H©Be4S4−: a superhalogen planar tetracoordinate hydrogen cluster

Abstract

Planar tetracoordinate hydrogen atom (ptH) is rare, with only a few examples theoretically proposed to date. Herein, we report a planar tetracoordinate hydrogen atom (ptH) as the global minimum H©Be₄S₄⁻ cluster which possesses dynamic stability. The ptH geometry is stabilized by 5c–2e multicentre bonding, and the cluster can be considered a “superhalogen” with high vertical detachment energy.