Infrared spectroscopy of (12C18O2)2 and isotope effect on the vibrationally averaged structure of (CO2)2
摘要:
The high-resolution infrared spectrum of ((CO2)-C-12-O-18)(2) has been observed in the v(3) band (2314 cm(-1)) region of (CO2)-C-12-O-18 with diode laser absorption spectroscopy of pulsed molecular beam. The vibrational band origin of((CO2)-C-12-O-18)(2) corresponding to the v(3) mode of (CO2)-C-12-O-18 shows a blue shift of 1.62362(19) cm(-1) with respect to that of (CO2)-C-12-O-18. The geometrical parameters of the slipped parallel ground-state structure are R-CC = 3.5947(11) Angstrom and theta(CCO) = 57.97(7)degrees. By calculating vibrational wavefunctions on ab initio potentials for four intermolecular degrees of freedom, the isotope effect on R-CC is found to arise mainly from in-plane tilting. (C) 2004 Elsevier B.V. All rights reserved.
Palladium-Catalyzed Cyclization Reaction of <i>o</i>-Iodoanilines, CO<sub>2</sub>, and CO: Access to Isatoic Anhydrides
作者:Wen-Zhen Zhang、Ning Zhang、Yu-Qian Sun、Yu-Wei Ding、Xiao-Bing Lu
DOI:10.1021/acscatal.7b03000
日期:2017.12.1
oxidants. Herein we report a highly selective palladium-catalyzed cyclizationreaction for the efficient synthesis of isatoic anhydrides from readily available o-iodoanilines, CO2, and CO. The reaction proceeds under mild conditions and is redox-neutral. Both CO2 and CO are indispensable C1 building blocks for this catalytic reaction.
which has a barrel-shaped geometry and is already known from microwavespectroscopy. A weaker infrared band centered at 2050.702 cm−1 was assigned to a new isomeric form, observed here for the first time, which was expected on the basis of ab initio calculations. Infrared bands for seven isotopomers were recorded in an attempt to quantify the structure of the new isomer. Because it has no symmetry elements
通过直接红外吸收光谱研究了OCS-(CO 2)2范德华配合物的振动-旋转光谱。在超音速狭缝喷射设备中生成复合物,并使用快速扫描可调谐二极管激光器探测膨胀气体。观察到复合物的两种不同异构形式的红外谱带。最稳定的异构体具有以2058.799 cm -1为中心的相对强的带,该异构体具有桶形几何形状,并且已经从微波光谱学中获知。以2050.702 cm -1为中心的较弱的红外波段被赋予一种新的异构形式,这是第一次在这里观察到,这是从头算的基础上预期的。记录了七个同功异构体的红外谱带,以试图量化新异构体的结构。由于它没有对称元素,因此需要9个参数来完全定义几何形状。可以确定其中的六个,它们定义了复合物中OCS单体相对于CO 2二聚体片段的相对位置,而其余三个固定在其从头算值。讨论了OCS-(CO 2)2的两个异构体的表面与相关二聚体之间的异同。
Formation of complex organic molecules in methanol and methanol–carbon monoxide ices exposed to ionizing radiation – a combined FTIR and reflectron time-of-flight mass spectrometry study
作者:Surajit Maity、Ralf I. Kaiser、Brant M. Jones
DOI:10.1039/c4cp04149f
日期:——
photoionization at 10.49 eV. Infrared spectroscopic analysis of the processed ice systems resulted in the identification of simple molecules including the hydroxymethyl radical (CH2OH), formyl radical (HCO), methane (CH4), formaldehyde (H2CO), carbon dioxide (CO2), ethylene glycol (HOCH2CH2OH), glycolaldehyde (HOCH2CHO), methylformate (HCOOCH3), and ketene (H2CCO). In addition, ReTOF mass spectrometry of
Anion-Receptor Mediated Oxidation of Carbon Monoxide to Carbonate by Peroxide Dianion
作者:Matthew Nava、Nazario Lopez、Peter Müller、Gang Wu、Daniel G. Nocera、Christopher C. Cummins
DOI:10.1021/jacs.5b08495
日期:2015.11.25
The reactivity of peroxide dianion O2(2-) has been scarcely explored in organic media due to the lack of soluble sources of this reduced oxygen species. We now report the finding that the encapsulated peroxide cryptate, [O2⊂mBDCA-5t-H6](2-) (1), reacts with carbon monoxide in organic solvents at 40 °C to cleanly form an encapsulated carbonate. Characterization of the resulting hexacarboxamide carbonate
由于缺乏这种还原氧的可溶性来源,在有机介质中几乎没有探索过氧化物二价阴离子 O2(2-) 的反应性。我们现在报告发现封装的过氧化物穴状化合物 [O2⊂mBDCA-5t-H6](2-) (1) 在 40 °C 下与有机溶剂中的一氧化碳反应,干净地形成封装的碳酸盐。通过单晶 X 射线衍射对所得六甲酰胺碳酸盐穴状化合物的表征表明,碳酸二价阴离子与六甲酰胺穴状配体 [CO3⊂mBDCA-5t-H6](2-) (2) 形成九个互补氢键,该结论得到支持通过光谱数据。标记研究和 (17)O 固态 NMR 数据证实,封装碳酸盐中三分之二的氧原子来自过氧化物二价阴离子,而碳来自 CO。通过三种独立合成方法获得了碳酸盐穴状化合物形成的进一步证据:(i) 用 K2CO3 处理游离穴状化合物;(ii) 具有 PPN[HCO3] 的单去质子化密码体;(iii) 具有 TBA[OH] 和大气 CO2 的游离穴状配体。这项工作证明了由氢键阴离子受体介导的
Sustainable Catalytic Synthesis of Diethyl Carbonate
作者:Wahyu S. Putro、Akira Ikeda、Shinji Shigeyasu、Satoshi Hamura、Seiji Matsumoto、Vladimir Ya. Lee、Jun‐Chul Choi、Norihisa Fukaya
DOI:10.1002/cssc.202002471
日期:2021.2.5
New sustainable approaches should be developed to overcome equilibrium limitation of dialkyl carbonate synthesis from CO2 and alcohols. Using tetraethyl orthosilicate (TEOS) and CO2 with Zr catalysts, we report the first example of sustainable catalytic synthesis of diethyl carbonate (DEC). The disiloxane byproduct can be reverted to TEOS. Under the same conditions, DEC can be synthesized using a wide