EXAFS Spectroscopy of the Alkoxide Precursor Zr(O n Bu)4 and its Modification in Solution |
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| Authors: | Matthias Bauer Christoph Gastl Christoph Köppl Guido Kickelbick Helmut Bertagnolli |
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| Affiliation: | (1) Institute of Physical Chemistry, University of Stuttgart, D-70569 Stuttgart, Germany;(2) Institute of Materials Chemistry, Technical University Vienna, A-1060 Wien, Austria |
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| Abstract: | Summary. The molecular structure of the transition metal alkoxide Zr(OnBu)4 in toluene and its modification by addition of i-propanol, tetrahydrofurane, and the coordinating ligand pentane-1,3-dione (Hacac) were investigated by extended X-ray absorption fine structure (EXAFS) and X-ray absorption near edge structure (XANES) spectroscopy. Zr(OnBu)4 dissolved in toluene forms dimers. It was proved that cluster size is a function of the number of added equivalents ligand. In contrast, the addition of i-propanol or tetrahydrofurane caused no structural changes observable by EXAFS spectroscopy. A detailed discussion of the structural models is given in terms of possible alternatives and errors within the EXAFS analysis. |
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| Keywords: | . EXAFS spectroscopy Transition metal alkoxides Aggregation Structure elucidation. |
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