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Halogen bonds and other noncovalent interactions in the crystal structures of 1,2-diiodo alkenes: an ab initio and QTAIM study
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  • Yongna Yuan,
  • Matthew Mills,
  • Fuyang Li,
  • Yuhong Du,
  • Jiaxuan Wei,
  • Wei Su
Yongna Yuan
Lanzhou University
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Matthew Mills
Joint BioEnergy Institute
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Fuyang Li
Lanzhou University
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Yuhong Du
Lanzhou University
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Jiaxuan Wei
Lanzhou University
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Wei Su
Lanzhou University
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Abstract

A series of interatomic interactions interpretable as halogen bonds involving I…I, I…O, and I…C(π), as well as the noncovalent interactions I…H and O…O were observed in the crystal structures of 1,2-diiodoolefins dimers according to ab initio calculations and the quantum theory of “atoms in molecules” (QTAIM) method. The interplay between each type of halogen bond and other noncovalent interactions was studied systematically in terms of bond length, electrostatic potential and interaction energy, which are calculated via ab initio methods at the B3LYP-D3/6-311++G(d,p) and B3LYP-D3/def2-TZVP levels of theory. Characteristics and nature of the haologen bonds and other noncovalent interactions, including the topological properties of the electron density, the charge transfer and their strengthening or weakening, were analyzed by means of both QTAIM and “natural bond order” (NBO). These computational methods provide additional insight into observed intermolecular interactions and are utilized to explain the differences seen in the crystal structures.