Fourier transform microwave spectra of the very weakly bound He–CO 2 dimer
摘要:
Spectra of pure rotational transitions of the very weakly bound He-CO2 van der Waals complex were investigated using a pulsed molecular beam Fourier Transform microwave spectrometer. The complex exhibits very large amplitude internal vibrational motions and the rotational transitions were, as a consequence, difficult to locate and to assign. Eight isotopomers, namely He-CO2, He-(CO2)-C-13, He-(OCO)-O-18, He-(OCO)-C-13-O-18, He-(OCO)-O-18-O-18, He-(OCO)-O-18-C-13-O-18, He-(OCO)-O-17, and He-(OCO)-C-13-O-17, Were studied in order to establish the assignments. The hyperfine structures due to the quadrupolar O-17 nucleus were resolved and analyzed in the two O-17 containing isotopomers. The observed nuclear quadrupole hyperfine structures not only provide further confirmation for the assignment but also give new information about the angular anisotropy of the He-CO2 interaction potential. (C) 2001 Elsevier Science B.V. All rights reserved.
A CO<sub>2</sub>-mediated base catalysis approach for the hydration of triple bonds in ionic liquids
作者:Minhao Tang、Fengtao Zhang、Yanfei Zhao、Yuepeng Wang、Zhengang Ke、Ruipeng Li、Wei Zeng、Buxing Han、Zhimin Liu
DOI:10.1039/d1gc03865f
日期:——
approach for the activation of triplebonds in ionic liquids (ILs) with anions that can chemically capture CO2 (e.g., azolate, phenolate, and acetate), which can achieve hydration of triplebonds to carbonyl chemicals. It is discovered that the anion-complexed CO2 could abstract one proton from proton resources (e.g., IL cation) and transfer it to the CN or CC bondsvia a six-membered ring transition
在此,我们报告了一种 CO 2介导的碱催化方法,用于激活离子液体 (IL) 中的三键,其中的阴离子可以化学捕获 CO 2(例如,唑盐、酚盐和乙酸盐),从而实现三键的水合羰基化学品。发现阴离子络合的CO 2可以从质子资源(例如IL阳离子)中提取一个质子,并通过六元环过渡态将其转移到C N 或C C 键,从而实现它们的水合。特别是,四丁基鏻 2-羟基吡啶在 CO 2下对腈和含C C 键的化合物的水合显示出高效率气氛,以优异的收率提供一系列羰基化合物。这种催化方案简单、绿色、高效,开辟了一种在温和和无金属条件下通过三键水合获得羰基化合物的新方法。
Oxidative C–C Bond Cleavage for the Synthesis of Aryl Carboxylic Acids from Aryl Alkyl Ketones
作者:Meichao Li、Zhenlu Shen、Liang Xu、Shengpeng Wang、Bajin Chen、Xinquan Hu、Baoxiang Hu、Liqun Jin、Nan Sun
DOI:10.1055/s-0037-1609751
日期:2018.7
A metal-free and one-pot two-step synthesis of aryl carboxylic acids from arylalkylketones has been achieved. The reactions were performed with iodine as the catalyst, DMSO and TBHP as the oxidants. Under the optimal reaction conditions, a number of arylalkylketones could be converted into their corresponding aryl carboxylic acids in good to excellent yields (up to 94%).
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
Product channels in the 193-nm photodissociation of HCNO (fulminic acid)
作者:Wenhui Feng、John F. Hershberger
DOI:10.1016/j.chemphys.2016.02.017
日期:2016.6
CO, DCN and HNCO molecules were detected upon laser photolysis of HCNO/reagents/buffer gas mixtures. Analysis of the yields of product molecules leads to the following photolysisquantumyields: ϕ 1a (O + HCN) = 0.38 ± 0.04, ϕ 1b (H + (NCO)) = 0.07 ± 0.02, ϕ 1c (CN + OH) = 0.24 ± 0.03, ϕ 1d (CO + NH(a 1 Δ)) ϕ 1e (HNCO) = 0.02 ± 0.01 and ϕ 1f (CH + NO) = 0.21 ± 0.1, respectively.