
Polyhedron p. 1073 - 1080 (1998)
Update date:2022-08-04
Topics:
Okuda, Jun
Amor, Francisco
Du Plooy, Karen E.
Eberle, Thomas
Hultzsch, Kai C.
Spaniol, Thomas P.
Zirconium and hafnium complexes M(ηη1-C5Me4SiMe 2NR′)xCl(4-2x) (M = Zr, Hf; x = 1, 2; R′ = iPr, tBu) containing one or two linked amido-tetramethylcyclopentadienyl ligands C5Me4SiMe2NR′ have been synthesized by the reaction of the dilithium derivative Li2(C5Me4SiMe2NR′) with MCl4(THF)2. The crystal structure of the hafnium complex Hf(η5: η1-C5Me4SiMe2NiPr)2 has been determined by a single-crystal X-ray diffraction study and shows a C2-symmetric helical metallocene, in which the amido ligands are bonded as π-donor ligands with Hf - N bond lengths of 2.115(2) A. The isoelectronic heterobimetallic yttrium complex Li[Y(η5:η1-C5Me4SiMe 2NCH2CH2OMe)2] reacts with phenylacetylene to give the bis(phenylacetylide) derivative Li[Y{η5-C5Me4SiMe2NH(CH 2CH2OMe)}2(C=CPh)2].
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