Di(tert-butyl) phosphate complexes of aluminum: Precursors to aluminum phosphate xerogels and thin films
- Univ. of California, Berkeley, CA (United States). Dept. of Chemistry
- Univ. of Delaware, Newark, DE (United States). Dept. of Chemistry and Biochemistry
Aluminophosphates and related materials are useful in a number of applications, in particular as catalysts and catalyst supports. In addition, aluminophosphates have been shown to possess interesting ion exchange and adsorption properties. Reactions of HO(O)P(O{sup t}Bu){sub 2} with Al{sub 2}Me{sub 6} and [Al(O{sup i}Pr){sub 3}]{sub 4} gave the new molecular aluminum phosphate complexes [Me{sub 2}AlO{sub 2}P(O{sup t}Bu){sub 2}]{sub 2} (1) and [Al(O{sup i}Pr){sub 2}O{sub 2}P(O{sup t}Bu){sub 2}]{sub 4} (2), respectively. In the solid state, 1 exists as a centrosymmetric dimer consisting of two four-coordinate Al centers bridged by two phosphate groups. In the solid state 2 exists as a centrosymmetric tetramer in which the unique half of the tetramer consists of two aluminum atoms bridged by two di(tert-butyl)phosphate groups. The central part of the molecule contains a planar Al{sub 2}O{sub 2} four-membered ring containing two symmetry-related Al(1) atoms bridged by two {minus}O{sup i}Pr ligands. Solution-phase thermolyses of 1 and 2 in organic solvents led to the formation of transparent and opaque xerogels, respectively, after air-drying. The xerogel derived from 1 in 2-propanol had a surface area of 442 m{sup 2} g{sup {minus}1} after calcination to 600 C in air. Thin, transparent films of aluminum phosphate were prepared by chemical vapor deposition (CVD) using both 1 and 2 as molecular precursors.
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 682129
- Journal Information:
- Chemistry of Materials, Journal Name: Chemistry of Materials Journal Issue: 6 Vol. 11; ISSN CMATEX; ISSN 0897-4756
- Country of Publication:
- United States
- Language:
- English
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