Some measures for making halogen bonds stronger than hydrogen bonds in H2CS–HOX (X = F, Cl, and Br) complexes

Literature Information

Publication Date 2010-12-01
DOI 10.1039/C0CP01543A
Impact Factor 3.676
Authors

Qing-Zhong Li, Bo Jing, Ran Li, Zhen-Bo Liu, Wen-Zuo Li, Feng Luan, Jian-Bo Cheng, Bao-An Gong, Jia-Zhong Sun


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Abstract

The properties and applications of halogen bonds are dependent greatly on their strength. In this paper, we suggested some measures for enhancing the strength of the halogen bond relative to the hydrogen bond in the H2CS–HOX (X = F, Cl, and Br) system by means of quantum chemical calculations. It has been shown that with comparison to H2CO, the S electron donor in H2CS results in a smaller difference in strength for the Cl halogen bond and the corresponding hydrogen bond, and the Br halogen bond is even stronger than the hydrogen bond. The Li atom in LiHCS and methyl group in MeHCS cause an increase in the strength of halogen bonding and hydrogen bonding, but the former makes the halogen bond stronger and the latter makes the hydrogen bond stronger. In solvents, the halogen bond in the Br system is strong enough to compete with the hydrogen bond. The interaction nature and properties in these complexes have been analyzed with the natural bond orbital theory.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
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