Halogen bond
Net attractive interaction involving one of the halogen elements / From Wikipedia, the free encyclopedia
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In chemistry, a halogen bond (XB) occurs when there is evidence of a net attractive interaction between an electrophilic region associated with a halogen atom in a molecular entity and a nucleophilic region in another, or the same, molecular entity.[1] Like a hydrogen bond, the result is not a formal chemical bond, but rather a strong electrostatic attraction.[2][3] Mathematically, the interaction can be decomposed in two terms: one describing an electrostatic, orbital-mixing charge-transfer and another describing electron-cloud dispersion. Halogen bonds find application in supramolecular chemistry;[2][3][4] drug design and biochemistry;[5][6] crystal engineering[6] and liquid crystals;[2] and organic catalysis.[6]