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Effect of phenyl group on the structure and formation of transitional alumina from Al (OPh)3

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Abstract

The structure of freshly prepared Al(OPh)3, its decomposition product, the hydrolyzed products and their structural evolution were investigated employing 27Al MAS NMR spectroscopy, PXRD, TGA/DTA/DSC/FTIR techniques. In the 27Al MAS NMR spectrum of the aluminium phenoxide, three signals with the chemical shift at 3.78, 21 and 45 ppm were observed. The chemical shift at 3.78 and 45 ppm revealed the presence of four and sixfold coordinated aluminum. The signal at 21 ppm corresponded to fivefold coordinated aluminium. When the aluminium phenoxide was directly decomposed in air at 600 °C, it resulted in amorphous product as evidenced from the PXRD pattern. The observed signals with chemical shifts at 10.1, 42, 73.6 ppm in the 27Al MAS NMR spectrum indicated the presence of 6, 5 and 4 coordination for the aluminium atoms suggesting disordered transitional γ-alumina to be the product. The hydrolysis studies of Al(OPh)3 with excess of water at 70 °C yielded bohemite (γ-AlOOH). The alumina obtained after dehydration at 600 °C was X-ray amorphous. The dehydrated product at 600 °C showed the presence of four and six coordinated aluminium atoms in the 27Al MAS NMR spectrum confirming it to be ordered γ-Al2O3. Crystalline γ-Al2O3 was obtained on further heating at 800 °C.

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Acknowledgments

The authors would like to record their sincere thanks to Department of Science and Technology, Government of India and University of Delhi for the financial support to carryout this work. Also thanks are due to Professor A.K. Ganguli and Professor A. Ramanan of Indian Institute of Technology (IIT, Delhi) for the use of XRD facility and to Indian Institute of Science, Bangalore, India for recording the 27Al MAS NMR.

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  1. Materials Chemistry Group, Department of Chemistry, University of Delhi, Delhi, 110 007, India

    Nobel Tomar & R. Nagarajan

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  1. Nobel Tomar
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  2. R. Nagarajan
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Correspondence to R. Nagarajan.

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Tomar, N., Nagarajan, R. Effect of phenyl group on the structure and formation of transitional alumina from Al (OPh)3 . J Sol-Gel Sci Technol 53, 293–299 (2010). https://doi.org/10.1007/s10971-009-2090-3

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