N-甲替甲酰胺-水的氢键团簇的从头计算研究 |
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摘 要: |
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Ab initio Study of the Hydrogen-bonded Clusters of N-methylformamide-water |
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Authors: | Mu Xiaolan Jin Yanling Wang Xiuyan Lou Nanquan |
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Abstract: | The N-methylformamide(NMF)-water clusters were studied by ab inito calculations at MP2/6-31+G** and MP2 / 6-311 ++ G(d,p)levels. The equilibrium geometries and the dissociation channels and dissociation energies of both neutral and ionic NMF-H2O clusters are presented. For N-methylformamide,cis-form has lower energy than trans-form. In NMFH+,the proton prefers to link with the O atom of N-methylformamide. The results show that both cis- and trans- form of NMF can form a linear hydrogen bond with water. Although the energy of trans-NMF is higher than cis-NMF,trans-form exits more stably because it can form a double hydrogen bond with water. After the ionization of the NMF-H2O cluster,both the cis- and the trans-form will produce protonated products. |
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Keywords: | NMF-water clusters,ab inito calculations,Proton transfer |
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