利用高级非原位方法研究 CnH2(n = 2-6)族中性异构体和阳离子异构体的能量和光谱参数。

IF 3.4 3区 化学 Q2 CHEMISTRY, MULTIDISCIPLINARY
Lenin J. Díaz Soto, Ricardo R. Oliveira, Leonardo Baptista, Enio F. da Silveira, Marco Antonio Chaer Nascimento
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引用次数: 0

摘要

利用高水平的非原位方法研究了之前通过等离子解吸质谱法(PDMS)从固体甲烷的离子诱导解吸中检测到的阳离子物种和中性物种。从一组属于 CnH2(n = 2-6)家族的 25 个阳离子和 26 个中性结构中,获得了能量、旋转常数、谐振频率、电荷分布和激发能量。在 CCSD(T)-F12、CCSD(T)-F12/RI/(cc-pVTZ-F12、cc-pVTZ-F12-CABS、cc-pVQZ/C) (n = 2-5) 和 CCSD(T)/cc-pVTZ (n = 6) 水平的 ZPVE 校正能量显示,最稳定异构体的拓扑结构随 n 和电荷而变化。在 674 个谐波频率中,强度最大的频率一般在 3000-3500 cm-1 范围内。利用 EOM-CCSD 方法计算的 169 个垂直转变能量分析表明,有三种 C6H2 物种可能是星际扩散带(DIB)的载体。对中性物质和阳离子物质的性质进行系统比较有助于复杂基质的结构描述。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Energy and spectroscopic parameters of neutral and cations isomers of the CnH2 (n = 2–6) families using high-level ab-initio approaches

Energy and spectroscopic parameters of neutral and cations isomers of the CnH2 (n = 2–6) families using high-level ab-initio approaches

Energy and spectroscopic parameters of neutral and cations isomers of the CnH2 (n = 2–6) families using high-level ab-initio approaches

Cationic species, previously detected from ion-induced desorption of solid methane by plasma desorption mass spectrometry (PDMS), and neutral species, are investigated using high-level ab-initio approaches. From a set of 25 cationic and 26 neutral structures belonging to CnH2 (n = 2–6) families, it was obtained the energy, rotational constants, harmonic vibrational frequency, charge distribution and excitation energies. The ZPVE-corrected energies, at CCSD(T)-F12; CCSD(T)-F12/RI/(cc-pVTZ-F12, cc-pVTZ-F12-CABS, cc-pVQZ/C) (n = 2–5) and CCSD(T)/cc-pVTZ (n = 6) levels, reveal that the topology of the most stable isomer vary with n and the charge. Out of 674 harmonic frequencies, those with maximum intensity are generally in the 3000–3500 cm−1 range. Analysis of 169 vertical transition energies calculated with the EOM-CCSD approach, suggest three C6H2 species as potential carriers of the diffuse interstellar bands (DIB). Systematic comparison of properties between neutral and cationic species can assist in the structural description of complex matrices.

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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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