中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
1,1-二甲基-2-(2,4,6-三硝基苯基)肼 | 2,2-dimethyl-1-(2,4,6-trinitrophenyl)hydrazine | 62054-70-0 | C8H9N5O6 | 271.189 |
1,2-二(2,4,6-三硝基苯基)肼 | 2,2',4,4',6,6'-hexanitrohydrazobenzene | 68683-32-9 | C12H6N8O12 | 454.226 |
—— | pyruvaldehyde bis-(2,4-dinitro-phenylhydrazone) | 1107-69-3 | C15H12N8O8 | 432.309 |
2-叠氮基-1,3,5-三硝基苯 | 2-azido-1,3,5-trinitro-benzene | 1600-31-3 | C6H2N6O6 | 254.118 |
(E)-二(2,4,6-三硝基苯基)二氮烯 | 2.2'.4.4'.6.6'-Hexanitroazobenzol | 19159-68-3 | C12H4N8O12 | 452.21 |
Various physical measurements and quantum-mechanical computations to characterize molecular 2-propanone(2,4,6-trinitrophenyl)hydrazone, alias acetone-picrylhydrazine (AH), are reported, including an X-ray diffraction structural determination, an 1H and 13C NMR study of its internal hindered reorientation, and a theoretical (SCF-MO) interpretation of these observations. The structure of AH was determined by X-ray crystallography. The space group is Pbar over 1, with a = 10.1768(9) Å, b = 7.7968(18) Å, c = 8.0018(5) Å, α = 92.102(6)°, β = 99.919(7)°, γ = 105.926(6)°, Z = 2, wR2(F2) = 0.1995 based on all 2748 unique reflections. The (picryl) proton NMR thermal work yielded a Gibbs activation energy ΔG = 46.9 ± 0.4 kJ mol-1 in acetone-d6 and 48.1 ± 0.2 kJ mol-1 in chloroform-d, whereas 13C NMR (two pairs in the picryl ring) yielded 46.6 ± 1.0 and 46.4 ± 1.0 kJ mol-1 in acetone-d6. The SCF-MO computations yielded a detailed model of the conformerization path. Various model conformations and tautomers of AH have been considered, as has removal of H+ or of H0 from its hydrazinic linkage.Key words: dynamic NMR, picrylhydrazone, hindered rotation, activation parameters, SCF-MO model.