Organolanthanide and organoyttrium hydride chemistry. 9. Bis(1,3-dimethylcyclopentadienyl)yttrium complexes. Synthesis and x-ray crystallographic characterization of [(1,3-Me2C5H3)2Y(.alpha.-Me)]2, [(1,3-Me2C5H3)2Y(.mu.-H)]3, and [(1,3-Me2C5H3)2(THF)Y(.mu.-H)]2

Postmetallocene Lanthanide–Hydrido Chemistry: A New Family of Complexes [{Ln{(Me3Si)2NC(NiPr)2}2(μ‐H)}2] (Ln=Y, Nd, Sm, Gd, Yb) Supported by Guanidinate Ligands—Synthesis, Structure, and Catalytic Activity in Olefin Polymerization

“…The Y-Y distance in 11 (3.6825(5) ) are very close to that found in the complexes (1) ), [44] [Y( (8) ).…”

“…The Y-H-Y angles in the Y 2 H 2 -core are comparable to those in other dimeric m 2 -hydrido bridged yttrium complexes in bis(cyclopentadienyl) [41,44] , amidocyclopentadienyl [42,43] and bis(amidinate) [15] ancillary ligation. Unlike the lutetium ana-…”

Dinuclear Chlorido‐, Alkyl(chlorido)‐, and Hydridoyttrium Complexes Supported by μ‐Bridging‐Silyl‐Linked Bis(amidinate) Ligands

“…[17a,17c] The planar tetranuclear Y 2 H 2 core in 5 is symmetric and features unique geometric parameters: the Y-H (4) [24] [(1,3-Me 2 -C 5 H 3 ) 2 Y(thf)(µ-H)] 2 [2.03(7), 2.27(6); 3.68(1) Å], [25] [(2,4,7-Me 3 -C 9 H 4 ) 2 Y(µ-H)] 2 [2.09(4)-2.14(7) Å]. [26] [28] [Ln{(Me 3 Si) 2 NC(NcHex) 2 } 2 (µ-H)] 2 [120.1(2)°].…”

Synthesis, Structure, and Reactivity of Organometallic .pi.-Complexes of the Rare Earths in the Oxidation State Ln3+ with Aromatic Ligands

“…In addition t o bis(methylcyclopentadieny1)lanthanide methyl complexes four further types of methyl complexes with ancillary bis(l,3-dimethylcyclopentadienyl), 328 Ce (n = 0); Ln = Nd (n = 1) All compounds have been examined by spectroscopic means such as 'H-and I3C-NMR and IR techniques as well as by elemental analyses, so that little, if any, doubt exists concerning their compositions, despite the absence of structural data.…”