Chromium Pentacarbonyl-Substituted Organotin(II) CationStabilized by p-Dimethylaminopyridine or TriphenylphosphaneOxide.

Thesyntheses of the heteroleptic organostannylene chromium pentacarbonylcomplexes [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, asits toluene solvate 3·0.5C7H8, the perchlorate and triflate anions coordinate the tin atom atSn–O distances of 2.170(3) and 2.178(3) Å, respectively.In the complexes 4and 5, however, the perchlorateanion is displaced from the tin atom by the 4-dimethylaminopyridineand triphenylphosphane oxide donor, respectively, to give salt-likesolid-state structures. In addition to the single-crystal X-ray diffractionstudies all compounds were characterized by multinuclear NMR and IRspectroscopy, electrospray mass spectrometry, and elemental analysis.DFT calculations with subsequent NBO analyses reveal the bonding ofboth the 4-dimethylaminopyridine and triphenylphosphane oxide to bedonor–acceptor-like with charge transfer from these donor moleculesto the tin atoms. [ABSTRACT FROM AUTHOR]