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国家自然科学基金(20273013)

作品数:26 被引量:83H指数:6
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26 条 记 录,以下是 1-10
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甲醇在Au(111)表面吸附的密度泛函研究被引量:20
2006年
采用基于第一性原理的密度泛函理论和周期平板模型相结合的方法,对CH3OH分子在Au(111)表面top,fcc,hcp和bridge位的吸附模型进行了构型优化、能量计算以及Mulliken布居分析,结果表明top位是较有利的吸附位.吸附的CH3OH解离产生甲氧基CH3O和H,对它们在Au(111)面的吸附进行的计算表明,bridge和fcc位分别是二者的最佳吸附位.对过渡态的计算给出了CHOH在Au表面解离吸附的可能机理:首先发生O-H键的断裂,继而生成甲氧基中间体.
刘书红陈文凯曹梅娟许莹李俊篯
关键词:甲醇AU(111)表面密度泛函理论过渡态
S_2BrH的构型及其异构化反应的理论研究
2004年
B3LYP calculations of density functional theory (DFT)with 6-311+G(3df,2p)basis set level are used to investigate the equilibrium structures and intramolecular rearrangement reactions of the linear BrSSH and branched S=SBrH isomers.The calculated results shows that the linear structure is more stable than the branched structure (lower 73.1kJ·mol-1 corrected with zero point vibrational energy) energetically.The calculated energy barriers for the intramolecular bromine atom transfer and hydrogen atom transfer isomerization processes are 174.1kJ·mol-1 and 173.7kJ·mol-1,respectively.The kinetic results demonstrate that the isomerization is a unimolecular one,and the reaction rate is rather slow.It is consistent with thermodynomical results.So the isomerization process should proceed via the other likely processes.
杨迎春陈文凯叶芝祥杨怀金
关键词:密度泛函理论过渡态理论热力学性质动力学性质
S_2O_2分子稳定结构的密度泛函理论研究被引量:1
2004年
采用密度泛函理论中的B3LYP方法,在6-311+G(3df)和Aug-cc-pVTZ水平上,研究了单态S2O2分子的各种可能的异构体及其相对稳定性。结果表明,具有C2v对称性的三角平面分叉异构体的热力学稳定性要高于目前实验上唯一被发现的具有C2v对称性的cis-OSSO异构体,同时trans-OSSO的稳定性与顺式异构体十分接近,这2种异构体应该可以在实验上被观察到。同时本文还讨论了3个最稳定构型的前线分子轨道和链型OSSO的内扭转势能。
陈文凯李俊篯章永凡丁开宁李奕
关键词:密度泛函理论B3LYP方法异构体量子化学
DFT Study of Thiophene Adsorption on the Pd(111) and Pt(111) Surfaces被引量:1
2010年
Thiophene adsorption on the(111) surfaces of Pd and Pt have been investigated by density functional theory.The results indicate that the adsorption at the hollow sites is the most stable.To our interest,the molecular plane of thiophene ring is distorted with C=C bond being elongated to 1.450 and C–C bond being shortened to 1.347 ,and the C–H bonds tilt 13.91~44.05o away from this plane.Furthermore,analysis on population and density of states verified the calculated adsorption geometries.Finally,charge analysis suggests that thiophene molecule is an electron acceptor,reflecting the interaction between the lone pair of sulfur and the d-orbitals of metal.
