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Infrared Spectroscopic Characterization of the Alumina Surface: 1. Infrared Spectra of Cr(CO)6Adsorbed at Different Surface Sites on γ-Alumina

✍ Scribed by E. Baumgarten; P. Dick

Publisher: Elsevier Science
Year: 1999
Tongue: English
Weight: 86 KB
Volume: 209
Category: Article
ISSN: 0021-9797
DOI: 10.1006/jcis.1998.5735

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✦ Synopsis

Infrared spectra of Cr(CO)6 adsorbed at different surface centers on gamma-alumina were investigated. The spectra of the probe complex revealed the existence of three types of strong Lewis centers and that of physisorbed Cr(CO)6. In the case of the physisorbed complex Oh symmetry was widely conserved, and addition to strong Lewis centers led to lowering of the symmetry. The assumption of C4v symmetry, caused by interaction of one CO group of the complex with a Lewis center, may explain the spectra. Approximate values for the integral extinction coefficients were determined. Copyright 1999 Academic Press.

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Infrared Spectroscopic Characterization of the Alumina Surface: 2. Properties of the Centers on γ-Alumina Surface as Observed with Cr(CO)6as a Probe

✍ E. Baumgarten; P. Dick 📂 Article 📅 1999 🏛 Elsevier Science 🌐 English ⚖ 87 KB

Using IR spectroscopic data of Cr(CO)6 adsorbed on different surface centers on gamma-Al2O3, we were able to calculate isotherms for adsorption on these centers. Linear relations were observed between spectroscopic data (position, extinction coefficient, and half-width values) of corresponding bands