二原子硫化物的电子结构
Nickolas A Joyner1, João Gabriel Farias Romeu1, Cole R Durkee1
1Department of Chemistry and Biochemistry, The University of Alabama, Shelby Hall, Tuscaloosa, Alabama 35487-0336, United States.
The journal of physical chemistry. A
|November 4, 2024
概括
这项研究研究了-硫 (Ni-S) 键,该键对于吸收SO2和SO3.3等酸性气体至关重要. 高级量子化学计算准确地预测了NiS属性,对相关系统验证了密度函数理论 (DFT).
科学领域:
- 计算化学的计算化学
- 材料科学 材料科学 材料科学
- 表面化学 表面化学
背景情况:
- -硫 (Ni-S) 键对于理解大气中的易斯酸气体,包括二氧化硫 (SO2) 和三氧化硫 (SO3) 在表面上的吸附至关重要.
- 准确的理论预测Ni-S键特性对于开发具有定制气体吸附能力的材料至关重要.
研究的目的:
- 使用高级量子化学方法研究Ni-S键的电子结构和振动频率.
- 为了对各种密度函数理论 (DFT) 函数进行基准测试,以确定它们在预测 Ni-S 债券属性的准确性.
- 评估DFT方法在酸气吸附系统中模拟涉及Ni-S物种的反应的适用性.
主要方法:
- 高级量子化学计算,包括合集群单双和三次 (CCSD(T),完整的活性空间自相一致场 (CASSCF) 和内部合约的多引用配置交互 (icMRCI) + Q.
- 对43种不同的DFT函数进行比较,与已建立的理论方法和实验数据进行比较.
- 为NiS计算振动频率,基本状态电子配置和键解离能.
主要成果:
- 确定NiS的基本状态是icMRCI + Q水平上的3Σ−状态,与实验结果一致,纠正了CASSCF对5Δ状态的预测.
- 使用icMRCI+Q计算的Ni-S (519.1cm−1) 的振动频率与实验值 (512.68cm−1) 有很好的一致性.
- 在43个测试者中,BP86和O3LYP被确定为最准确的DFT函数来预测Ni-S振动频率. DFT 方法在预测 SO.O 的 NiO 位移能量方面表现出可变的准确性.
结论:
- 高级量子化学方法,特别是icMRCI + Q,为Ni-S键特性提供了准确的预测,包括其基本状态和振动频率.
- DFT方法,特别是BP86和O3LYP,对模拟与酸气吸附相关的Ni-S相互作用充满希望,尽管它们的性能可能因特定反应而异.
- 该研究验证了使用计算方法来理解Ni-S结合及其在与大气污染物的表面相互作用中的作用.
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