Abstract
The crystal and molecular structure of [(C 2H 5) 4N][Nb(η 5-C 5H 5){Sn(C 6H 5) 3}- (CO) 3] have been determined. The compound crystallizes in the space group P2 1/ n with a 1383.3(9), b 1520.6(18), c 1791.8(14) pm, and β 97.89(6)°. The NbSN bond length is 282.0(2) pm. The three CO groups and tin span a tetragonal plane parallel to the cyclopentadienyl ring. The Sn atom is in a greatly distorted tetrahedral environment: the angles at Sn are 116.8 (NbSnPh) and 101.3° (PhSnPh). The compound crystallizes with occluded solvent. Structure parameters are compared with those of other phenyltin derivatives of carbonyl transition metal complexes, and discussed in the context of the consistently high transition metal shielding observed for complexes containing a tin ligand.
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