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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Structure of amorphous NaCl–glucose system studied by X-ray diffraction and IR methods
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Structure of amorphous NaCl–glucose system studied by X-ray diffraction and IR methods

机译：X射线衍射和IR方法研究非晶态NaCl-葡萄糖体系的结构

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摘要

X-ray diffraction and diffuse reflection IR spectroscopic measurements have been carried out on amorphous NaCl–glucose mixtures, a-(NaCl)x(glucose)1-x, with x = 0, 0.05, 0.1 and 0.15, in order to obtain structural information on the intermolecular hydrogen-bonded interaction between glucose molecules affected by the presence of NaCl. The difference distribution function Δginter(r) was derived from the Fourier transform of the difference intermolecular interference term Δiinter(Q) between X-ray intermolecular interference terms observed from amorphous NaCl-glucose and pure glucose samples. A negative peak appears at r ≈ 2.5 A in the Δginter(r) observed for the 10 mol% NaCl sample, while, the Δginter(r) for the 15 mol% NaCl sample does not show pronounced negative peak. On the other hand, the IR spectra for the O–H stretching region (2300 ν 3800 cm-1) indicate that hydrogen bonds between glucose molecules are significantly collapsed in the samples containing 5–15 mol% NaCl. These results imply that the contribution from the Na+Cl- contact ion pair is dominated in the 15 mol% NaCl sample.
机译：X射线衍射和漫反射红外光谱测量已对非晶态NaCl-葡萄糖混合物a-（NaCl）x（葡萄糖）1-x进行了测试，其x = 0、0.05、0.1和0.15，以获得结构氯化钠的存在影响葡萄糖分子之间的分子间氢键相互作用的信息。差分布函数Δginter（r）是从非晶态NaCl葡萄糖和纯葡萄糖样品中观察到的X射线分子间干扰项之间的分子间干扰项Δiinter（Q）的傅里叶变换得出的。在10 mol％NaCl样品中观察到的Δginter（r）中，在r≈2.5 A处出现一个负峰，而在15 mol％NaCl样品中观察到的Δginter（r）没有显示出明显的负峰。另一方面，O–H拉伸区域（2300ν3800 cm-1）的红外光谱表明，在含有5–15 mol％NaCl的样品中，葡萄糖分子之间的氢键显着塌陷。这些结果表明，在15 mol％的NaCl样品中，来自Na + Cl-接触离子对的贡献占主导地位。

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