Alkylation of lanthanide alkoxides: Synthesis of [Ln(μ-OBut),(μ-Me)3-(AlMe2)3] (Ln = Pr, Nd or Y)

Interactions of Remote Alkyl Groups with Lanthanide Metal Centers: Synthesis, Characterization and Ligand Redistribution Reactions of Heterobimetallic Species Containing Trialkylaluminum Fragments

“…The La−C distances of 2.800(5) and 2.759(5) Å are slightly longer than the Sm−C distances observed in 2 [2.620(5) and 2.632(5) Å] and reflect both the larger size of lanthanum and a weaker agostic Ln ··· H−C interaction 20. By comparison, these bond lengths are longer than the La−C σ bonds in La[CH(SiMe 3 ) 2 ] 3 [2.515(9) Å]21 or (η 5 ‐C 5 Me 5 )La[CH(SiMe 3 ) 2 ] 2 [2.537(5) and 2.588(4) Å]22 but similar to the Nd−C(bridging) distance reported in Nd[(μ‐O t Bu)(μ‐Me)AlMe 2 ] 3 (2.784 (11) Å] 9. A feature common to the crystal structures of 1 , 2 and 4 is the presence of two distinct types of lanthanide‐oxygen bonds; the two longer bonds [2.387(3) and 2.367(3) Å in 1 ] are a result of the interaction of the AlR 3 groups with the phenoxide oxygen atoms (i.e.…”

Crystal structure of bis(μ2-methanolato-κO:κO)hexamethylbis(μ2-triphenylacetato-κO:κO′)bis(μ2-triphenylacetato-κ2 O,O′:κO)dialuminiumdilanthanum toluene tetrasolvate

“…Cg1, Cg2, Cg3 and Cg4 are the centroids of the C33-C38, C39-C44, C52-C57 and C19-C24 rings, respectively. Occhipinti et al, 2011;GEQMOF, GEQMUL, Fischbach et al, 2006b) Biagini et al, 1994;WAPYIV, WAPYOB, Evans et al, 1993a;WEHHAS, Evans et al, 1993b) Fischbach et al, 2003;MIMPED, Giesbrecht et al, 2002;MOQYOG, Gordon et al, 2002;PETMUX, Fischbach et al, 2006c) Giesbrecht et al, 2002;ROCHOH, Sommerfeldt et al, 2008) Evans et al, 1998). MIMPED is the only La structure among them.…”

Reactivity of Trimethylaluminum with Lanthanide Aryloxides: Adduct and Tetramethylaluminate Formation

“…As a consequence, there has been considerable interest in examining the interaction of trialkylaluminum reagents with rare-earth-metal alkoxide and aryloxide complexes. In the course of these studies various Ln−Al heterobimetallic complexes have been isolated. − Table summarizes structurally characterized derivatives according to the bonding mode of the organoaluminum moiety: that is, either Ln(μ-OR)(μ-alkyl)Al(alkyl) 2 or Ln(μ-OR) x Al(alkyl) y ( x = 1, 2; y = 2, 3; x + y = 4). Interestingly, the formation of a “peralkylated” Ln(μ-alkyl) x Al(alkyl) y fragment ( x + y = 4) has not yet been fully identified in such alkoxide-based binary systems.…”