Preparation and spectroscopic characterization of two HoCl₃–galactitol complexes and one ErCl₃–galactitol complex
2011
Hua, Xiaohui | Pan, Qinghua | Yu, Lei | Xue, Junhui | Yang, Limin | Xu, Yizhuang | Zhao, Guozhong | Li, Weihong | Wang, Zheming | Wu, Jinguang | Liu, Kexin | Chen, Jia’er
The interactions between metal ions and hydroxyl groups of carbohydrates are important for their possible biological activities. Here two HoCl₃–galactitol complexes ([Ho(galac)(H₂O)₃)]Cl₃·0.5galac) (HoG(I)) and ([Ho₂(galac)(H₂O)₁₂)]Cl₆·2H₂O) (HoG(II))) and one ErCl₃–galactitol complex ([Er(galac)(H₂O)₃)]Cl₃·0.5galac)(ErG)) were prepared and characterized. The possible structures of HoG(I) and ErG were deduced from FTIR, elemental analysis, ESI-MS, FIR, THz and TGA results. It is suggested that Ho³⁺ or Er³⁺ is 9-coordinated with six hydroxyl groups from two galactitol molecules and three water molecules, and another galactitol molecule is hydrogen-bonded in HoG(I) and ErG and the ratio of metal to ligand is 1:1.5. The structure of HoG(II) was determined by FTIR and X-ray diffraction analyses. The results demonstrate that lanthanide ions with galactitol may form two compounds in a system and different topological structures can be obtained.
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