陈展虹丁开宁徐香兰李俊篯
关键词:THIOPHENEPALLADIUMPLATINUMDFTCALCULATIONSADSORPTION
S_2ClF的构型及其异构化反应的密度泛函理论研究被引量:1
2004年
采用量子化学中的密度泛函理论B3LYP方法,在6-311+G(3df)水平上,全优化得到了S2ClF线型和分叉型2种异构体的平衡结构,同时对可能发生的分子内卤素原子迁移反应的过渡态进行了考察。计算结果表明,从能量角度看,线型的ClSSF为稳定构型,热力学和动力学计算表明,无论是F原子迁移还是Cl原子迁移,分子内的原子迁移需要较高的活化能,并且速度很慢。
陈文凯章永凡徐艺军李奕李俊
关键词:构型异构化反应密度泛函理论量子化学过渡态理论卤化物
A DFT Study of Thiophene Adsorption on the Rh(111) Surfaces
2010年
Thiophene adsorption on the Rh(111) surfaces has been investigated by density functional theory.The results show that the adsorption at the hollow and bridge sites is the most stable.The molecular plane of the thiophene ring is distorted,the C=C bond is stretched to 1.448 and the C–C bond is shortened to 1.390.The C–H bonds tilt 22~42oaway from the surface.The calculated adsorption geometries are in reasonable agreement with population analysis and density of states.The thiophene molecule obtains 0.74 electrons, reflecting the interaction between the lone pair of sulfur and the d-orbitals of metal. The reaction paths and transition states for desulfurization of the molecule have been investigated. The bridge adsorption structure of thiophene leads to a thiol via an activated reaction with an energetic barrier of 0.30 eV. This second step is slightly difficult, and dissociation into a C4H4 fragment and a sulfur atom is possible, with an energetic barrier of 0.40 eV.
陈展虹丁开宁徐香兰李俊篯
关键词:THIOPHENERHODIUMDFTCALCULATIONSADSORPTION
Theoretical Study of Cr Doped into TiO_2(110) Surface被引量:2
2005年
The Cr doped into TiO2(110) surface has been studied systematically by using periodic DFT/B3LYP method with slab model. It is found that doping Cr into perfect TiO2 (110) surface can reduce the value of band-gap from 3.13 to 1.16 eV, and then photocatalysis reaction may be achieved in visual light area. The results are in good agreement with the experiments.
DINGKai-NingZHANGYong-FanLIYiLIJun-Qian
关键词:DFT
A DFT Study of 2-Bromothiophene Adsorption on the Rh(111)Surface
2010年
Adsorption behaviors of 2-bromothiophene on the Rh(111) surface were discussed with DFT. The results revealed that adsorption at the parallel hol site and bridge site was the most stable. After adsorption, bond length of 2-bromothiophene changed significantly. Molecular plane was distorted, and C-H (Br, S) in the molecule was oblique and upswept against the metal surface. Vertical adsorption site was less stable than the plane adsorption site, but there was no distortion for the thiophene ring after adsorption. Aromaticity of 2-bromothiophene was destroyed at the hol and bridge adsorption sites, and the carbon atom in the thiophene ring presented quasi-sp3 hybfidizaton. After adsorption at the parallel hol, 2-bromothiophene obtained 0.86 electrons in total, and Rh(111) surface lost 2.08 electrons in all.
CHEN Zhan-HongDING Kai-NingXU Xiang-LanLI Jun-Jian
关键词:ADSORPTION
固体表面电子态的结构调控理论研究
<正>固体表面的结构与成分修饰是调控表面性质,设计新型材料的关键技术之一,在理论和应用上均具有重要意义。表面修饰涉及表面反应与电子态变化等复杂问题,采用DOS描述固体性质的经典能带理论,只表达能量单参量的平均电子态,难以...
李俊篯
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苯分子在Cu(100)面平板模型上吸附的密度泛函理论研究被引量:19
2005年
使用量子化学中的密度泛函理论和平板周期模型方法,研究了苯在Cu(100)面上的吸附方式和相对稳定性.计算结果表明,苯在Cu(100)表面的吸附属于较强的化学作用,稳定性穴位优于桥位,顶位吸附最不稳定.在吸附过程中,C—C键有相对大的伸长,C—H键的键长变化较小,但是偏离苯环平面,并背离固体表面,顶位则是朝向表面.吸附过程中,发生了电子从苯向铜原子的转移.
陈文凯曹梅娟刘书红许莹李奕李俊篯
关键词:CU(100)密度泛函理论
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