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• W2028532135 abstract "Mononuclear complexes of rhodium and of ruthenium, Rh(acac)(η2-C2H4)2 and cis-Ru(acac)2(η2-C2H4)2 (acac = C5H7O2−), were used as precursors to synthesize metal complexes bonded to zeolite β. Infrared (IR) and extended X-ray absorption fine structure (EXAFS) spectra show that the species formed from Rh(acac)(η2-C2H4)2 was Rh(η2-C2H4)2+, which was bonded to the zeolite at aluminum sites via two Rh−O bonds. Reaction of this supported rhodium complex with CO gave the supported rhodium gem-dicarbonyl Rh(CO)2+, which was characterized by two νCO bands in the IR spectrum, at 2048 and 2115 cm−1, that were sharp (fwhm of 2115-cm−1 band = 5 cm−1), indicating a high degree of uniformity of the supported species. Nearly the same result was observed (Liang, A. et al. J. Am. Chem. Soc. 2009, 131, 8460) for the isostructural rhodium complex supported on dealuminated HY zeolite, which was characterized by frequencies of the νCO bands that were 4 and 2 cm−1, respectively, greater than those characterizing the zeolite β-supported complex. This comparison indicates that the Rh atoms in Rh(η2-C2H4)2+ anchored on zeolite β were slightly more electron-rich than those on zeolite Y. This inference is supported by EXAFS results showing shorter Rh−C bonds in the zeolite β-supported rhodium ethene complex than in the zeolite Y-supported rhodium ethene complex. In contrast to these supported rhodium complexes, the zeolite β-supported ruthenium samples were shown by IR and EXAFS spectroscopies to consist of mixtures of mononuclear ruthenium complexes with various numbers of acac ligands; when CO reacted with the supported ruthenium complexes, the resultant ruthenium carbonyls were characterized by νCO spectra characteristic of both ruthenium dicarbonyls and ruthenium tricarbonyls." @default.
• W2028532135 created "2016-06-24" @default.
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• W2028532135 date "2010-01-21" @default.
• W2028532135 modified "2023-10-17" @default.
• W2028532135 title "Essentially Molecular Metal Complexes Anchored to Zeolite β: Synthesis and Characterization of Rhodium Complexes and Ruthenium Complexes Prepared from Rh(acac)(η²-C₂H₄)₂ and <i>cis</i>-Ru(acac)₂(η²-C₂H₄)₂" @default.
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• W2028532135 doi "https://doi.org/10.1021/jp909977n" @default.
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