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By Bochmann M.

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The polymeric two-dimensional infinite network of the compound consists of the (C5H3CHTCHCH2CTCHC5H4)2Ho2Cl2 units, in which each holmium atom is coordinated by a monosubstituted 5-Cp group, a disubstituted 5-Cp group, and two bridging chlorine atoms. 342 Treatment of 2 equiv. of NaCpR (CpR ¼ (þ)neomenthylcyclopentadienyl) with anhydrous lanthanide trichlorides in THF at room temperature afforded the organolanthanide chlorides [CpR2Ln(-Cl)]2 (Ln ¼ Sm, Yb, Y, Lu). Single crystal X-ray diffraction studies of [CpR2Sm(-Cl)]2 and [CpR2Y(-Cl)]2 revealed that both compounds are chloro-bridged dimers, with the Ln2Cl2 plane being almost perpendicular to the plane described by the four cyclopentadienyl ring centroids.

343 The trichlorides of yttrium, samarium, and lutetium react with 2 equiv. 345 Reaction of 2 equiv. 346 The bis(substituted cyclopentadienyl)lanthanide(III) halides [LnCpR2(-Cl)]2 (Ln ¼ Pr, Nd, Sm, Dy, Tb, Y), [LnCptt2(-X)]2 (X ¼ Cl, Ln ¼ La, Nd; X ¼ I, Ln ¼ Tm), 1 and [Nd(CpR 2SiMe2)(-Cl)]2, and bis(substituted cyclopentadienyl)lanthanide(II) complexes LnCpR2(THF)2 (Ln ¼ Sm, Eu, Yb), YbCpt2(THF)2, LnCptt2(THF)2 (Ln ¼ Sm, Yb), LnCpR2(Ln ¼ Sm, Eu, Yb), YbCpt2, LnCptt2 1 (Ln ¼ Sm, Yb), and Yb(CpR 2SiMe2)(THF)2 [CpR ¼ C5H4CH(SiMe3)2, Cpt ¼ C5H4SiMe2But, Cptt ¼ C5H3(SiMe2But)2-1,3, CpR1 ¼ C5H3CH(SiMe3)2-3] have been synthesized from the appropriate LnCl3, TmI3, or LnI2 with the selected sodium or potassium cyclopentadienide.

The structure of [Cp02Nd(-OMe)2Li(DME)] contains one [Cp02Nd] fragment bound with Li ion by two OMe bridges. 381 [K{(-Cp)2Nd(-O-C6H3Me2-2,6)2}]n was obtained by the reaction of KCp with [Nd(OAr)3(THF)2]2 (Ar ¼ C6H3Me2-2,6) in THF. According to X-ray diffraction studies, in the complex [Cp2Nd(OAr)2]À anions are connected into a two-dimensional layered structure by Kþ cations bridged by arene and cyclopentadienyl rings. Each potassium atom connects four different [Cp2Nd(OAr)2]À anions and is surrounded by two bridging Cp groups and two bridging arenes.

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