title: Introduction to the special issue on halogen bonding.
authors.affiliation: Department of Chemistry and Molecular Biology, University of Gothenburg, Kemigarden 4, Office 8071, SE-412 96 Goteburg, Sweden.
authors.forename: Mate
authors.initials: M
authors.lastname: Erdelyi
authors.affiliation: Department of Chemistry, Materials and Chemical Engineering `Giulio Natta', Politecnico di Milano, Via L. Mancinelli 7, 20131 Milano, Italy.
authors.forename: Pierangelo
authors.initials: P
authors.lastname: Metrangolo
keywords: computational chemistry; crystal engineering; halogen bonding; liquid systems