Homoleptic Complexes of Bisstannylenes with Nickel(0): Synthesis, X-Ray Diffraction Studies, and ¹¹⁹Sn NMR Investigations

The benzannulated bisstannylenes linked by a CH2C(CH3)2CH2 (3) or 1,3-(CH2)2C6H4 bridging unit (4) react with [Ni(cod)2] to give the intensely colored homoleptic Ni0 complexes 5 and 6. X-ray diffraction and 119Sn NMR studies for the complex of the bisstannylene with the CH2C(CH3)2CH2 linker 5 reveal the presence of four identical tin atoms. For the nickel complex 6 of the bisstannylene ligand, which contains a 1,3-(CH2)2C6H4 bridging unit, two types of tin atoms with different coordination environments were found both in solution and in the solid state.