Bis(phenylethynyl)hafnocene as an Organometallic Chelate Ligand

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Abstract
The application of (η5-C5H4SiMe3)2Hf(C≡CPh)2 (1) as an organometallic chelate ligand towards different organometallic building blocks will be discussed. 1 reacts with Ni(CO)4 (2) or Co2(CO)8 (4) to yield {(η5-C5H4SiMe3)2Hf(C≡CPh)2}M(CO) (M = Ni: 3, M = Co: 5) and (η5-C5H4SiMe3)2Hf(C≡CPh) [μ-(η2-C≡CPh)Co2(CO)6] (6). In 6 one of the two phenylethynyl units is η2-side-on coordinated to Co2(CO)6 forming a 1,2-dicobaltatetrahedrane unit. However, the reaction of 1 with Fe2(CO)9 (7) affords (η5-C5H4SiMe3)2Hf[(η2-C≡CPh)Fe(CO)4]2 (8), a compound, in which both of the phenylethynyl ligands are η2-side-on coordinated to Fe(CO)4 complex fragments. All new synthesized compounds have been characterized by analytical and spectroscopic data. Additionally, the structure of 3 was established by X-ray diffraction study.

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