Do distibene (HSb
SbH) and dibismuthene (HBi
BiH) feature double bonding? A theoretical comparison with diphosphene (HP
PH) and diarsene (HAs
AsH)
Abstract
Ab initio calculations suggest that the Sb and Bi atoms in group 15 form double bonded compounds, as do the lighter P and As atoms, unlike the heavier Sn and Pb in group 14; dibismuthenes are the heaviest example of double bonding between main group elements.