Infrared-spectroscopic detection and distinction of indium cations of different oxidation states in zeolites |
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Authors: | R. Magdolna Mihályi Hermann K. Beyer Yanka Neinska Vesselina Mayrodinova Christo Minchev |
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Affiliation: | (1) Institute of Chemistry, Chemical Research Center, Hungarian Academy of Sciences, Pusztaszeri út, 59-67, H-1025 Budapest, Hungary;(2) Institute of Organic Chemistry, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria |
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Abstract: | In+ cations introduced by reductive solid-state ion exchange into zeolites (Y, ZSM-5, mordenite) and cationic InO+ species created by oxidation of the incorporated univalent cations were found to be detectable and distinguishable by IR spectroscopy using pyridine as probe molecule. Relatively weak interactions of In+ lattice cations with pyridine give rise, after degassing at temperatures not higher than 370 K, to typical bands at 1446 and 1599 cm−1. After oxidation to InO+, these bands are shifted to 1452 and 1610 cm−1, being significantly more resistant towards degassing. Because of restrictions in the accessibility of InO+ to pyridine, the respective bands are absent in the spectra of mordenite. |
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Keywords: | Indium lattice cations zeolites IR spectroscopy |
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