Does a halogen bond require positive potential on the acid and negative potential on the base?

Abstract

It is usually expected that formation of a halogen bond (XB) requires that a region of positive electrostatic potential associated with a σ or π-hole on the Lewis acid will...

A Bidentate Antimony Pnictogen Bonding Host System

“…A strongly positive electrostatic potential frequently indicates the possibility for strong σ-hole-type interactions. [29] By rotation along the alkyne axes, the pnictogen bonding sites at the bidentate system can align suitably to bind guest molecules in a chelating fashion. This makes host 1 a versatile host system for Lewis base complexation.…”

“…The antimony atom exhibits three regions of distinctive positive electrostatic potential, each opposing the three substituents. A strongly positive electrostatic potential frequently indicates the possibility for strong σ‐hole‐type interactions [29] . By rotation along the alkyne axes, the pnictogen bonding sites at the bidentate system can align suitably to bind guest molecules in a chelating fashion.…”

Pd and Pt metal atoms as electron donors in σ-hole bonded complexes

“…[29][30][31][32] The pace of this work continues to accelerate even today. [33][34][35][36][37][38][39] Over the years, the investigations of these interactions have moved beyond halogen atoms, hence the development of analogous chalcogen or pnicogen bonds which engender robust study. 36,[40][41][42][43][44] The bulk of bonds of this type utilize either a lone pair of the nucleophile as the source of charge to be transferred, or a p-electron system, either localized as in ethylene, or aromatic.…”

“…[33][34][35][36][37][38][39] Over the years, the investigations of these interactions have moved beyond halogen atoms, hence the development of analogous chalcogen or pnicogen bonds which engender robust study. 36,[40][41][42][43][44] The bulk of bonds of this type utilize either a lone pair of the nucleophile as the source of charge to be transferred, or a p-electron system, either localized as in ethylene, or aromatic. A new wrinkle in this bonding is the finding that there are occasions where metal atoms can serve as the electron source, despite their low electronegativity.…”

“…The pace of this work continues to accelerate even today. 33–39 Over the years, the investigations of these interactions have moved beyond halogen atoms, hence the development of analogous chalcogen or pnicogen bonds which engender robust study. 36,40–44…”