首页> 外文期刊>Acta Crystallographica, Section B. Structural Science >On hydrogen bonding in 1,6-anhydro-beta-D-glucopyranose (levoglucosan): X-ray and neutron diffraction and DFT study.
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On hydrogen bonding in 1,6-anhydro-beta-D-glucopyranose (levoglucosan): X-ray and neutron diffraction and DFT study.

机译:1,6-α-β-D-吡喃葡萄糖(Levoglucosan)中的氢键键合:X射线和中子衍射和DFT研究。

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摘要

The geometry of hydrogen bonds in 1,6-anhydro-beta-D-glucopyranose (levoglucosan) is accurately determined by refinement of time-of-flight neutron single-crystal diffraction data. Molecules of levoglucosan are held together by a hydrogen-bond array formed by a combination of strong O-H...O and supporting weaker C-H...O bonds. These are fully and accurately detailed by the neutron diffraction study. The strong hydrogen bonds link molecules in finite chains, with hydroxyl O atoms acting as both donors and acceptors of hydroxyl H atoms. A comparison of molecular and solid-state DFT calculations predicts red shifts of O-H and associated blue shifts of C-H stretching frequencies due to the formation of hydrogen bonds in this system.
机译:通过细化飞行时间中子单晶衍射数据来精确地确定1,6-α-β-D-吡喃葡萄糖(Levoglucosan)中的氢键的几何形状。 Levoglucosan的分子通过由强O-H ... O的组合形成的氢键阵列和支持较弱的C-H ... O键合。 这些通过中子衍射研究完全和准确地详细说明。 强氢键在有限链中的链接分子,羟基O原子用作羟H原子的供体和受体。 分子和固态DFT计算的比较预测O-H和C-H拉伸频率的相关蓝偏移的红色移位由于该系统中氢键的形成而引起的C-H拉伸频率。

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