物理化学学报 >> 2013, Vol. 29 >> Issue (03): 460-466.doi: 10.3866/PKU.WHXB201301071

热力学,动力学和结构化学 上一篇    下一篇

β-环糊精诱导的三氧化钼水溶性的增加

邵志成, 宋乐新, 滕越, 党政, 夏娟   

  1. 中国科学技术大学化学系, 合肥 230026
  • 收稿日期:2012-11-02 修回日期:2013-01-07 发布日期:2013-02-25
  • 通讯作者: 宋乐新 E-mail:solexin@ustc.edu.cn
  • 基金资助:

    国家自然科学基金(21071139)和中国科学技术大学国家同步辐射实验室资助项目

Increased Water Solubility of Molybdenum Trioxide Induced by β-Cyclodextrin

SHAO Zhi-Cheng, SONG Le-Xin, TENG Yue, DANG Zheng, XIA Juan   

  1. Department of Chemistry, University of Science and Technology of China, Hefei 230026, P. R. China
  • Received:2012-11-02 Revised:2013-01-07 Published:2013-02-25
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (21071139) and National Synchrotron Radiation Laboratory at University of Science and Technology of China.

摘要:

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.

关键词: β-环糊精, 三氧化钼, 分子-离子相互作用, 水溶性

Abstract:

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

Key words: β-Cyclodextrin, Molybdenum trioxide, Molecule-ion interaction, Water solubility

MSC2000: 

  • O641