Nucleophilic Substitution of Bis(cyclopentadienyl)-tin(II); Synthesis, Structure, and Solution Dynamics of trans-[(η3-Cp)Sn{μ2-NC(NMe2)2}]2

Only one Cp ligand is replaced when [Cp2Sn] reacts with LiN(NMe2)2 to give rise to 1, the first oligomeric cyclopentadienyltin(II) complex and the first iminotin(II) complex. In THF 1 exists as a 1:1 mixture of the cis and trans isomers, in toluene only the cis isomer is observed, and in the solid state only the trans isomer is found.