Metal Oxide Alkoxide Polymers: Part Ii. The Hydrolysis of Tantalum Pentaethoxide

Bradley, D. C.; Holloway, H.

doi:10.1139/v61-239

Cited by 20 publications

(6 citation statements)

References 4 publications

(4 reference statements)

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“…An all-glass ebullio~neter using a differential water thermometer was used as described in Part I1 (5). The alkoxides were freshly distilled i n vacz~o immediately prior to the ebulliometric hydrolysis.…”

Section: Ebz~lliometric Technique and Resultsmentioning

confidence: 99%

Metal Oxide Alkoxide Polymers: Part Iv. The Hydrolysis of Some Tantalum Alkoxides

Bradley¹,

Holloway²

1962

Can. J. Chem.

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Ebulliometric studies on the hydrolysis of tantalum pentaallcoxides Ta(OR)o, where R = Me, Prn, Bun, and Bu" have furnished important data on the polymeric nature of tantalum oxide allroxides. It is shown from the variation of number-average degrees of polymerization as a function of degree of hydrolysis that the polynlers conform to certain structural models. The structural models involve 6-co-ordinated tantalum.

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Section: Ebz~lliometric Technique and Resultsmentioning

confidence: 99%

Metal Oxide Alkoxide Polymers: Part Iv. The Hydrolysis of Some Tantalum Alkoxides

Bradley¹,

Holloway²

1962

Can. J. Chem.

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“…51 These results are also in good agreement with other results reported in the literature. 7,52 On the basis of the EXAFS investigations and considering the details on the nature and molecular complexity of tantalum alkoxides reported in literature, 5,47,49,50 the molecular structure proposed for Ta(OEt) 5 is depicted in Figure 4.…”

Section: Resultsmentioning

confidence: 99%

Structural Investigations on the Hydrolysis and Condensation Behavior of Pure and Chemically Modified Alkoxides. 1. Transition Metal (Hf and Ta) Alkoxides

et al. 2007

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Structural investigations on the hydrolysis and condensation behavior of hafnium and tantalum alkoxides were for the first time performed by means of X-ray absorption fine structure and Raman spectroscopy. The studies reveal that both of the alkoxides are dimeric in nature and instantaneously undergo hydrolysis and condensation reactions upon the addition of water. The results indicate that the chemical reaction of the alkoxides with acetylacetone occurs immediately with an increase from 6- to 8-fold coordination around the metal. As a consequence of the coordination by a bidentate ligand, hydrolysis and condensation reactions are hindered in solutions of the chemically modified Hf(OnBu)4 and Ta(OEt)5. Furthermore, the investigations demonstrate that the structure of metal alkoxides is not altered after mixing with prehydrolyzed silicon tetraethoxide, and even after 48 h, both of the species remain as separate entities in the mixture. The addition of water to this mixture starts the hydrolysis and condensation reactions instantaneously and leads to the formation of a M-O-M homocondensation product due to the different reactivity of the two alkoxides.

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“…[51 If equation [5] is to be identical with the least-squares equation n-I = 1.028-0.604x, it follows that 1.625-0.75~~ = 1.028. Hence a!…”

Section: Results a N D Discussionmentioning

confidence: 99%

“…= 0.796. A check on the theory is provided by the fact that the slope d(n-l)/dx of equation [5] is given by -(1.00-0.5~~). Substitution of the value for a!…”

Section: Results a N D Discussionmentioning

confidence: 99%

Metal Oxide Trialkylsilyloxide Polymers (Polytrialkylsiloxanometalloxanes): Part I. Titanium Oxide Trimethylsilyloxide Polymers

Bradley¹,

Prevedorou-Demas²

1963

Can. J. Chem.

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Tetrakis-(trin~ethylsilyloxy)-titanium Ti(OSiMea)4 has been hydrolyzed under controlled conditions in dioxane. The initial products of hydrolysis undergo facile disproportionation, e.g:3TizO(OSiMes)e -+4Ti(OSiMe3)4 $ polymeric Ti~Os(0SiiVIe~)~. Molecular weight determinations were made on the titanium oxide trimethylsilyloxide polymers (polytrimethylsiloxanotitanoxanes) obtained by thermal disproportionation. Structures have been suggested for the polymers on the basis of the variation of number-average degree of polyn~erization with the degree of hydrolysis.

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Metal Oxide Alkoxide Polymers: Part Ii. The Hydrolysis of Tantalum Pentaethoxide

Cited by 20 publications

References 4 publications

Metal Oxide Alkoxide Polymers: Part Iv. The Hydrolysis of Some Tantalum Alkoxides

Metal Oxide Alkoxide Polymers: Part Iv. The Hydrolysis of Some Tantalum Alkoxides

Structural Investigations on the Hydrolysis and Condensation Behavior of Pure and Chemically Modified Alkoxides. 1. Transition Metal (Hf and Ta) Alkoxides

Metal Oxide Trialkylsilyloxide Polymers (Polytrialkylsiloxanometalloxanes): Part I. Titanium Oxide Trimethylsilyloxide Polymers

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