Abstract
In the past several years, halogen bonds have been shown to be relevant in crystal engineering and biomedical applications. One of the reasons for the utility of these types of noncovalent interactions in the development of, for example, pharmaceutical ligands is that their strengths and geometric properties are very tunable. That is, substitution of atoms or chemical groups in the vicinity of a halogen can have a very strong effect on the strength of the halogen bond. In this study we investigate halogen-bonding interactions involving aromatically-bound halogens (Cl, Br, and I) and a carbonyl oxygen. The properties of these halogen bonds are modulated by substitution of aromatic hydrogens with fluorines, which are very electronegative. It is found that these types of substitutions have dramatic effects on the strengths of the halogen bonds, leading to interactions that can be up to 100% stronger. Very good correlations are obtained between the interaction energies and the magnitudes of the positive electrostatic potentials (σ-holes) on the halogens. Interestingly, it is seen that the substitution of fluorines in systems containing smaller halogens results in electrostatic potentials resembling those of systems with larger halogens, with correspondingly stronger interaction energies. It is also shown that aromatic fluorine substitutions affect the optimal geometries of the halogen-bonded complexes, often as the result of secondary interactions.
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Acknowledgments
The authors gratefully acknowledge the generous support of the National Science Foundation Experimental Program to Stimulate Competive Research Program (Grant number EPS-0701525) and the National Science Foundation Partnership for Research and Education in Materials Program (Grant number DMR-0934115). This work was a part of the research project No Z40550506 of the Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic , and it was supported by Grant No LC512 from the Ministry of Education, Youth and Sports of the Czech Republic.
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Riley, K.E., Murray, J.S., Fanfrlík, J. et al. Halogen bond tunability I: the effects of aromatic fluorine substitution on the strengths of halogen-bonding interactions involving chlorine, bromine, and iodine. J Mol Model 17, 3309–3318 (2011). https://doi.org/10.1007/s00894-011-1015-6
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DOI: https://doi.org/10.1007/s00894-011-1015-6