The Weakness of B-H...pi Interactions: Much Softer than a Hydrogen Bond

摘要

Recently, a new type of non-covalent interaction, the B-H...pi interaction, was introduced. Nevertheless, the unique determination of individual, non-covalent bond strengths in complex molecular systems is a nontrivial task with often controversial results. The utilization of generalized compliance constants (relaxed force constants) is proposed as unique bond-strength descriptors for classical and non-classical hydrogen bonds. The strength of recently proposed B-H...pi bonds is discussed.