Seven coordinate aluminum in (benzo-15-crown-5)dichloroaluminum ethyltrichloroaluminate

Structural-chemical aspects of complexation in metal halide–macrocyclic polyether systems

“…The complex of AlEtCl 2 with benzo-15-crown-5 (15) has an analogous structure. 18 Complete hydration of complex 14 gave a compound with composition { 7 in which the metal atom is not coordinated by the oxygen atoms of the crown ether molecule and the individual structural units are linked to each other through a complex network of OH . .…”

Alumoxane Hydride and Aluminum Chalcogenide Hydride Compounds with Pyrazolato Ligands

“…Only one structurally characterized alumoxane hydroxide containing five‐coordinate Al atoms has been published 5c. Reports of compounds13 with coordination numbers five,13a,13b six,13c and even seven13d at Al have appeared in the literature, but these systems involve multichelating ligands such as a tetradentate Schiff base, N(CH 2 CH 2 OH) 3 , and crown ether. In compound 2 significantly longer bond lengths and smaller angles are observed at the five‐coordinate Al(1) compared to the four‐coordinate Al(2) (Figure 1).…”

Dichlorotetrakis(tetrahydrofuran)aluminium trichloroethylaluminate

“…It is thus legitimate to consider the redistribution reactions in EtAlCl 2 solution, leading to intermediates capable of [AlCl 2 (THF) 4 ][AlCl 3 Et] formation upon unsymmetrical dissociation (see scheme below). In a similar way, the EtAlCl 2 dimer has been previously treated with a pentadentate macrocyclic ether, yielding the analogous complex [AlCl 2 (benzo-15-crown-5)][AlCl 3 Et] (Bott et al, 1985). The interactions of monodentate THF with dimeric aluminium species were tested several times, with ambiguous conclusions.…”