- Buffer Catalysis in the Hydrolysis of Picrylimidazole
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The kinetics of the hydrolysis of picrylimidazole (S) was studied between pH 0.47 and 10.6 with different buffers at various concentrations.The reaction is strongly catalyzed by carboxylate and phosphate ions.Imidazole also catalyzes the reaction although it is a weak catalyst.At pH below 4 S starts to be protonated and the buffer-independent rate constant increases until it reaches a plateau.Rate constants for the base-catalyzed pathway are separated into the contribution of the rate for the protonated and unprotonated substrates.The Broensted plots give slopes of 0.5 and 0.58, respectively.The mechanism of catalysis is discussed.
- Rossi, Rite H. de,Vargas, Elba B. de
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- Thermal characterization and theoretical and experimental comparison of picryl chloride derivatives of heterocyclic energetic compounds
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There were 10 nitrogen-rich energetic compounds prepared by the reaction of 2,4,6-trinitrochlorobenzen (picryl chloride) with pyrazole, 1,2,4-triazole, imidazole, 3-aminopyrazole, 3-nitropyrazole, 3-amino-1,2,4-triazole, 3-nitro-1,2,4-triazole, 3,5-diamino-1,2,4-triazole and guanidine. These compounds were characterized with IR spectra, elemental analysis and 1H NMR and 13C NMR methods. They were also examined with thermogravimetry and differential thermal analyses. The heat generated after the explosion was measured by the use of differential scanning calorimetry. The formation enthalpies of some of the products synthesized were determined by the use of Gaussian 09 software, and probable products were estimated from the data reported in the literature. Finally, theoretical explosion energies of these compounds were calculated using the theoretical formation enthalpies and compared with experimental data.
- Yigiter, Aynur Ozler,Atakol, Melike Kundurac?,Levent Aksu,Atakol, Orhan
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p. 2199 - 2213
(2017/02/26)
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- Energetic polyazole polynitrobenzenes and their coordination complexes
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New energetic polyazole polynitrobenzenes exhibit high heats of formation and thermal stabilities, and react as useful ligands with silver dinitramide to give an energetic coordination complex.
- Zeng, Zhuo,Guo, Yong,Twamley, Brendan,Shreeve, Jean'Ne M.
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supporting information; experimental part
p. 6014 - 6016
(2010/11/03)
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