A layered tungstic acid H2W2O7·nH2O with a double-octahedral sheet structure: Conversion process from an aurivillius phase Bi2W2O9 and structural characterization

Manabu Kudo, Hajime Ohkawa, Wataru Sugimoto, Nobuhiro Kumada, Zheng Liu, Osamu Terasaki, Yoshiyuki Sugahara

    Research output: Contribution to journalArticle

    42 Citations (Scopus)

    Abstract

    The conversion process of an Aurivillius phase, Bi2W2O9, into a layered tungstic acid by hydrochloric acid treatment has been investigated, and resultant H2W2O7·7H2O has been fully characterized. The c parameter of Bi2W2O9 [2.37063(5) nm] decreases to 2.21(1) nm in an acid-treated product dried at ambient temperature. The a and b parameters of Bi2W2O9 [a = 0.54377(1) nm and b = 0.54166(1) nm] also decrease slightly to a = 0.524(1) nm and b = 0.513(1) nm in the acid-treated product dried at ambient temperature, indicating structural changes in the ReO3-like slabs in Bi2W2O9 upon acid treatment. Drying at 120 °C leads to a further decrease in the c parameter [1.86(1) nm] with no notable change in the a and b parameters [a = 0.5249(2) nm and b = 0.513(2) nm]. The formation of an expandable layered structure is demonstrated by the successful intercalation of n-octylamine [interlayer distance 2.597(9) nm] and n-dodecylamine [interlayer distance 3.56(2) nm]. The compositions of the acid-treated products are determined to be H2W2O7·H2O typically with n = 0.58 for the air-dried product and n = 0 for the product dried at 120 °C. As a consequence, the composition of the layer is H2W2O7, and the decrease in the c parameter upon drying is ascribable to the loss of interlayer water. Scanning electron microscopy reveals no morphological change during acid treatment, which strongly suggests a selective teaching of the bismuth oxide sheets as a reaction mechanism. High-resolution transmission electron microscopy (HREM) observation of the acid-treated product shows consistency with a structural model for H2W2O7, derived from Bi2W2O9 through removal of the bismuth oxide sheets and contraction along the c axis. HREM observation also reveals that the WO6 octahedra arrangement changes slightly with acid treatment. A one-dimensional electron density map projected on the c axis for the product dried at 120 °C, H2W2O7, shows good consistency with that calculated for the structural model.

    Original languageEnglish
    Pages (from-to)4479-4484
    Number of pages6
    JournalInorganic Chemistry
    Volume42
    Issue number14
    DOIs
    Publication statusPublished - 2003 Jul 14

    Fingerprint

    acids
    Acids
    products
    interlayers
    bismuth oxides
    High resolution transmission electron microscopy
    expandable structures
    Drying
    drying
    ambient temperature
    Hydrochloric Acid
    transmission electron microscopy
    Intercalation
    tungstic(VI) acid
    Chemical analysis
    high resolution
    hydrochloric acid
    Carrier concentration
    intercalation
    Teaching

    ASJC Scopus subject areas

    • Inorganic Chemistry

    Cite this

    A layered tungstic acid H2W2O7·nH2O with a double-octahedral sheet structure : Conversion process from an aurivillius phase Bi2W2O9 and structural characterization. / Kudo, Manabu; Ohkawa, Hajime; Sugimoto, Wataru; Kumada, Nobuhiro; Liu, Zheng; Terasaki, Osamu; Sugahara, Yoshiyuki.

    In: Inorganic Chemistry, Vol. 42, No. 14, 14.07.2003, p. 4479-4484.

