Aluminum alkoxide chemistry revisited:  synthesis, structures, and characterization of several aluminum alkoxide and siloxide complexes

Wengrovius, Jeffrey H.; Garbauskas, M. F.; Williams, Elizabeth A.; Goint, Rose C.; Donahue, P. E.; Smith, Joanne F.

doi:10.1021/ja00265a024

Cited by 139 publications

(110 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The Al 4 O 6 core of 1 is also present in compound 2. The ethoxide groups do not redistribute in the presence of tri(phenyl)silanol as observed when an aluminum alkoxide and silanol are combined [18]. Compound 2 hydrolyzed upon exposure to air to form the hydroxide derivative [Al{µ-OH) 2 Al(OSiPh 3 ) 2 } 3 ] (3) (Scheme 1).…”

Section: Resultsmentioning

confidence: 99%

Ambient‐Condition nano‐Alumina Formation Through Molecular Control

Wang¹,

Bhandari²,

Mitra³

et al. 2005

Zeitschrift anorg allge chemie

View full text Add to dashboard Cite

Abstract. When toluene solutions of the tetrametallic compound, [Al{µ-OEt) 2 AlMe 2 } 3 ] (1), are stirred in air at room temperature, pure amorphous nanoparticulate Al 2 O 3 precipitates. The average particle size is 17.7 ± 7.4 nm. The tetrametallic core of 1, having the correct stoichiometry for alumina (2Al 2 O 3 ) appears to act as a template or nucleating site for the formation of alumina rather than the expected products of formula, AlOOH. The stability of the Al 4 O 6 core of 1 was tested by combining it with six equivalents

show abstract

Section: Resultsmentioning

confidence: 99%

Ambient‐Condition nano‐Alumina Formation Through Molecular Control

Wang¹,

Bhandari²,

Mitra³

et al. 2005

Zeitschrift anorg allge chemie

View full text Add to dashboard Cite

show abstract

“…In this work, we expand this work on aluminum alkoxides modified by reaction with b-ketoesters. Whereas the influence of the alkoxo or siloxo group on the oligomerization and structure of acac-substituted (acac = acetylacetonate) aluminum alkoxides or siloxides was studied in detail [5], this is not the case for variations of the ester OR groups in b-ketoesterate derivatives (b-ketoesterate = anion of b-ketoester). Since the bonding of b-ketoesterate ligands to the metal center is inherently asymmetrical (contrary to b-diketonate derivatives), because of the different electronic influence of the alkyl and OR substituents at the carbonyl carbon atoms, differences can be anticipated.…”

Section: Introductionmentioning

confidence: 99%

Modification of aluminum alkoxides with β-ketoesters: new insights into formation, structure and stability

Lichtenberger

Puchberger

Baumann

et al. 2009

J Sol-Gel Sci Technol

View full text Add to dashboard Cite

Pr) 2 (b-ketoesterate)] 2 derivatives are asymmetrically substituted dimers with one octahedrally and one tetrahedrally substituted aluminum atom, bridged by two isopropoxo groups, whereas the Al(b-ketoesterate) 3 derivatives are monomers with octahedrally coordinated aluminum. Transesterification as a possible side reaction was only observed at elevated temperatures for Al(tert-butyl acetoacetate) 3 in the presence of liberated iso-propanol.

show abstract

“…About 1.5 ml of EAA were added to the sonicated, alcoholic alkoxide using a previously dried pipette. Continuous sonication under 28 C conditions for about 1200 s was performed to complete the chelation process, which occurs at room temperature, as reported in the literature [8,9,13]. Totally, nine such batches were prepared.…”

Section: Preparationmentioning

confidence: 99%

Gellability zone for aluminium alkoxides

Haridas

Bellare

1999

Ceramics International

View full text Add to dashboard Cite

Ethyl acetoacetate modi®ed aluminium sec-butoxide can be hydrolysed and gelled with alkaline, neutral or acidic media within a pH range of 3.0±8.5. Alumina precipitation occurs if pH values at any point in the sol±gel transition are outside this range. Nine dierent gelling agents have been evaluated for pH dependence of gel point. Based on stoichiometric considerations, only those systems with a pH of 5.7±7.7 at their gel points can be fully hydrolysed before gelling and the extent of hydrolysis is reduced with an increase in the acidity/basicity of the system. In NaOH/HNO 3 hydrolysed precursors, the extent of hydrolysis at the gel point is about 55%. An unhydrolysed precursor has a pH of 6.4 which increases rapidly as aluminium hydroxide formation begins and a pH of 5.7±7.7 for complete hydrolysis prior to gelling is only possible with weak acids, weak alkalis, surfactant solutions and standard buers. pH data in the sol-to gel-transition is measured for NaOH, NH 4 OH, soya-PC, Milli-Q water, a buer of pH 7.0, standard solution of Tris-HCl, phenol, acetic and nitric acid. Based on observations a pH dependent``gellability zone'' is proposed with the sol±gel-precipitate states existing at the inside±periphery±outside of this zone.

show abstract

Aluminum alkoxide chemistry revisited: synthesis, structures, and characterization of several aluminum alkoxide and siloxide complexes

Cited by 139 publications

References 0 publications

Ambient‐Condition nano‐Alumina Formation Through Molecular Control

Ambient‐Condition nano‐Alumina Formation Through Molecular Control

Modification of aluminum alkoxides with β-ketoesters: new insights into formation, structure and stability

Gellability zone for aluminium alkoxides

Contact Info

Product

Resources

About