Anomalous peak intensities in the EXAFS of polynuclear molybdenum compounds.
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概要
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EXAFS (Extended X-ray Absorption Fine Structure) experiments on various polynuclear molybdate and tungstate compounds revealed the unusual phenomenon that Mo–O peaks which should appear at around 1.9 Å in Fourier transforms of the EXAFS spectra for Mo<SUB>6</SUB>O<SUB>19</SUB><SUP>2−</SUP> and PMo<SUB>12</SUB>O<SUB>40</SUB><SUP>3−</SUP> are hardly discernible, while the tungstates and other molybdates give the metal–oxygen peaks normally. It is concluded that the Debye–Waller factors for the metal-bridging oxygen bonds in Mo<SUB>6</SUB>O<SUB>19</SUB><SUP>2−</SUP> and PMo<SUB>12</SUB>O<SUB>40</SUB><SUP>3−</SUP> are exceptionally large (≥0.08 Å). The shape of the Raman bands for the Mo<SUB>6</SUB>O<SUB>19</SUB><SUP>2−</SUP> pertaining to the vibration involving the bridging oxygens supports the large σ values estimated. EXAFS measurements were also performed for AsMo<SUB>12</SUB>O<SUB>40</SUB><SUP>3−</SUP>, SiMo<SUB>12</SUB>O<SUB>40</SUB><SUP>4−</SUP>, and PMo<SUB>12</SUB>O<SUB>40</SUB><SUP>3−</SUP>. The compounds with large Debye–Waller factors seem to be unstable against reductants.
- 公益社団法人 日本化学会の論文
著者
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MATSUBAYASHI Nobuyuki
National Chemical Laboratory for Industry
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Fukumoto Takao
Department Of Chemistry Graduate School Of Scinece Osaka University
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Miyanaga Takafumi
Department Of Advanced Physics Faculty Of Science And Technology Hirosaki University
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Watanabe Iwao
Department Of Anesthesilogy Takasaki National Hospital
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Fujikawa Takashi
Faculty Of Agriculture Shizuoka University
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Ikeda Shigero
Institute of Science and Technology, Ryukoku University
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Yokoi Kunihiko
Department of Chemistry, Osaka Kyoiku University
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Fukumoto Takao
Department of Chemistry, Faculty of Science, Osaka University
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