Synthesis and properties of bis(indenyl) derivatives of ytterbium and lutetium. Molecular structures of the complexes (C9H7)2Ln(μ-Cl)2Li(Et2O)2 (Ln = Yb, Lu) and [(C9H7)2YbCl2][Li(DME)3]

Abstract

The heterobimetallic bis(indenyl) chloride complexes of ytterbium and lutetium (C 9 H 7 ) 2 Ln(µ Cl) 2 Li(Et 2 O) 2 (Ln = Yb or Lu) were synthesized by the metathesis reaction of LnCl 3 with two equivalents of indenyllithium in diethyl ether. In the case of ytterbium, the analogous reaction in 1,2 dimethoxyethane afforded the ionic complex [(C 9 H 7 ) 2 YbCl 2 ] -[Li(DME) 3 ] + . The reaction of YbCl 3 with indenylpotassium in a molar ratio of 1 : 2 in THF is accompanied by reduction of the metal atom to give the bis(indenyl) derivative of Yb II , (C 9 H 7 ) 2 Yb(THF) 2 .

Half-Sandwich Lanthanide(III) Complexes Coordinated by Two α-Iminopyridine Radical Anions

“…Indene was purchased from Acros. LnCl 3 , (C 5 Me 5 )GdCl 2 (THF) 3 , (C 5 H 4 Me) 2 Yb(THF), (C 9 H 7 ) 2 Yb(μ-Cl) 2 Li(Et 2 O) 2 , and N -2,6-diisopropylphenylimino-2-pyridine were prepared according to literature procedures. All other commercially available chemicals were used after the appropriate purification.…”

Synthesis, Characterization, and Structures of Divalent Europium and Ytterbium N,N-Dimethylaminodiboranates

“…21 For example, reactions of europium(III) halides with bulky cyclopentadienide anions or of europium(III) metallocene halides with alkyllithium reagents can afford organometallic compounds of Eu II . [22][23][24][25] The Yb III complex [(C 5 H 4 Me) 2 -YbMe] 2 slowly reduces to the corresponding (C 5 H 4 Me) 2 Yb complex upon being heated to 80 °C or photolyzed in toluene. 26 The reactions of Ln[N(SiMe 3 ) 2 ] 3 (μ-Cl)Li(THF) 3 , where Ln = Eu or Yb, with indenes or fluorenes bearing pendant amine or ether functional groups, yield the corresponding lanthanide(II) metallocenes.…”

“…The reduction of Ln 3+ to Ln 2+ can be accomplished by comproportionation reactions involving Ln 0 metal; alternatively, such reductions can be achieved by the addition of an alkali metal. , There are also a few examples in which the reduction of Ln 3+ to Ln 2+ is effected by a reagent that serves both as a reductant and as a ligand for the metal center; this approach invariably involves the most easily reduced lanthanides Eu, Yb, and Sm . For example, reactions of europium(III) halides with bulky cyclopentadienide anions or of europium(III) metallocene halides with alkyllithium reagents can afford organometallic compounds of Eu II . − The Yb III complex [(C 5 H 4 Me) 2 YbMe] 2 slowly reduces to the corresponding (C 5 H 4 Me) 2 Yb complex upon being heated to 80 °C or photolyzed in toluene . The reactions of Ln[N(SiMe 3 ) 2 ] 3 (μ-Cl)Li(THF) 3 , where Ln = Eu or Yb, with indenes or fluorenes bearing pendant amine or ether functional groups, yield the corresponding lanthanide(II) metallocenes. − Similarly, treatment of the substituted benzyl complex Sm(CH 2 C 6 H 4 -2-NMe 2 ) 3 with the bulky cyclopentadiene C 5 (C 6 H 4 -4- n -Bu) 5 H (Cp BIG H) at 60 °C yields the Sm II product Sm(Cp BIG ) 2 …”