How do halogen bonds (S–O⋯I, N–O⋯I and C–O⋯I) and halogen–halogen contacts (C–I⋯I–C, C–F⋯F–C) subsist in crystal structures? A quantum chemical insight

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• 作者：B. Vijaya Pandiyan ; P. Deepa ; P. Kolandaivel
• 关键词：Halogen bond ; Stabilization energy ; Hirshfeld surface ; Nucleus independent chemical shift (NICS) ; Atoms in molecules (AIM) ; Molecular electrostatic potential (MESP) map
• 刊名：Journal of Molecular Modeling
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：23
• 期：1
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Computer Applications in Chemistry; Molecular Medicine; Computer Appl. in Life Sciences; Characterization and Evaluation of Materials; Theoretical and Computational Chemistry;
• 出版者：Springer Berlin Heidelberg
• ISSN：0948-5023
• 卷排序：23

文摘

Thirteen X-ray crystal structures containing various non-covalent interactions such as halogen bonds, halogen–halogen contacts and hydrogen bonds (I⋯N, I⋯F, I⋯I, F⋯F, I⋯H and F⋯H) were considered and investigated using the DFT-D3 method (B97D/def2-QZVP). The interaction energies were calculated at MO62X/def2-QZVP and MP2/aug-cc-pvDZ level of theories. The higher interaction and dispersion energies (2nd crystal) of −9.58 kcal mol−1 and −7.10 kcal mol−1 observed for 1,4-di-iodotetrafluorobenzene bis [bis (2-phenylethyl) sulfoxide] structure indicates the most stable geometrical arrangement in the crystal packing. The electrostatic potential values calculated for all crystal structures have a positive σ-hole, which aids understanding of the nature of σ-hole bonds. The significance of the existence of halogen bonds in crystal packing environments was authenticated by replacing iodine atoms by bromine and chlorine atoms. Nucleus independent chemical shift analysis reported on the resonance contribution to the interaction energies of halogen bonds and halogen–halogen contacts. Hirshfeld surface analysis and topological analysis (atoms in molecules) were carried out to analyze the occurrence and strength of all non-covalent interactions. These analyses revealed that halogen bond interactions were more dominant than hydrogen bonding interactions in these crystal structures.