The thermal decomposition of 2-(4-methoxycarbonylphenyl)-5-nitryl-6-hydroxybenzoxazole(MNB) in N2 atmosphere was studied by thermogravimetry(TG) and differential thermogravimetry(DTG).It is a sequential process.The mo...The thermal decomposition of 2-(4-methoxycarbonylphenyl)-5-nitryl-6-hydroxybenzoxazole(MNB) in N2 atmosphere was studied by thermogravimetry(TG) and differential thermogravimetry(DTG).It is a sequential process.The molecular bond orders were calculated by GAMESS method and the IR spectra of MNB and its intermediates in thermal decomposition at various temperatures were determined.The mechanism of the thermal decomposition has been discussed,the C-N bond breakdown and the nitro group elimination occurred in the initial step of the decomposition.The thermal decomposition kinetic parameters such as apparent activation energy E=115.5kJ·mol-1,pre-exponential factor A = 1.698×1010 min-1 and apparent reaction order n = 0 were obtained according to test data.展开更多
Chial Complexes of Mn3+, Fe3+, Ni2+ and Cu2+ were prepared from chiral Schiff Base ligand obtained by condensation of new type methyl 5-(1,1-dimethylethyl)-3-formyl-4-hydroxybenzoate synthesized by this work with (1R,...Chial Complexes of Mn3+, Fe3+, Ni2+ and Cu2+ were prepared from chiral Schiff Base ligand obtained by condensation of new type methyl 5-(1,1-dimethylethyl)-3-formyl-4-hydroxybenzoate synthesized by this work with (1R, 2R)-1,2-diaminocyclohexane. The new chiral ligand and complexes were characterized by elementary analysis, 1H NMR, IR and UV-Vis.展开更多
文摘The thermal decomposition of 2-(4-methoxycarbonylphenyl)-5-nitryl-6-hydroxybenzoxazole(MNB) in N2 atmosphere was studied by thermogravimetry(TG) and differential thermogravimetry(DTG).It is a sequential process.The molecular bond orders were calculated by GAMESS method and the IR spectra of MNB and its intermediates in thermal decomposition at various temperatures were determined.The mechanism of the thermal decomposition has been discussed,the C-N bond breakdown and the nitro group elimination occurred in the initial step of the decomposition.The thermal decomposition kinetic parameters such as apparent activation energy E=115.5kJ·mol-1,pre-exponential factor A = 1.698×1010 min-1 and apparent reaction order n = 0 were obtained according to test data.
文摘Chial Complexes of Mn3+, Fe3+, Ni2+ and Cu2+ were prepared from chiral Schiff Base ligand obtained by condensation of new type methyl 5-(1,1-dimethylethyl)-3-formyl-4-hydroxybenzoate synthesized by this work with (1R, 2R)-1,2-diaminocyclohexane. The new chiral ligand and complexes were characterized by elementary analysis, 1H NMR, IR and UV-Vis.
