Simultaneous XRD-DSC Measurements of Water-2-Propanol at Sub-Zero Temperatures
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- NISHIMOTO Yuko
- Department of Chemistry, Faculty of Science, Kanagawa University
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- KANEKI Yoichi
- Department of Chemistry, Faculty of Science, Kanagawa University
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- KISHI Akira
- X-Ray Research Division, Rigaku Corporation
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A simultaneous low-temperature X-ray powder-diffractometric (XRD)-DSC technique was applied to the solid state and melting process of frozen aqueous solutions of 2-propanol. 1H NMR spectra were also obtained at low temperatures. The chemical shifts of the CH3 proton and the CH proton can be classified into four temperature regions: higher than -20°C, around -20°C, -50 to -20°C, and lower than -50°C. In the XRD data, five small diffraction peaks for 2 θ at 21.0°, 25.2°, 27.8°, 31.1° and 32.1° can be attributed to the peritectic, while five diffraction peaks at 22.5°, 24°, 25.6°, 33.4° and 39.8° can be attributed to ice; these peaks are due to the hexagonal form of ice, which disappears upon melting. However, the diffraction peak at 33.4° showed a different pattern than the other peaks due to hexagonal ice. These results indicate that the temperature dependence of the diffraction peak at 33.4° for 2θ is related to the formation of hydrogen bonds between 2-propanol and water. The simultaneous XRD-DSC technique was effective for investigating this water-alcohol mixture at low temperatures.
収録刊行物
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- Analytical Sciences
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Analytical Sciences 20 (7), 1079-1082, 2004
社団法人 日本分析化学会
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詳細情報 詳細情報について
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- CRID
- 1390001204257003264
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- NII論文ID
- 10013285853
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- NII書誌ID
- AA10500785
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- COI
- 1:CAS:528:DC%2BD2cXlvFKqt74%3D
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- ISSN
- 13482246
- 09106340
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- NDL書誌ID
- 7004299
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- PubMed
- 15293406
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
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- PubMed
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