Yttrium Polyphenylcyclopentadienyl Complexes with 1,3,5-Trimethyl-1,3,5-triazacyclohexane

The reaction of di-, tri-, and tetraphenylcyclopentadienylpotassium with yttrium chloride tetrahydrofuranate in the presence of 1,3,5-trimethyl-1,3,5-triazacyclohexane (Me3tach) gives complexes of the type [Cp'Y(Me3tach)Cl2] (Cp' = Ph2C5H3 (CpPh2) (I), Ph3C5H2 (CpPh3) (II), Ph4C5H (CpPh4) (III). The molecular structure of complexes I–III was established by X-ray diffraction (CCDC nos. 2406644 (I), 2406645 (II), 2406646 (III)). The main structural parameters of all of the obtained monocyclopentadienyl complexes were similar, irrespective of the number of phenyl substituents in the cyclopentadienyl ligand. According to NMR spectroscopy data, compounds I and III retained their structure in THF solution.