2-Diphenylphosphinoethyl)cyclopentadienyl complexes of zirconium (IV): synthesis, crystal structure and dynamic behaviour in solutionsстатьяИсследовательская статья
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Дата последнего поиска статьи во внешних источниках: 29 мая 2015 г.
Аннотация:The novel [h5:h1-(2-diphenylphosphinoethyl)cyclopentadienyl]trichlorozirconium (IV) 3 has been prepared via (2-diphenylphosphinoethyl)(trimethylsilyl)cyclopentadiene 2. The structures of an adduct of 3 with tetrahydrofuran (THF) 3b (two crystal modifications) and of an ionic complex derived from 3 and ZrCl4 {[h5:h1-(C5H4CH2CH2PPh2)ZrCl]2(m-Cl)3}+2[(ZrCl4)2(m-Cl)2]2- 4 have been determined by an X-ray analysis. The X-ray and NMR data prove the existence of a Zr-P intramolecular coordination in 3 both in solid state and in non-solvating media within a broad range of temperatures. In THF solution the flexible equilibrium between adducts of 3 with one (3b) and two (3c) molecules of THF has been observed by variable-temperature NMR spectroscopy. The synthetic route to the simplest unsymmetrically ligated zirconocene ()h5-C5H4CH2CH2PPh2)(h5-C5H5)ZrCl2 5 derived from 3 has also been elaborated.