本文对53种N_nH_n(n=3～7)氮氢化合物进行了理论计算,应用自然键轨道理论(Nature Bond Orbital,NBO)和分子中的原子理论(Atoms In Molecules,AIM)分析了化合物的成键特征、相对稳定性.氮原子孤对电子与氮氮键以及氮氮键相互之间的超共...本文对53种N_nH_n(n=3～7)氮氢化合物进行了理论计算,应用自然键轨道理论(Nature Bond Orbital,NBO)和分子中的原子理论(Atoms In Molecules,AIM)分析了化合物的成键特征、相对稳定性.氮原子孤对电子与氮氮键以及氮氮键相互之间的超共轭作用是影响氮氮键长的重要因素.采用原子基团法,比较了化合物的原子基团能量和原子基团生成热.通过预测53种化合物的稳定性,找出了氮氢化合物的稳定性与结构之间的一些规律,为预测氮氢化合物的稳定性提供了新的方法和新的数据.展开更多
With replacement of N atoms by CH groups in the most stable cycled N4H4 molecules,twelve possible isomers of Nn(CH)4-nH4 have been designed and optimized at the B3LYP/6-311++G level of theory.The vibrational frequenci...With replacement of N atoms by CH groups in the most stable cycled N4H4 molecules,twelve possible isomers of Nn(CH)4-nH4 have been designed and optimized at the B3LYP/6-311++G level of theory.The vibrational frequencies were calculated at the same level of theory.The structures and properties were analyzed with the natural bond orbital(NBO) and the atoms in molecules(AIM)theory.Meanwhile,the dipole moments and the energy have been discussed.The results indicate that stabilities of these isomers increase with more CH groups replacements of N4H4 due to decrements of their densities of energies.The G3B3 calculations show that the isomers have high heat of formations(HOFs)and higher density of energies,which indicate them maybe a kind of potential and novel energetic material.展开更多
采用密度泛函理论的b3lyp方法在6-311++G**基组上对30种N8H8链状异构体进行了理论计算,并应用分子中的原子理论(Atoms In Molecules,AIM)和自然键轨道理论(Nature Bond Orbital,NBO)分析了这些化合物相对稳定性和成键特征,G3MP2方法计...采用密度泛函理论的b3lyp方法在6-311++G**基组上对30种N8H8链状异构体进行了理论计算,并应用分子中的原子理论(Atoms In Molecules,AIM)和自然键轨道理论(Nature Bond Orbital,NBO)分析了这些化合物相对稳定性和成键特征,G3MP2方法计算了各异构体的能量及生成热。结果表明:N8H8链状异构体中,含有N=N双键特征的异构体稳定性较好,影响氮氮键键长变化的主要因素是N原子孤对电子到相邻的氮氮键的超共轭作用;所有异构体中α3的生成热最大,β15的密度最大。展开更多
文摘本文对53种N_nH_n(n=3～7)氮氢化合物进行了理论计算,应用自然键轨道理论(Nature Bond Orbital,NBO)和分子中的原子理论(Atoms In Molecules,AIM)分析了化合物的成键特征、相对稳定性.氮原子孤对电子与氮氮键以及氮氮键相互之间的超共轭作用是影响氮氮键长的重要因素.采用原子基团法,比较了化合物的原子基团能量和原子基团生成热.通过预测53种化合物的稳定性,找出了氮氢化合物的稳定性与结构之间的一些规律,为预测氮氢化合物的稳定性提供了新的方法和新的数据.
文摘With replacement of N atoms by CH groups in the most stable cycled N4H4 molecules,twelve possible isomers of Nn(CH)4-nH4 have been designed and optimized at the B3LYP/6-311++G level of theory.The vibrational frequencies were calculated at the same level of theory.The structures and properties were analyzed with the natural bond orbital(NBO) and the atoms in molecules(AIM)theory.Meanwhile,the dipole moments and the energy have been discussed.The results indicate that stabilities of these isomers increase with more CH groups replacements of N4H4 due to decrements of their densities of energies.The G3B3 calculations show that the isomers have high heat of formations(HOFs)and higher density of energies,which indicate them maybe a kind of potential and novel energetic material.
文摘采用密度泛函理论的b3lyp方法在6-311++G**基组上对30种N8H8链状异构体进行了理论计算,并应用分子中的原子理论(Atoms In Molecules,AIM)和自然键轨道理论(Nature Bond Orbital,NBO)分析了这些化合物相对稳定性和成键特征,G3MP2方法计算了各异构体的能量及生成热。结果表明:N8H8链状异构体中,含有N=N双键特征的异构体稳定性较好,影响氮氮键键长变化的主要因素是N原子孤对电子到相邻的氮氮键的超共轭作用;所有异构体中α3的生成热最大,β15的密度最大。
