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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
Journal of Computational Chemistry ( IF 3.4 ) Pub Date : 2024-07-09 , DOI: 10.1002/jcc.27456 Isuru R Ariyarathna 1
Journal of Computational Chemistry ( IF 3.4 ) Pub Date : 2024-07-09 , DOI: 10.1002/jcc.27456 Isuru R Ariyarathna 1
Affiliation
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.
中文翻译:
线性和弯曲 MNX+ 的低位电子态的 Ab 头探索 (M = Ca, Sr, Ba, Ra;X = O、S、Se、Te、Po)及其起源
采用高级多参考和耦合簇量子计算来分析线性 MNX+ 和侧键 M[NX]+ (M = Ca, Sr, Ba, Ra;X = O、S、Se、Te、Po)物种。报告了它们的完整势能曲线 (PEC)、解离能 (Des)、几何参数、激发能 (Tes) 和谐波振动频率 (ωes)。MNX+ 和 M[NX]+ 的前三种化学结合电子态分别为 3∑−、1Δ、1∑+ 和 3A“、1A′、1A”。MNX+ 的 3∑−、1Δ、1∑+ 源自 M+(2D) + NX(2Π) 片段,而 M[NX]+ 的 3A“、1A′、1A” 状态由于避免交叉而解离到 M+(2S) + NX(2Π)。MNX+ 和 M[NX]+ 是势能表面的实最小值,它们可以相互转换。M2+NX−/M2+[NX]− 离子结构是它们低位电子态的准确表示。发现 MNX+ 物种的 Des 取决于相应 NX 配体的偶极矩 (μ),并观察到这两个参数之间的线性关系。
更新日期:2024-07-09
中文翻译:
线性和弯曲 MNX+ 的低位电子态的 Ab 头探索 (M = Ca, Sr, Ba, Ra;X = O、S、Se、Te、Po)及其起源
采用高级多参考和耦合簇量子计算来分析线性 MNX+ 和侧键 M[NX]+ (M = Ca, Sr, Ba, Ra;X = O、S、Se、Te、Po)物种。报告了它们的完整势能曲线 (PEC)、解离能 (Des)、几何参数、激发能 (Tes) 和谐波振动频率 (ωes)。MNX+ 和 M[NX]+ 的前三种化学结合电子态分别为 3∑−、1Δ、1∑+ 和 3A“、1A′、1A”。MNX+ 的 3∑−、1Δ、1∑+ 源自 M+(2D) + NX(2Π) 片段,而 M[NX]+ 的 3A“、1A′、1A” 状态由于避免交叉而解离到 M+(2S) + NX(2Π)。MNX+ 和 M[NX]+ 是势能表面的实最小值,它们可以相互转换。M2+NX−/M2+[NX]− 离子结构是它们低位电子态的准确表示。发现 MNX+ 物种的 Des 取决于相应 NX 配体的偶极矩 (μ),并观察到这两个参数之间的线性关系。