A neutral low-coordinate heterocyclic bismuth-tin species.

The reaction of distannadiazane bearing bulky (R)Ar*-groups ((R)Ar* = C6H2{C(H)Ph2}2R-2,6,4; R = iPr, tBu) with ECl3 (E = Sb, Bi) was studied resulting in the isolation of previously unknown N,N-bis(dichloropnictino)amines (3) and a novel heterocyclic carbenoid bismuth species (4) bearing a Bi((III)) and a Sn((IV)) center. The structure and bonding was investigated by means of X-ray structure elucidations and DFT calculations.