoles derivatives
    biological applications
    Opis:
    Due to the wide range of applications of tetrazoles, in recent years the number of publications and patents describing the synthesis, structural and physicochemical studies of compounds that contain tetrazole fragments in their structure has increased significantly [1]. Tetrazoles are unique compounds containing some of the most electron deficient aromatic rings so that they have one of the highest electron affinity [3]. They also have a whole range of coordination possibilities from simple monodentate ligands to complex polymer systems in which several of nitrogen atoms per tetrazole molecule are involved in the metal coordination. The presence of the metal allows a much wider application, combining the simple geometries and properties of organic compounds with the wealth of structure and properties of the metals. The discussed heterocyclic compounds are not only the most modern high energetic materials for military purposes [5], but also fungicides [6], herbicides [7], a promising component in many modern therapies [8] and drugs [11] (e.g. derivatives of indomethacin, drug for arthritis [1]). One of the most important fields in which tetrazoles and their derivatives are widely used is medicinal chemistry. Because of their high physiological activity and low toxicity, they are versatile in both biochemical and pharmaceutical applications [9]. Moreover, different compounds containing tetrazoles have antimicrobial (Fig. 1) [11, 13–17], antifungal (Fig. 2) [18–20], antiparasitic (Fig. 13–16) [34–36], antivirus (Fig. 17–19) [37–41], analgesic and anti-inflammatory (Fig. 3, 4) [17, 21–24], anti-epileptic, anticonvulsant (Fig. 10–13) [30–33], antihypertensive, antitumor (Fig. 5–9) [25–29], antidiabetic and other properties [12]. This article is a review of the selected tetrazoles and their derivatives in terms of their biological applications.
    Źródło:
    Wiadomości Chemiczne; 2018, 72, 3-4; 207-228
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Oxygen-containing Tetrazole Salts of 3-Hydrazino-4-amino-1,2,4-triazole (HATr): Nitrogen-rich Ionic Materials with High Thermal Stability
    Autorzy:
    Wu, J.-T.
    Zhang, J.-G.
    Yin, X.
    Li, T.
    Wu, L.
    Zhang, Z.-B.
    Powiązania:
    https://bibliotekanauki.pl/articles/358927.pdf
    Data publikacji:
    2017
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    energetic salts
    thermal stability
    oxygen-containing tetrazoles
    3-hydrazino-4-amino-1,2,4-triazole
    Opis:
    Energetic salts of doubly-protonated 3-hydrazino-4-amino-1,2,4-triazole (2-4), and mono-protonated 3-hydrazino-4-amino-1,2,4-triazole (5-7), have been prepared in high yields from the corresponding oxygen-containing tetrazoles by (i) reaction of free acids and neutral 3-hydrazino-4-amino-1,2,4-triazole, or (ii) metathesis reactions of 3-hydrazinium-4-amino-1H-1,2,4-triazolium di-chloride with the silver salts of the corresponding oxygen-containing tetrazoles. All of these energetic salts were fully characterized by single-crystal X-ray diffraction, FT-IR and DSC measurements. All of the structures are dominated by extensive hydrogen bonds due to amino groups, hydrazino groups and oxygen atoms in the molecules. These salts exhibit good thermal stability, especially the salt 3-hydrazinium-4-amino-1H-1,2,4-triazolium 1H,1’H-5,5’-bitetrazole-1,1’-diolate (4), which exhibits a measured onset of decomposition temperature of 237 °C. Quantum chemical calculations, carried out using the Gaussian 03 suite of programs and based on the experimental densities were used to calculate the detonation pressures and velocities of all of the salts.
    Źródło:
    Central European Journal of Energetic Materials; 2017, 14, 1; 217-232
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mixtures of Phase-stabilized Ammonium Nitrate and Tetrazoles as New Gas-generating Agent Compositions
    Autorzy:
    Hasue, K.
    Yoshitake, K.
    Matsukawa, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/358525.pdf
    Data publikacji:
    2016
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    potassium-nitrate-phase-stabilized ammonium nitrate(V)
    tetrazoles
    gas-generating agents
    burning rate
    4 L tank test
    Opis:
    New gas-generating agents for air bags have been investigated. Ammonium nitrate does not give off harmful gases nor leave solid residues but goes through contraction and expansion during a series of phase transitions that cause structural damage within the material. In this study, potassium-nitrate-phase-stabilized ammonium nitrate (PSAN) was prepared by a nonhazardous aqueous method. Ammonium nitrate-based propellants have low burning rates. Tetrazoles were selected as they have a large heat of formation and can be used as fuel components for ammonium nitrate-based gas-generating agents. A number of different experiments were conducted on the novel tetrazole/PSAN mixtures in order to evaluate their application as gas-generating agents.
    Źródło:
    Central European Journal of Energetic Materials; 2016, 13, 1; 247-260
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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