1009586-82-6Relevant articles and documents
Tetraalkoxyaluminates of nickel(II), copper(II), and copper(I)
Veith, Michael,Valtchev, Kroum,Huch, Volker
, p. 1204 - 1217 (2008)
The syntheses and structural details of tetraisopropoxyaluminates and tetra-tert-butoxyaluminates of nickel(II), copper-(I), and copper(II) are reported. Within the nickel series, either Ni[Al(OiPr) 4]2·2HOiPr, with nickel(II) in a distorted octahedral oxygen environment, or Ni[Al(OiPr) 4]2·py, with nickel(II) in a square-pyramidal O4N coordination sphere, or Ni[(iPrO)(1BuO) 3Al]2, with Ni(II) in a quasi-tetrahedral oxygen coordination, has been obtained. Another isolated complex is Ni[ iPrO)3AlOAl(OiPr)3]·3py (with nickel(II) being sixfold-coordinated), which may also be described as a NiO species trapped by two Al(OiPr)3 Lewis acid-base systems stabilized at nickel by three pyridine donors. Copper(I) compounds have been isolated in three forms: [(iPrO) 4Al]Cu·2py, [(tBuO)4Al]Cu·2py, and Cu2[tBuO)4Al]2. In all of these compounds, the aluminate moiety behaves as a bidentate unit, creating a tetrahedrally distorted N2O2 copper environment in the pyridine adducts. In the base-free copper(I) tert-butoxyaluminate, a dicopper dumbbell [Cu-Cu 2.687(1) A] is present with two oxygen contacts on each of the copper atoms. Copper(II) alkoxyaluminates have been characterized either as Cu[tBuO)4Al]2, {Cu(iPrO)[( iPrO)4Al]}2, and Cu[tBuO) 3(iPrO)Al]2 (copper being tetracoordinated by oxygen) or as [iPrO)4Al]2Cu·py (pentacoordinated copper similar to the nickel derivative). Finally, a copper(II) hydroxyaluminate has been isolated, displaying pentacoordinate copper (O4N coordination sphere) by dimerization, with the formula {[( tBuO)4Al]Cu(OH)·py}2. The formation of all of these isolated products is not always straightforward because some of these compounds in solution are subject to decomposition or are involved in equilibria. Besides NMR [copper(I) compounds], UV absorptions and magnetic moments are used to characterize the compounds.
