Citation: SHAO Zhi-Cheng, SONG Le-Xin, TENG Yue, DANG Zheng, XIA Juan. Increased Water Solubility of Molybdenum Trioxide Induced by β-Cyclodextrin[J]. Acta Physico-Chimica Sinica, 2013, 29(03): 460-466. doi: 10.3866/PKU.WHXB201301071
β-环糊精诱导的三氧化钼水溶性的增加
报道了由β-环糊精诱导的三氧化钼(MoO3)水溶性增加及其与β-环糊精浓度的相关性, 认为MoO3水溶性的增加是由于β-环糊精的加入导致了MoO3在水中的沉淀-溶解平衡向溶解方向移动. 几个独立的实验证明了由β-环糊精和钼酸根离子(MoO42-)组成的灰蓝色产物的形成. 结果表明: (1) X射线光电子能谱显示, 与MoO3相比, 灰蓝色产物中钼的3d5/2和3d3/2电子轨道的结合能有明显的降低; (2) 在灰蓝色产物中出现了213 nm处的强吸收带(Mo=O)和775 nm处的宽吸收峰(Mo―O); (3) 由于MoO42-的影响, β-环糊精的质子有很明显的低场漂移. 总之, 我们的工作不仅明确地揭示了β-环糊精和MoO42-之间的分子-离子相互作用, 同时揭示了这种相互作用在改善MoO3物理性质上的潜在应用价值.
English
Increased Water Solubility of Molybdenum Trioxide Induced by β-Cyclodextrin
Increased water solubility of molybdenum trioxide (MoO3) induced by β-cyclodextrin (CD), with solubility dependent on β-CD concentration is reported. The dynamic equilibrium established between MoO3 precipitation and dissolution shifted towards dissolution upon the addition of aqueous β-CD, to form a bluish-grey product. This was confirmed to be of β-CD and MoO42- by: (1) X-ray photoelectron spectroscopy showed decreased Mo 3d5/2 and 3d3/2 binding energies of the product compared with those of MoO3; (2) a strong band at 213 nm and new broad peak near 775 nm of the product were attributed to Mo=O and Mo―O bond absorption; (3) a downfield shift of β-CD protons due to the effect of MoO42- ions. An interaction between β-CD and MoO42- has been revealed and hints at the possibility of exploiting it for improving MoO3 physical properties
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Key words:
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β-Cyclodextrin
- / Molybdenum trioxide
- / Molecule-ion interaction
- / Water solubility
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