    Research output: Contribution to journalArticle

    Kudo, Manabu ; Ohkawa, Hajime ; Sugimoto, Wataru ; Kumada, Nobuhiro ; Liu, Zheng ; Terasaki, Osamu ; Sugahara, Yoshiyuki. / A layered tungstic acid H2W2O7·nH2O with a double-octahedral sheet structure : Conversion process from an aurivillius phase Bi2W2O9 and structural characterization. In: Inorganic Chemistry. 2003 ; Vol. 42, No. 14. pp. 4479-4484.
    @article{fc8d104afea04ca9a00aa10419c300ba,
    title = "A layered tungstic acid H2W2O7·nH2O with a double-octahedral sheet structure: Conversion process from an aurivillius phase Bi2W2O9 and structural characterization",
    abstract = "The conversion process of an Aurivillius phase, Bi2W2O9, into a layered tungstic acid by hydrochloric acid treatment has been investigated, and resultant H2W2O7·7H2O has been fully characterized. The c parameter of Bi2W2O9 [2.37063(5) nm] decreases to 2.21(1) nm in an acid-treated product dried at ambient temperature. The a and b parameters of Bi2W2O9 [a = 0.54377(1) nm and b = 0.54166(1) nm] also decrease slightly to a = 0.524(1) nm and b = 0.513(1) nm in the acid-treated product dried at ambient temperature, indicating structural changes in the ReO3-like slabs in Bi2W2O9 upon acid treatment. Drying at 120 °C leads to a further decrease in the c parameter [1.86(1) nm] with no notable change in the a and b parameters [a = 0.5249(2) nm and b = 0.513(2) nm]. The formation of an expandable layered structure is demonstrated by the successful intercalation of n-octylamine [interlayer distance 2.597(9) nm] and n-dodecylamine [interlayer distance 3.56(2) nm]. The compositions of the acid-treated products are determined to be H2W2O7·H2O typically with n = 0.58 for the air-dried product and n = 0 for the product dried at 120 °C. As a consequence, the composition of the layer is H2W2O7, and the decrease in the c parameter upon drying is ascribable to the loss of interlayer water. Scanning electron microscopy reveals no morphological change during acid treatment, which strongly suggests a selective teaching of the bismuth oxide sheets as a reaction mechanism. High-resolution transmission electron microscopy (HREM) observation of the acid-treated product shows consistency with a structural model for H2W2O7, derived from Bi2W2O9 through removal of the bismuth oxide sheets and contraction along the c axis. HREM observation also reveals that the WO6 octahedra arrangement changes slightly with acid treatment. A one-dimensional electron density map projected on the c axis for the product dried at 120 °C, H2W2O7, shows good consistency with that calculated for the structural model.",
    author = "Manabu Kudo and Hajime Ohkawa and Wataru Sugimoto and Nobuhiro Kumada and Zheng Liu and Osamu Terasaki and Yoshiyuki Sugahara",
    year = "2003",
    month = "7",
    day = "14",
    doi = "10.1021/ic0206746",
    language = "English",
    volume = "42",
    pages = "4479--4484",
    journal = "Inorganic Chemistry",
    issn = "0020-1669",
    publisher = "American Chemical Society",
    number = "14",

    }

    TY - JOUR

    T1 - A layered tungstic acid H2W2O7·nH2O with a double-octahedral sheet structure

    T2 - Conversion process from an aurivillius phase Bi2W2O9 and structural characterization

