title: Synthesis and Characterization of Heterobimetallic Al-O-Cu Complexes toward Models for Heterogeneous Catalysts on Metal Oxide Surfaces.
abstract: The β-diketiminato aluminum-monohydroxide and -dihydroxide were reacted with tetrameric (CuMes)4 (Mes = 2,4,6-Me3C6H2) to prepare Cu(I) complexes bearing the Al-O-Cu moiety. All complexes are characterized by elemental analysis, nuclear magnetic resonance, and single-crystal X-ray diffraction. The reaction of aluminum-monohydroxide LAlR(OH) (L = HC[C(Me)N(Ar)]2; Ar = 2,6-iPr2C6H3; R = Me, Et) with (CuMes)4 afforded the Cu(I) alumoxane [LAl(R)OCu·MesCu]2 (R = Me, 1; Et, 2). Using the aluminum-dihydroxide LAl(OH)2 as the precursor, the dimeric [LAl(OH)OCu·MesCu]2 (3) was isolated, bearing one reactive OH group on each Al center. When the reaction of LAl(OH)2 with (CuMes)4 was carried out at 70 °C, the dimeric octanuclear Cu(I) compound [LAl(OCu·MesCu)2]2 (4) was formed, where two residual Mes groups are located at the neighboring position on each of the two (OCu·MesCu)2 squares. Compound 4 can be alternatively obtained by reacting 3 with 1 equiv of (CuMes)4 to demonstrate the stepwise assembly of the Cu(I) alumoxanes.
authors.affiliation: †State Key Laboratory of Physical Chemistry of Solid Surfaces, National Engineering Laboratory for Green Chemical Productions of Alcohols-Ethers-Esters, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China.
authors.forename: Bin
authors.initials: B
authors.lastname: Li
authors.affiliation: †State Key Laboratory of Physical Chemistry of Solid Surfaces, National Engineering Laboratory for Green Chemical Productions of Alcohols-Ethers-Esters, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China.
authors.forename: Chunyan
authors.initials: C
authors.lastname: Zhang
authors.affiliation: ‡School of Chemistry and Chemical Engineering Centre for Environment and Water Resource, Central South University, Changsha 410083, China.
authors.forename: Ying
authors.initials: Y
authors.lastname: Yang
authors.affiliation: †State Key Laboratory of Physical Chemistry of Solid Surfaces, National Engineering Laboratory for Green Chemical Productions of Alcohols-Ethers-Esters, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China.
authors.forename: Hongping
authors.initials: H
authors.lastname: Zhu
authors.affiliation: §Institut für Anorganische Chemie, Georg-August-Universität, Tammannstraße 4, 37077 Göttingen, Germany.
authors.forename: Herbert W
authors.initials: HW
authors.lastname: Roesky