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Structural Characterization Of Al10O6IBu16(Μ-H)2, A High Aluminum Content Cluster: Further Studies Of Methylaluminoxane (Mao) And Related Aluminum Complexes, Feng-Jeng Wu, Larry S. Simeral, Anthony A. Mrse, Jan L. Eilertsen, Lacramioara Negureanu, Zhehong Gan, Frank R. Fronczek, Randall W. Hall, Leslie G. Butler
Structural Characterization Of Al10O6IBu16(Μ-H)2, A High Aluminum Content Cluster: Further Studies Of Methylaluminoxane (Mao) And Related Aluminum Complexes, Feng-Jeng Wu, Larry S. Simeral, Anthony A. Mrse, Jan L. Eilertsen, Lacramioara Negureanu, Zhehong Gan, Frank R. Fronczek, Randall W. Hall, Leslie G. Butler
Randall W. Hall
The first structurally characterized isobutyl-containing aluminoxane compound is presented. The Al10O6iBu16(μ-H)2 (I) cluster is produced from neat octakis-isobutyltetraluminoxane (Al4O2iBu8) at 80 °C in 6−8 h followed by slow crystallization. The crystal is triclinic (space group P1̄) with the molecule lying on an inversion center. This aluminoxane contains both nearly linear, 154(2)°, aluminum-bridging hydrides and three-coordinate aluminum sites. Solid-state 27Al magic-angle spinning (MAS) NMR experiments were done at 19.6 and 40 T (833 MHz and 1.703 GHz, 1H) and at 30−35 kHz spinning speeds, leading to the determination of the Cq and η values for the two four-coordinate Al sites and …