Scandium and lanthanum hydride complexes stabilized by super-bulky penta-arylcyclopentadienyl ligands
Résumé
Hydrogenolysis of the half-sandwich penta-arylcycopentadienyl-supported rare-earth metal dibenzyl complexes [(Cp-Ar5)Ln(p-CH2-C6H4-Me)(2)(THF)] (Cp-Ar5 = C5Ar5, Ar = 3,5-Pr-i(2)-C6H3; Ln = Sc, La) afforded a bimetallic scandium complex [(Cp-Ar5)Sc(H)(mu-OC4H9)](2) (2) with two terminal hydrido ligands, and a double-sandwich bimetallic lanthanum hydride complex [(Cp-Ar5)La(mu-H)](2) (4) bearing the reduced Cp-Ar5 ligand. DFT calculations were conducted to elucidate the reaction profiles.