    AU - Kudo, Manabu

    AU - Ohkawa, Hajime

    AU - Sugimoto, Wataru

    AU - Kumada, Nobuhiro

    AU - Liu, Zheng

    AU - Terasaki, Osamu

    AU - Sugahara, Yoshiyuki

    PY - 2003/7/14

    Y1 - 2003/7/14

    N2 - The conversion process of an Aurivillius phase, Bi2W2O9, into a layered tungstic acid by hydrochloric acid treatment has been investigated, and resultant H2W2O7·7H2O has been fully characterized. The c parameter of Bi2W2O9 [2.37063(5) nm] decreases to 2.21(1) nm in an acid-treated product dried at ambient temperature. The a and b parameters of Bi2W2O9 [a = 0.54377(1) nm and b = 0.54166(1) nm] also decrease slightly to a = 0.524(1) nm and b = 0.513(1) nm in the acid-treated product dried at ambient temperature, indicating structural changes in the ReO3-like slabs in Bi2W2O9 upon acid treatment. Drying at 120 °C leads to a further decrease in the c parameter [1.86(1) nm] with no notable change in the a and b parameters [a = 0.5249(2) nm and b = 0.513(2) nm]. The formation of an expandable layered structure is demonstrated by the successful intercalation of n-octylamine [interlayer distance 2.597(9) nm] and n-dodecylamine [interlayer distance 3.56(2) nm]. The compositions of the acid-treated products are determined to be H2W2O7·H2O typically with n = 0.58 for the air-dried product and n = 0 for the product dried at 120 °C. As a consequence, the composition of the layer is H2W2O7, and the decrease in the c parameter upon drying is ascribable to the loss of interlayer water. Scanning electron microscopy reveals no morphological change during acid treatment, which strongly suggests a selective teaching of the bismuth oxide sheets as a reaction mechanism. High-resolution transmission electron microscopy (HREM) observation of the acid-treated product shows consistency with a structural model for H2W2O7, derived from Bi2W2O9 through removal of the bismuth oxide sheets and contraction along the c axis. HREM observation also reveals that the WO6 octahedra arrangement changes slightly with acid treatment. A one-dimensional electron density map projected on the c axis for the product dried at 120 °C, H2W2O7, shows good consistency with that calculated for the structural model.

    AB - The conversion process of an Aurivillius phase, Bi2W2O9, into a layered tungstic acid by hydrochloric acid treatment has been investigated, and resultant H2W2O7·7H2O has been fully characterized. The c parameter of Bi2W2O9 [2.37063(5) nm] decreases to 2.21(1) nm in an acid-treated product dried at ambient temperature. The a and b parameters of Bi2W2O9 [a = 0.54377(1) nm and b = 0.54166(1) nm] also decrease slightly to a = 0.524(1) nm and b = 0.513(1) nm in the acid-treated product dried at ambient temperature, indicating structural changes in the ReO3-like slabs in Bi2W2O9 upon acid treatment. Drying at 120 °C leads to a further decrease in the c parameter [1.86(1) nm] with no notable change in the a and b parameters [a = 0.5249(2) nm and b = 0.513(2) nm]. The formation of an expandable layered structure is demonstrated by the successful intercalation of n-octylamine [interlayer distance 2.597(9) nm] and n-dodecylamine [interlayer distance 3.56(2) nm]. The compositions of the acid-treated products are determined to be H2W2O7·H2O typically with n = 0.58 for the air-dried product and n = 0 for the product dried at 120 °C. As a consequence, the composition of the layer is H2W2O7, and the decrease in the c parameter upon drying is ascribable to the loss of interlayer water. Scanning electron microscopy reveals no morphological change during acid treatment, which strongly suggests a selective teaching of the bismuth oxide sheets as a reaction mechanism. High-resolution transmission electron microscopy (HREM) observation of the acid-treated product shows consistency with a structural model for H2W2O7, derived from Bi2W2O9 through removal of the bismuth oxide sheets and contraction along the c axis. HREM observation also reveals that the WO6 octahedra arrangement changes slightly with acid treatment. A one-dimensional electron density map projected on the c axis for the product dried at 120 °C, H2W2O7, shows good consistency with that calculated for the structural model.

    UR - http://www.scopus.com/inward/record.url?scp=0037898155&partnerID=8YFLogxK

    UR - http://www.scopus.com/inward/citedby.url?scp=0037898155&partnerID=8YFLogxK

    U2 - 10.1021/ic0206746

    DO - 10.1021/ic0206746

    M3 - Article

    C2 - 12844322

    AN - SCOPUS:0037898155

    VL - 42

    SP - 4479

    EP - 4484

    JO - Inorganic Chemistry

    JF - Inorganic Chemistry

    SN - 0020-1669

    IS - 14

    ER -