【摘要】 利用滴定量热技术并结合适当的热力学循环测定了乙腈溶液中7个取代的N-亚硝基吲哚化合物中N—NO键的异裂能和均裂能,能量范围分别为206.1~246.2 kJ/mol和119.1~124.6 kJ/mol.表明N-亚硝基吲哚均裂释放NO自由基(NO.)比异裂释放NO正离子(NO+)要容易得多,通过热力学循环得到的相应自由基负离子中N—NO键的异裂能和均裂能的能量范围分别为25.5~34.4和5.0~40.5 kJ/mol,表明所研究化合物的自由基负离子在室温下很不稳定.更多还原

【Abstract】 The heterolytic and homolytic N-NO bond dissociation energies of seven N-nitrosoindole derivatives were evaluated by using titration calorimetry and relative thermodynamic cycles.The energetic scales of the heterolytic and homolytic N-NO bond dissociation energies of N-nitrosoindoles cover the ranges from 206.1 to 246.2 kJ/mol and from 119.1 to 124.6 kJ/mol,respectively,which indicates that N-nitrosoindoles are much easier to release a NO radical(NO\5) rather than a NO cation(NO+).The estimation of the heterolytic and homolytic(N-NO)-\5 bond dissociation energies of the N-nitrosoindoles radical anions gives the energetic ranges from 25.5 to 33.4 kJ/mol and from 5.0 to 40.5 kJ/mol for the(N-NO)-\5 bond homolysis and heterolysis,respectively,which means that N-nitrosoindole radical anions are unstable at room temperature.更多还原