title: Halogen-bonding interactions with π systems: CCSD(T), MP2, and DFT calculations.
abstract: Halogen bonding is a noncovalent interaction between a halogen atom and a nucleophilic site. Interactions involving the π electrons of aromatic rings have received, up to now, little attention, despite the large number of systems in which they are present. We report binding energies of the interaction between either NCX or PhX (X = F, Cl, Br, I) and the aromatic benzene system as determined with the coupled cluster with perturbative triple excitations method [CCSD(T)] extrapolated at the complete basis set limit. Results are compared with those obtained by Møller-Plesset perturbation theory to second order (MP2) and density functional theory (DFT) calculations by using some of the most common functionals. Results show the important role of DFT in studying this interaction.
authors.affiliation: Istituto di Scienze e Tecnologie Molecolari del CNR (CNR-ISTM) and INSTM UdR, Via Golgi 19, 20133, Milano, Italy. alessandra.forni@istm.cnr.it
authors.forename: Alessandra
authors.initials: A
authors.lastname: Forni
authors.forename: Stefano
authors.initials: S
authors.lastname: Pieraccini
authors.forename: Stefano
authors.initials: S
authors.lastname: Rendine
authors.forename: Fabio
authors.initials: F
authors.lastname: Gabas
authors.forename: Maurizio
authors.initials: M
authors.lastname: Sironi