Trapping of tin(II) and lead(II) homologues of carbon monoxide by a benzannulated lutidine-bridged bisstannylene

The reaction of the benzannulated bisstannylene ligand 2 with Sn = O or Pb = O generated in situ gave the pincer complexes 3 and 4. Both complexes have been characterized by X-ray diffraction and multinuclear NMR spectroscopy. A divalent state has been found by Mossbauer spectroscopy for the tin atoms in complexes 3 and 4.