New, convenient, and stereospecific method for the dehydration of alcohols. Thermal decomposition of magnesium, zinc, and aluminum alkoxides

Ashby, E. C.; Willard, G. Fred; GOEL, A. B.

doi:10.1021/jo01322a007

Cited by 48 publications

(32 citation statements)

References 4 publications

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“…In these steps it is believed that a 6-ring is formed as an intermediate, in which the total charge can easily be redistributed, leading to cleavage at the weakest bonds in the ring. This model was also suggested by Ashby et al [14] for the decomposition of metal alkoxides of magnesium, aluminium and zinc.…”

supporting

confidence: 52%

The pyrolytic decomposition of metal alkoxides(di-acetoxy-di-t-butoxy-silane, DADBS) during chemical vapour deposition of thin oxide films

et al. 1993

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In this study the effects of the nature of metal alkoxides on their vapour pressures and thermal decomposition chemistry are reported. The vapour pressure and the volatility of a metal alkoxide strongly depends on the steric effect of its alkoxy group.The thermal decomposition chemistry of one metal alkoxide (di-acetoxy-di-t-butoxysilane, DADBS) has been studied by mass spectrometry at temperatures between 423 and 923 K. The pyrolytic products were acetic acid anhydride and 2-methyl propene. The acetic acid anhydride is formed at temperatures above 473 K and 2-methyl propene is formed above 673 K by a P-hydride elimination mechanism. In these steps, a 6-ring intermediate is supposed to be formed. The silicon acid finally remaining is proposed to react by poly-condensation to SiOz coatings or powder.

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supporting

confidence: 52%

The pyrolytic decomposition of metal alkoxides(di-acetoxy-di-t-butoxy-silane, DADBS) during chemical vapour deposition of thin oxide films

et al. 1993

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“…Thermolysis of various alkylzinc alkoxides has been investigated before in the gas phase [35,36] as well as in the solid state. [37] The current contribution reports the solid-state synthesis in a carrier gas containing oxygen to obtain pure, single- 4 . This compound shows the optimum combination of low thermolysis temperature, high stability to oligomerization during storage, and good elimination of organic residues during thermolysis, and is available in large amounts.…”

Section: Preparation Of Zno From An Organometallic Precursormentioning

confidence: 99%

Zinc Oxide Nanoparticles with Defects

Ischenko

Polarz

Grote

et al. 2005

Adv Funct Materials

536

360

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Zinc oxide in the form of nanoscale materials can be regarded as one of the most important semiconductor oxides at present. However, the question of how chemical defects influence the properties of nanoscale zinc oxide materials has seldom been addressed. In this paper, we report on the introduction of defects into nanoscale ZnO, their comprehensive analysis using a combination of techniques (powder X‐ray diffraction (PXRD), X‐ray absorption spectroscopy/extended X‐ray absorption fine structure (XAS/EXAFS), electron paramagnetic resonance (EPR), magic‐angle spinning nuclear magnetic resonance (MAS‐NMR), Fourier‐transform infrared (FTIR), UV‐vis, and photoluminescence (PL) spectroscopies coupled with ab‐initio calculations), and the investigation of correlations between the different types of defects. It is seen that defect‐rich zinc oxide can be obtained under kinetically controlled conditions of ZnO formation. This is realized by the thermolysis of molecular, organometallic precursors in which ZnO is pre‐organized on a molecular scale. It is seen that these precursors form ZnO at low temperatures far from thermodynamic equilibrium. The resulting nanocrystalline ZnO is rich in defects. Depending on conditions, ZnO of high microstructural strain, high content of oxygen vacancies, and particular content of heteroatom impurities can be obtained. It is shown how the mentioned defects influence the electronic properties of the semiconductor nanoparticles.

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“…22,23 Moreover, each route has analogs in the pyrolysis of metal alkoxides in the condensed phase which proceeds via cyclic mechanisms to afford either alkenes or carbonyl compounds depending on the metal and the substituents. 24 Recently, also a decomposition of solid zinc alkoxides to hydroxy complexes has been reported. 25 …”

Section: Introductionmentioning

confidence: 99%

Consecutive fragmentations of the cubane-like zinc cluster [CH₃Zn(O-i-C₃H₇)]₄upon electron ionization

Schröder

Schwarz

Polarz

et al. 2005

Phys. Chem. Chem. Phys.

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New, convenient, and stereospecific method for the dehydration of alcohols. Thermal decomposition of magnesium, zinc, and aluminum alkoxides

Cited by 48 publications

References 4 publications

The pyrolytic decomposition of metal alkoxides(di-acetoxy-di-t-butoxy-silane, DADBS) during chemical vapour deposition of thin oxide films

The pyrolytic decomposition of metal alkoxides(di-acetoxy-di-t-butoxy-silane, DADBS) during chemical vapour deposition of thin oxide films

Zinc Oxide Nanoparticles with Defects

Consecutive fragmentations of the cubane-like zinc cluster [CH₃Zn(O-i-C₃H₇)]₄upon electron ionization

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New, convenient, and stereospecific method for the dehydration of alcohols. Thermal decomposition of magnesium, zinc, and aluminum alkoxides

Cited by 48 publications

References 4 publications

The pyrolytic decomposition of metal alkoxides(di-acetoxy-di-t-butoxy-silane, DADBS) during chemical vapour deposition of thin oxide films

The pyrolytic decomposition of metal alkoxides(di-acetoxy-di-t-butoxy-silane, DADBS) during chemical vapour deposition of thin oxide films

Zinc Oxide Nanoparticles with Defects

Consecutive fragmentations of the cubane-like zinc cluster [CH3Zn(O-i-C3H7)]4upon electron ionization

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Consecutive fragmentations of the cubane-like zinc cluster [CH₃Zn(O-i-C₃H₇)]₄upon electron ionization