Ab initio exploration of low-lying electronic states of linear and bent MNX+ (M = Ca, Sr, Ba, Ra; X = O, S, Se, Te, Po) and their origins

IF 3.4 3区 化学 Q2 CHEMISTRY, MULTIDISCIPLINARY Journal of Computational Chemistry Pub Date : 2024-07-09 DOI:10.1002/jcc.27456
Isuru R. Ariyarathna
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Abstract

High-level multireference and coupled cluster quantum calculations were employed to analyze low-lying electronic states of linear-MNX+ and side-bonded-M[NX]+ (M = Ca, Sr, Ba, Ra; X = O, S, Se, Te, Po) species. Their full potential energy curves (PECs), dissociation energies (Des), geometric parameters, excitation energies (Tes), and harmonic vibrational frequencies (ωes) are reported. The first three chemically bound electronic states of MNX+ and M[NX]+ are 3, 1Δ, 1+ and 3A″, 1A′, 1A″, respectively. The 3, 1Δ, 1+ of MNX+ originate from the M+(2D) + NX(2Π) fragments, whereas the 3A″, 1A′, 1A″ states of M[NX]+ dissociate to M+(2S) + NX(2Π) as a result of avoided crossings. The MNX+ and M[NX]+ are real minima on the potential energy surface and their interconversions are possible. The M2+NX/M2+[NX] ionic structure is an accurate representation for their low-lying electronic states. The Des of MNX+ species were found to depend on the dipole moment (μ) of the corresponding NX ligands and a linear relationship between these two parameters was observed.

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线性和弯曲 MNX+(M = Ca、Sr、Ba、Ra;X = O、S、Se、Te、Po)的低电平电子态及其起源的 Ab initio 探索。
采用高水平多参量和耦合簇量子计算分析了线性-MNX+ 和侧键-M[NX]+(M = Ca、Sr、Ba、Ra;X = O、S、Se、Te、Po)物种的低洼电子态。报告了它们的全势能曲线 (PEC)、解离能 (Des)、几何参数、激发能 (Tes) 和谐振频率 (ωes)。MNX+ 和 M[NX]+ 的前三个化学结合电子态分别为 3Σ-、1Δ、1Σ+ 和 3A″、1A'、1A″。MNX+ 的 3Σ-、1Δ、1Σ+ 源自 M+(2D) + NX(2Π) 片段,而 M[NX]+ 的 3A″、1A'、1A″态则由于避免交叉而解离成 M+(2S)+NX(2Π)。MNX+ 和 M[NX]+ 是势能面上的真实最小值,它们之间可以相互转化。M2+NX-/M2+[NX]- 离子结构准确地代表了它们的低电子态。研究发现 MNX+ 物种的 Des 值取决于相应 NX 配体的偶极矩 (μ),并且这两个参数之间存在线性关系。
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来源期刊
CiteScore
6.60
自引率
3.30%
发文量
247
审稿时长
1.7 months
期刊介绍: This distinguished journal publishes articles concerned with all aspects of computational chemistry: analytical, biological, inorganic, organic, physical, and materials. The Journal of Computational Chemistry presents original research, contemporary developments in theory and methodology, and state-of-the-art applications. Computational areas that are featured in the journal include ab initio and semiempirical quantum mechanics, density functional theory, molecular mechanics, molecular dynamics, statistical mechanics, cheminformatics, biomolecular structure prediction, molecular design, and bioinformatics.
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