On the quest for new mixed-metal mu-oxo-bridged complexes: Synthesis of compounds containing transition metal-oxygen main group metal motifs M-O-M-1 (M = Ti, Zr; M-1 = Al, Ga) without cyclopentadienyl ligands

摘要

The reaction of TiBz(4) (Bz = benzyl) with LAlMe(OH), L = (2,6-iPr(2)C(6)H(3)NC(Me))(2)CH, afforded LAlMe(mu-O)TiBz(3) (1) and [LAlMe(mu-O)](2)TiBz(2) (2), whereas the corresponding reaction with ZrBz(4) resulted only in the formation of the trinuclear species [LAlMe(mu-O)](2)ZrBz(2) (3). The reaction of (MeS2Ga(OH))(2). THF (Mes = 2,4,6-Me3C6H2) with Ti(NEt2)(4) yielded the cluster compound TiGa6O7(NEt2)(2)(MeS)(6) (4). All compounds have been characterized by elemental analysis, NMR spectroscopy, and mass spectrometry. Additionally, single crystal X-ray structure data of 1, 3, and 4 are reported, Compounds 1-4 show low catalytic activities in the polymerization of ethylene. Revisiting known mu-oxo-bridged complexes containing the M-O-M-1 (M = Ti, Zr, Hf; M-1 = Al, Ga) skeleton revealed that the application of polynuclear group 13 hydroxides and oxo bridged complexes possesses a potential for the preparation of new polyoxometal clusters.