Add time:08/11/2019         Source:sciencedirect.com

The homoleptic tris(substituted cyclopentadienyl)lanthanide(III) complexes [LnCpR3] (Ln=La (1), Ce (2), Pr (3), Nd (4), Sm (5), Gd (6), Tb (7), Dy (8), Er (9), Tm (10) and Yb (11)], [NdCpt3] (12), [CeCptt3] (13) and [NdCptt3] (14) [CpR=η5-C5H4{CH(SiMe3)2, Cpt=η5-C5H4(SiMe2But), Cptt=η5-C5H3(SiMe2But)2-1,3], have been synthesised by the reaction of the anhydrous lanthanide(III) halide with the appropriate sodium or potassium cyclopentadienide in THF. The characterisation of these complexes was established by 1H-, 13C- and 29Si-NMR spectroscopy (for 1–5 and 12–14), elemental analysis and mass spectrometry. The early paramagnetic lanthanide complexes 2–5, and 12–14 had very sharp 1H-NMR spectral signals, and the paramagnetic shifts were temperature-dependent. The molecular structures of 4, 10 and 13 have been determined by single crystal X-ray diffraction studies. The attempted syntheses of organoneodymium(II) and organothulium(II) complexes are also described.

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