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叠氮二乙基铝和镓多聚体结构和性质的密度泛函理论研究(英文)
Structure-properties of Diethylmetallic Azides Clusters of Aluminum and Gallium by DFT
【摘要】 采用DFT-B3LYP/SDD方法系统研究了(Et2MN3)n(n=1 -3,M=Al, Ga)体系。二聚体(Et2MN3)2和三聚体(Et2MN3)3(M=Al, Ga)分别拥有四元环M2N2和六元环M3N3结构。与单体相比,二聚体(Et2MN3)2和三聚体(Et2MN3)3(M=Al, Ga)的键长变化次序均为Nα—M>Nα—Nβ>Nβ—Nγ≈M—C。二聚体(Et2AlN3)2的结合能比(Et2GaN3)2低35.44 kJ.mol-1,而三聚体(Et2AlN3)3的结合能比(Et2GaN3)3低45.61 kJ.mol-1。热力学性质表明叠氮二乙基铝和镓体系在298.2 K温度下均以二聚体为主。在低于500 K的温度下,二聚化和三聚化反应在热力学上是有利的。
【Abstract】 (Et2MN3)n(n=1 to 3,M=Al,Ga) clusters were studied by DFT/B3LYP method with SDD basis set.The dimer(Et2MN3)2 and trimer(Et2MN3)3(M=Al,Ga) are found to exhibit four-membered M2N2 and six-membered M3N3 ring structure,respectively.Compared with the monomer,the order of the bond length changes for the dimer(Et2MN3)2 and trimer(Et2MN3)3(M=Al,Ga) is as follows:Nα—M>Nα—Nβ>Nβ—Nγ≈M—C.Binding energies of the dimer(Et2AlN3)2 and trimer(Et2AlN3)3 clusters are 35.44 and 45.61 kJ·mol-1 lower than that of(Et2GaN3)2 and(Et2GaN3)3 clusters,respectively.Thermodynamic properties show that the dimer is the main composition of the(Et2MN3)n(n=1 to 3,M=Al,Ga) clusters at 298.2 K.The dimerization and trimerization are very favorable thermodynamically below 500 K.
【Key words】 physical chemistry; (Et2MN3)n(n=1 to 3,M=Al,Ga); density functional theory(DFT); binding energy; thermodynamic property;
- 【文献出处】 含能材料 ,Chinese Journal of Energetic Materials , 编辑部邮箱 ,2009年03期
- 【分类号】O631.1
- 【被引频次】1
- 【下载频次】78