Interactions of hydroxyurea with a water molecule. Ab initio molecular orbital study

A. Jabalameli, N. U. Zhanpeisov, A. Nowek, R. H. Sullivan, J. Leszczynski

研究成果: Article査読

19 被引用数 (Scopus)

抄録

Ab initio quantum chemical studies at the HF and MP2 levels with the 6-31G** basis set were formed for hyd ogen bonded complexes of hydroxyurea with a water molecule (HUW). Since at both the HF and MP2 levels of theory the keto forms of both E and Z tautomers of hydroxyurea are found to be much more stable compared to iminol forms, only keto forms were included in our study of HUW. The interaction energies were corrected for the basis set superposition error (BSSE) by using the Boys-Bernardi counterpoise correction scheme. The zero-point vibrational energies are calculated at the MP2/6-31G**//MP2/6-31G** level. In addition, single-point calculations were performed at the MP2/6-311++G(2df,2pd)//MP2/6-31G** and at the CCSD(T)/6-31G**//MP2/6-31G** levels of theory. It was shown that the complex I of HUW is the global minimum on the potential energy surface and also has the largest interaction energy. On the basis of the results of these calculations, the stability of the different conformers of HUW, the nature of the specific hydrogen-bonding interactions, and the interaction energies are discussed.

本文言語English
ページ(範囲)3619-3625
ページ数7
ジャーナルJournal of Physical Chemistry A
101
19
DOI
出版ステータスPublished - 1997 5月 8
外部発表はい

ASJC Scopus subject areas

  • 物理化学および理論化学

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