Unexpected products in reactions of double-C,N-chelated diorganotin(IV) dibromide with cyclopentadienyl- and fluorenyllithium

From the reactions of bis{2-[(dimethylamino)methyl]phenyl}tin(IV) dibromide with two equivalents of cyclopentadienyl- or fluorenyllithium in THF, unexpected products [2-(CH3)(2)-NCH2C6H4](2)Sn(mu-eta(1):eta(1)-C5H4)(mu-O)Sn[2-(CH3)(2)NCH2C6H4](2) (2) and [2-(CH3)(2)NCH2C6H4](2)-Sn(OC13H9)Br (3), respectively, were isolated. These compounds were characterized by elemental analysis, NMR and X-ray diffraction techniques. The tin atoms in 2 are pseudo-tetrahedrally coordinated, each of them by two carbons of ligand, oxygen and the bridging carbon originated from mu eta(1):eta(1)-planar cyclopentadienyl moiety. The geometry of 3 is described as a distorted tetragonal pyramid with both ligand carbon atoms, bromine and one of nitrogen atoms in the base and oxygen atom in the vertex position.