首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Lewis Acid-Base Interactions in Weakly Bound Formaldehyde Complexes with CO2,HCN,and FCN:Considerations on the Cooperative H-Bonding Effects
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Lewis Acid-Base Interactions in Weakly Bound Formaldehyde Complexes with CO2,HCN,and FCN:Considerations on the Cooperative H-Bonding Effects

机译:弱结合甲醛与CO2,HCN和FCN的路易斯酸-碱相互作用:关于协同氢键作用的考虑

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Ab initio quantum chemistry calculations reveal that HCN and mainly FCN can form Lewis acid-base complexes with formaldehyde associated with cooperative H bonds,as first noticed by Wallen et al.(Blatchford,M.A.;Raveendran,P.;Wallen,S.L.J.Am.Chem.Soc.2002,724,14818-14819) for CO2-philic materials under supercritical conditions.The present results,obtained with MP2(Full)/aug-cc-pVDZ calculations,show that the degeneracy of the v2 mode in free HCN or FCN is removed upon complexation in the same fashion as that of CO2.The splitting of these bands along with the electron structure analysis provides substantial evidence of the interaction of electron lone pairs of the carbonyl oxygen with the electron-deficient carbon atom of the cyanides.Also,this work investigates the role of H bonds acting as additional stabilizing interactions in the complexes by performing the energetic and geometric characterization.
机译:从头开始的量子化学计算显示,HCN和主要为FCN可以与路易斯酸形成与路易斯酸配位的配合物,而甲醛与配合的H键相关联(Wallen等人(Blatchford,MA; Raveendran,P。; Wallen,SLJAm.Chem (Soc.Soc.2002,724,14818-14819)在超临界条件下对亲CO2的材料进行分析。本结果通过MP2(Full)/ aug-cc-pVDZ计算获得,表明v2模式在自由HCN或HCN中的简并性。络合时以与CO2相同的方式除去FCN。这些带的分裂以及电子结构分析为羰基氧的电子孤对与氰化物的缺电子碳原子之间的相互作用提供了重要证据。此外,这项工作还通过执行高能和几何表征研究了H键在配合物中作为其他稳定相互作用的作用。

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