Fig. 1: Conceptual overview and notable examples.

a Representation of acetylene, vinylidene, and heavier analogs with germanium. b Selected examples of germanium-containing heavier vinylidenes. c Imino-NHC Ge(0) adduct/mesoionic germylene. d This work: an isolable monomeric germavinylidene. Tip = 2,4,6-iPr3C6H2, Ar* = 2,6-Dipp2C6H3, Dipp = 2,6-iPr2C6H3.