摘要元素周期表中电子亲和能最大的元素是卤族元素Cl原子,其电子亲和能为3.62eV。近年来,研究者发现以金属为中心,以卤族元素为配体得到的化合物具有比卤族元素更大的电子亲和能,这类团簇称为超卤素。如果进一步将超卤团簇中的卤素原子以另一个超卤团簇代替,有可能得到比超卤团簇更高的电子亲和能,这类团簇称为飙卤素。本毕业设计采用密度泛函理论方法,探讨了AuFn(n=1-7)团簇的超卤特性和Cs(AuFn)n团簇的飙卤特性。计算结果表明,n≥2的AuFn团簇的VDE均比Cl原子大,说明它们均具有超卤性,其中AuF6的VDE最大,因而超卤性最强。如果进一步以AuF6为配体构成Cs(AuFn)n团簇,计算结果表明,Cs(AuF6)的VDE比AuF6小,但仍比Cl原子大,说明它仍具有超卤性,但没有表现出飙卤性。而Cs(AuF6)2的VDE比超卤团簇AuF6更大,说明它表现出飙卤性。23715
关键词: 超卤素,飙卤素,密度泛函理论,电子亲和能,垂直剥离能
毕业设计论文外文摘要
Title Properties of Superhalogen Cs(AuF6)n (n=1-4)
Abstract: This paper is to study the properties of superhalogen Cs(AuF6)n (n=1-4).In the superhalogen Cs(AuF6)n (n=1-4),Cs as the main,AuF6 as a ligand to modify elements Cs.Investigating the ligand to change the number,and changes the electron affinity energy generating compound,also studied whether the element Cs with higheroxidation state.In this paper,the main use of the principle of self-consistent field method and density functional theory.We need to understand these two theories, and then on the basis of these two theories,first by example, building a superhalides patial configuration, and then build the structure of the model structure optimization.To calculatethe electronic structure and the nature of the energy systemin this studyon the basis of end-use Gaussian calculation software to obtain experimental data and results, and there sults obtained will be produced into a chart.Then by analyzing the chart to the design for further instructions.
Keywords: superhalogen,hyperhalogen,density functional theory,electron affinity,vertical detachment energy
目 次
1 引言7
2 计算方法9
3 结果与讨论 10
3.1 Cl的电子亲和能 10
3.2 AuFn的几何结构和电子亲和能 11
3.3 Cs(AuF6)n的几何结构和电子亲和能 18
结论 22
致谢 23
参考文献23