Bulletin of the Korean Chemical Society

  • 제21권10호
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  • Pages.1049-1051
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  • 2000
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  • 0253-2964(pISSN)
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  • 1229-5949(eISSN)
대한화학회 (Korean Chemical Society)
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Trimeric Chromium Oxyformate Route to Chromia-Pillared Clay

  • 발행 : 20001000
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초록

A chromia-pillared clay has been prepared by ion exchange type intercalation reaction between the sodium ion in montmorillonite and the trimeric chromium oxyformate (TCF) ion, and by subsequent heat-treatment. The structural and thermal properties have been systematically studied by thermal analysis, powder XRD, IR spec-troscopy, and XAS. The gallery height of~6.8 $\AA$ upon intercalation of the TCF ion suggests that the $Cr_3O$ plane is parallel to the aluminosilicate layers. Even though the basal spacing of TCF intercalated clay decreases slightly upon heating, the layer structure was retained up to $550^{\circ}C$ as confirmed by XRD and TG/DTA. Ac-cording to the EXAFS spectroscopic analysis, it is identified that the (Cr-Cr) distance of 3.28 $\AA$ between vertex-linked CrO6 octahedra in TCF splits into 2.64 $\AA$, 2.98 $\AA$, and 3.77 $\AA$ due to the face-, edge-, and corner-shared CrO6 octahedra after heating at $400^{\circ}C$, implying that a nano-sized chromium oxide phase was stabilized within the interlayer space of clay.

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  1. Formation of substituted N-oxide hydroxyquinolines from o-nitrophenyl Baylis–Hillman adduct: a new key intermediate intercepted by ESI-(+)-MS(/MS) monitoring vol.47, pp.47, 2006, https://doi.org/10.1016/j.tetlet.2006.09.037
  2. Palladium‐Catalyzed Suzuki–Miyaura Cross‐Coupling of Secondary α‐(Trifluoromethyl)benzyl Tosylates vol.129, pp.39, 2000, https://doi.org/10.1002/ange.201706631
  3. Palladium‐Catalyzed Suzuki–Miyaura Cross‐Coupling of Secondary α‐(Trifluoromethyl)benzyl Tosylates vol.56, pp.39, 2000, https://doi.org/10.1002/anie.201706631