A QTAIM exploration of the competition between hydrogen and halogen bonding in halogenated 1-methyluracil: water systems
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Using QTAIM we show that the hydrogen bonding complexes of 5-halogenated-1-methyluracil (XmU; X = F, Cl, Br, I or At) with a water molecule were always stronger than the corresponding halogen bonds. The strength of the hydrogen bond decreased with increasing halogen size. The hydrogen bonds displayed an admixture of covalent character but all the halogen bonds were purely electrostatic in nature. An F---O halogen bond was found and was facilitated by an intermediate F---H bonding interaction. The metallicity ξ( r b) of the C=O bonds neighboring the hydrogen bonds and of the C-X bonds contiguous with the halogen bonds was explored.
Huan , G , Xu , T , Momen , R , Wang , L , Ping , Y , Kirk , S R , Jenkins , S & van Mourik , T 2016 , ' A QTAIM exploration of the competition between hydrogen and halogen bonding in halogenated 1-methyluracil: water systems ' Chemical Physics Letters , vol 662 , pp. 67-72 . DOI: 10.1016/j.cplett.2016.09.031
Chemical Physics Letters
© 2016 Published by Elsevier B.V. This work is made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at http://dx.doi.org/10.1016/j.cplett.2016.09.031
The One Hundred Talents Foundation of Hunan Province and the aid program for the Science and Technology Innovative Research Team in Higher Educational Institutions of Hunan Province are gratefully acknowledged for the support of S.J. and S.R.K. The National Natural Science Foundation of China is also acknowledged, project approval number: 21273069.TvM is grateful to EastCHEM for support via the EaStCHEM Research Computing Facility.
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