Abstract

Mixed aminotroponiminate ([ATI]−) cyclopentadienyl complexes were prepared using two different synthetic routes. Reaction of [[(iPr)2ATI]YCl2(THF)2]2 (1) with KCp* (Cp* = C5Me5) or Li[C5H3(SiMe3)2] affords [(iPr)2ATI]YCp2* (2a) and [(iPr)2ATI]Y[C5H3(SiMe3)2]2 (2b), respectively. Moreover, [(iPr)2ATI]YCp2* has also been obtained from the reaction of Cp2*Y(μ-Cl)2Li(OEt2)2 (3) and [(iPr)2ATI]K. The single crystal X-ray structure of [(iPr)2ATI]YCp2* shows that the steric demand of the [(iPr)2ATI]− ligand is somewhat similar to that of the well-known cyclopentadienyl group and diazadiene ligand. [(iPr)2ATI]Y[C5H3(SiMe3)2]2 shows a dynamic behavior in solution (1H NMR), which is essentially caused by rotation of the cyclopentadienyl group rather than by migration of the [(iPr)2ATI]− ligand.

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