3 years ago

Halogen bonding between substituted chlorobenzene and trimethylamine: Decisive role of σ–hole and CCl bond breaking energy

Halogen bonding between substituted chlorobenzene and trimethylamine: Decisive role of σ–hole and CCl bond breaking energy
Asit. K. Chandra, Dipankar Sutradhar
Theoretical studies have been carried out on the halogen bonding interaction between para substituted chlorobenzene (YC6H4Cl, Y = H, NH2, CH3, F, CN, NO2) and N(CH3)3 using ab initio MP2/aug-cc-pVDZ and DFT based wB97XD/6-311++G(d,p) methods. The positive electrostatic potential (VS,max) on the Cl atom and the heterolytic bond breaking enthalpy of the CCl bond have been calculated and their role on halogen bonding is discussed. The heterolytic bond breaking enthalpy of the CCl bond is proposed as a measure of the strength of the σ-hole on Cl atom. The binding strength of the complexes ranging between −6.13 kJ mol−1 and −9.29 kJ mol−1 are linearly related to the VS,max of the Cl atom and the bond breaking enthalpy of the CCl bond. In addition, energy decomposition analysis was performed on the halogen bonded complexes via symmetry adapted perturbation theory (SAPT) to predict the dominant energy component and the nature of the N···Cl interaction. Halogen bonding plays an important role in liquid crystals, polymerization, crystal engineering, and biomedical applications. This interaction can be tuned systematically to design novel materials and pharmaceutical ligands with specifically desired properties. First-principles calculations show how to use of Vs,max and heterolytic bond breaking energy as a tool to tune the strength of σ-hole and N···Cl halogen bonds.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/qua.25511

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