两种半乳糖醇氯化钆配合物的制备与表征

与羟基配位是金属离子的一种重要的存在形式. 我们得到了两种半乳糖醇氯化钆配合物, 其中一种为金属离子与配体为2:1的配合物，钆离子与半乳糖醇的三个羟基及六个水分子配位, 其它水分子以结晶水的形式存在, 氯离子不参加配位；另一种配合物根据红外, 元素分析, 差热热重, 远红外以及太赫兹光谱推测可能是钆离子与两个半乳糖醇分子的六个羟基以及三个水分子配位, 形成1:1配合物. 实验结果说明半乳糖醇与稀土离子之间可以形成多种配合物, 金属离子与糖的羟基存在着复杂的相互作用.

Preparation and Characterization of Two GdCl3-galactitol Complexes

Coordination of hydroxyl groups to metal ions is common in biosystems. Here two GdCl3-galactitol complexes have been prepared, one is 2GdCl3?C6H14O6?14H2O, in which Gd3+ is coordinated to three hydroxyl groups of galactitol and six water molecules, other water molecules are hydrogen-bonded and chloride ions do not coordinate to metal ions. It is possible that Gd3+ is 9-coordinated to six hydroxyl groups from two galactitol molecules and three water molecules, the ratio of metal to galactitol is 1:1 and maybe several water molecules are hydrogen-bonded in the second GdCl3-galactitol complex according to IR, elemental analysis, FIR, THz and TGA results. The experimental results indicate that two lanthanide-galactitol complexes can be obtained, which demonstrate the complexity of the interactions between metal ions and hydroxyl groups.