Synthesis and characterization of Zr(IV) and Y(III) complexes with monocyclopentadienyl ligands containing an additional site tethered by a coordinating 2,6-pyridine bridge. X-ray crystal structures of the zirconium complexes |
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Authors: | Gino Paolucci Manuela Vignola Bruno Pitteri |
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Institution: | a Dipartimento di Chimica, Università Ca' Foscari di Venezia, Dorsoduro 2137, I-30123 Venezia, Italy b I.C.I.S., C.N.R., Corso Stati Uniti 4, 35127 Padova, Italy |
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Abstract: | A new monocyclopentadienyl ligand containing an additional site tethered by a coordinating 2,6-pyridine unit has been prepared, rac-2-(1′-hydroxy-2′,2′-dimethylpropyl)-6-(1″,1″-dimethyl-cyclopentadienylmethyl) pyridine dilithium salt, LLi2 (rac-4) that is analogous to the ligands present in CGC. After reacting the dilithium salt of the ligand with ZrCl4 in a molar ratio of 1:1 in THF the complex LZrCl2·THF (rac-5) was obtained which forms an insoluble oligomeric species after the loss of THF upon purification. From the mater liquor two crystalline species of the formula LHZrCl3 (rac-6) and LH2ZrCl4·THF (rac-7) were isolated, whose X-ray crystal structures are reported. The reaction of LLi2 with Y(OTf)3 afforded the probably dimeric species LYOTf]2 (rac-8) from which the complex LY(CH2Si(CH3)3)]2 (rac-9) was obtained after reaction with LiCH2Si(CH3)3. |
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Keywords: | Zirconium complexes X-ray crystal structures Monocyclopentadienyl ligands |
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