Do distibene (HSbSbH) and dibismuthene (HBiBiH) feature double bonding? A theoretical comparison with diphosphene (HPPH) and diarsene (HAsAsH)

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.