Chromium Pentacarbonyl-Substituted Organotin(II) Cation Stabilized by p-Dimethylaminopyridine or Triphenylphosphane Oxide

The syntheses of the heteroleptic organostannylene chromium pentacarbonyl complexes [4-t-Bu-2,6-{P(O)(Oi-Pr)2}2C6H2(X)SnCr(CO)5] (2, X = ClO4; 3, X = OTf) and [4-t-Bu-2,6-{P(O)(Oi-Pr)2}2C6H2(L)SnCr(CO)5][ClO4] (4, L = p-Me2NC5H4N; 5, L = Ph3PO) are reported. In complex 2, as its toluene solvate 2·C7H8, and 3, as its toluene solvate 3·0.5C7H8, the perchlorate and triflate anions coordinate the tin atom at Sn–O distances of 2.170(3) and 2.178(3) A, respectively. In the complexes 4 and 5, however, the perchlorate anion is displaced from the tin atom by the 4-dimethylaminopyridine and triphenylphosphane oxide donor, respectively, to give salt-like solid-state structures. In addition to the single-crystal X-ray diffraction studies all compounds were characterized by multinuclear NMR and IR spectroscopy, electrospray mass spectrometry, and elemental analysis. DFT calculations with subsequent NBO analyses reveal the bonding of both the 4-dimethylaminopyridine and triphenylphosphane oxide to be donor–acceptor-lik...