CC-stretched formic acid: isomerisation, dimerisation, and carboxylic acid complexation.

CC-stretched formic acid: isomerisation, dimerisation, and carboxylic acid complexation.
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CC-拉伸甲酸:异构化、二聚化和羧酸络合

DOI:
10.1039/d1cp02700j
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发表时间:
2021
期刊:
Physical chemistry chemical physics : PCCP
影响因子:
--
通讯作者:
Arman Nejad
Arman Nejad
中科院分区:
--
文献类型:
--
作者:
Katharina A. E. Meyer;Arman Nejad

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用线性拉曼喷射光谱研究了丙酸单体(HCC-COOH)的顺式-反式异构体,得到了除甲酸(HCOOH)之外的第一个与环境无关的高能量顺式旋转体的振动带中心,以及反式构象的所有基本带和大量的热带和组合带/泛音带。两种不同对称的近等能跨基元(CCO弯曲和OH扭转)被证明是一个敏感的基准测试目标,因为它们的能量顺序容易受到电子结构方法选择、基集大小和包含振动非调和性的影响。对于环(C2h)反式丙酸二聚体的红外和拉曼活性CO拉伸基本原理,发现共振耦合部分延伸到反式丙酸和反式甲酸的cs对称异源二聚体。探索性振动摄动理论(VPT2)计算表明,所有的摄动态都涉及到位于双氢键环上的OH基团的位移。将丙酸二聚体及其与甲酸异二聚体的红外光谱与文献中其他几种羧酸二聚体的红外光谱进行比较,发现在1800 cm−1左右的非基二聚体波段有显著的相似性,在大多数情况下,这一波段迄今尚未确定。VPT2计算和一个简单的谐波模型表明了对称和反对称OH扭转的组合振动。
The cis–trans-isomerism of the propiolic acid monomer (HCC–COOH) is examined with linear Raman jet spectroscopy, yielding the first environment-free vibrational band centres of a higher-energy cis-rotamer beyond formic acid (HCOOH) in addition to all fundamentals and a large number of hot and combination/overtone bands of the trans-conformer. Two near-isoenergetic trans-fundamentals of different symmetry (CCO bend and OH torsion) prove to be a sensitive benchmarking target, as their energetic order is susceptible to the choice of electronic structure method, basis set size, and inclusion of vibrational anharmonicity. For the infrared- and Raman-active CO stretching fundamentals of the cyclic (C2h) trans-propiolic acid dimer, resonance couplings are found that in part extend to the Cs-symmetric heterodimer of trans-propiolic and trans-formic acid. Exploratory vibrational perturbation theory (VPT2) calculations show that all perturbing states involve displacements of the OH moieties located on the doubly hydrogen bonded ring. The comparison of the infrared spectra of the propiolic acid dimer and its heterodimer with formic acid to that of several other carboxylic acid dimers from the literature reveals a notable similarity regarding a non-fundamental dimer band around 1800 cm−1, which in most cases is so far unassigned. VPT2 calculations and a simple harmonic model suggest an assignment to a combination vibration of the symmetric and antisymmetric OH torsion.
DOI: 10.1063/1.5043400
发表时间: 2018-09
期刊: The Journal of chemical physics
影响因子: --
作者:
K. Meyer;M. Suhm
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DOI: --
发表时间: 2019
期刊: Chemical Science
影响因子: 8.4
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