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含能材料  2004 

高能化合物生成热的半经验分子轨道研究

Keywords: 物理化学,高能化合物,生成热,半经验分子轨道方法

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Abstract:

用半经验分子轨道(MO)PM3、AM1、MNDO和MINDO/3方法对66种高能化合物进行几何全优化SCF计算,探讨了诸方法计算生成热(ΔHf)与实验值的关系。结果表明,PM3计算生成热与实验值之间存在良好的线性关系,对已有实验值的35个标题物,线性方程为ΔHf,EXP=-4.98+1.03ΔHf,cal,相关系数为R=0.976,均方根偏差为37.53,以此线性方程预测了高能化合物的生成热。AM1计算生成热较PM3结果差,而MNDO和MINDO/3方法则不适合于此类化合物生成热的计算。即在各种半经验MO方法中,以PM3法最适合预测高能化合物的生成热。

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