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Volumn 122, Issue 33, 2000, Pages 8056-8066

Structure and bonding of a site-isolated transition metal complex: Rhodium dicarbonyl in highly dealuminated zeolite y

Author keywords

[No Author keywords available]

Indexed keywords

RHODIUM DERIVATIVE; ZEOLITE;

EID: 0034705982     PISSN: 00027863     EISSN: None     Source Type: Journal    
DOI: 10.1021/ja001209f     Document Type: Article
Times cited : (111)

References (67)
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    • Weber, W.A.1
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    • note
    • -1, indicating remnants of the acac ligand. However, such an infrared band would be obscured in the spectrum of the zeolite DAY-supported samples reported here by the absorption of the zeolite.
  • 14
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    • note
    • 2 from supported aggregates of rhodium metal, Miessner et al. observed peaks which correspond to acidic OH groups. Such peaks were not observed in the spectrum of our sample calcined at 300 °C. In contrast, the O-H stretching region characterizing our sample calcined at 120 °C, which had a higher concentration of surface water than that calcined at 300 °C, exhibits broad and muted OH features that do not allow clear identification of band positions (Figure 1 in Supporting Information).
  • 16
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    • note
    • 2 showed that the probabilities that Model III describes the data better than Model I are only 51% and 50% for samples calcined at 300 and 120 °C, respectively. Similar values, with no probability exceeding 61%, were obtained for similar comparisons discriminating between the other models. Thus, there is little basis in the data for choosing one of these models over the other, each fits the data well.
  • 19
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    • note
    • The effect of multiple scattering as a consequence of the near linearity of the Rh-C-O* moiety (a shorter apparent bond distance than the actual distance) was accounted for, as well as possible, by using the Ru-O* reference described below.
  • 20
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    • note
    • 3. 8
  • 21
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    • note
    • short contribution. For the remaining parameters of the models fitting the EXAFS spectra, the generally accepted error bounds (mentioned above) are larger than those determined by solely considering cross-correlation.
  • 22
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    • note
    • 0 values in the characterization of this absorber-backscatterer pair.
  • 26
    • 0343384569 scopus 로고    scopus 로고
    • note
    • asym to deduce the C-Rh-C angle, we obtained a value of 99°, although the angle employed in calculating the frequencies and intensities is 90.4°, as determined in the geometry optimization. This comparison shows that the estimate of the angle between two ligand molecules on the basis of the intensity ratio of the symmetric and antisymmetric vibrations is not accurate.
  • 32
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    • note
    • 13CO peaks were not found in the spectrum although they are evident in the spectra of the present samples.
  • 33
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    • note
    • We recognize that the vibrational frequency of adsorbed CO is affected by long-range fields, such as the Madelung field. However, the assertion that the local effects dominate the position of the VCO bands is supported by the close agreement (Table 1) between the experimental frequencies and those calculated using only a localized fragment of the zeolite structure to represent the support.
  • 34
    • 0343820267 scopus 로고    scopus 로고
    • note
    • 2 such a contribution was observed at about 2.5 Å. 5
  • 40
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    • note
    • 2(acac), is a square-planar 16-electron complex.
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    • (b) Perdew, J. P. Phys. Rev. B 1986, 33, 8822. Perdew, J. P. Phys. Rev. B 1986, 34, 7406.
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    • (b) Perdew, J. P. Phys. Rev. B 1986, 33, 8822. Perdew, J. P. Phys. Rev. B 1986, 34, 7406.
    • (1986) Phys. Rev. B , vol.34 , pp. 7406
    • Perdew, J.P.1
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    • Ph.D, Dissertation, University of Washington, 1996
    • (b) Ankudinov, A. Ph.D, Dissertation, University of Washington, 1996.
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    • U.S. Department of Commerce. National Bureau of Standards and the Joint Committee on Powder Diffraction Standards: Washington, DC
    • Donnay, J. D. H.; Ondik, H. M. Crystal Data Determinative Tables, 3rd ed.; U.S. Department of Commerce. National Bureau of Standards and the Joint Committee on Powder Diffraction Standards: Washington, DC. 1973; Vol. II, p C-4.
    • (1973) Crystal Data Determinative Tables, 3rd Ed. , vol.2
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    • Dissertation, Eindhoven University of Technology, The Netherlands, 1988
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* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.