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首页> 外文期刊>Spectrochimica acta, Part A. Molecular and biomolecular spectroscopy >Lewis acid-base adducts: A quantitative Raman analysis of formamide and dimethylsulfoxide mixtures
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Lewis acid-base adducts: A quantitative Raman analysis of formamide and dimethylsulfoxide mixtures

机译：Lewis酸碱加合物：甲酰胺和二甲亚砜混合物的定量拉曼分析

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摘要

Raman spectra of pure liquid dimethylsulfoxide (DMSO) and of binary mixtures of formamide (FA) and DMSO in different compositions were obtained. The vibrations involving the SO functional group in the band envelope at ca. 1050cm(-1) of pure liquid DMSO are assigned to monomers, dimers and higher aggregates of DMSO. The appearance of a new band at 1024 cm(-1), whose intensity shows large dependence on the FA concentration, is assigned to a FA-DMSO adduct. This has been possible due to the two H-bond donor sites of FA and the strong donor character of DMSO that become the environment propitious for the donor-acceptor reaction. Quantitative analysis performed in the SO stretching region in the binary mixtures gives a 1:1 stoichiometry in this adduct in the limit of infinite dilution. This proportion is in full agreement with our previous determination for the FA-ACN adduct. The experimental evidence of the 1:1 FA-DMSO adduct is presented for the first time using Raman spectroscopy. The results described here open new possibilities to study the acid-base reactions nature of FA adducts. (c) 2006 Elsevier B.V. All rights reserved.
机译：获得了纯液体二甲基亚砜（DMSO）以及甲酰胺（FA）和DMSO二元混合物在不同组成下的拉曼光谱。包含在带包络中的SO官能团的振动大约为。 1050cm（-1）的纯液态DMSO被分配给DMSO的单体，二聚体和更高的聚集体。新的条带出现在1024 cm（-1）处，其强度显示出对FA浓度的很大依赖性，被分配给FA-DMSO加合物。由于FA的两个H键供体位点和DMSO的强供体特性，使之成为有利于供体-受体反应的环境，因此这是可能的。在二元混合物的SO拉伸区域中进行的定量分析在无限稀释的范围内使该加合物的化学计量比为1：1。该比例与我们先前对FA-ACN加合物的确定完全一致。首次使用拉曼光谱法显示了1：1 FA-DMSO加合物的实验证据。此处描述的结果为研究FA加合物的酸碱反应性质开辟了新的可能性。 （c）2006 Elsevier B.V.保留所有权利。

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