Synthesis, structural characterization and catalytic behavior of one-atom bridged fluorenyl cyclopentadienyl lanthanocene complexes with Cs- or C1-symmetry

A series of silylene- and methylene-bridged fluorenyl cyclopentadienyl ansa-lanthanocene chlorides, hydrocarbyls, amides and tetrahydroborates with Cs- or C1-symmetry have been synthesized successfully. X-ray structural studies have been carried out for these complexes. The hydrocarbyls and amides were applied for catalyzing the polymerization of methyl methacrylate and lactones.