主要原因可能是形成配合物后电子由配体流向配位的中心阳离子，增加了电子的转移能力。
Thus could be resulted from the complexation by which increases the electron density of the metal ion through partial sharing of its positive charge with donor groups.
而要形成螯合物其中有一个因素非常重要，就是金属离子周围必须有足够的原子与它产生配位。
One of the important factors to form chelate is there should be enough atoms to coordinate with metal ion.
研究结果表明配体与稀土离子有较好的配位能力，并与稀土元素形成了双核配合物。
The result showed that ligand has good coordination ability with rare earth ions, and a binuclear complex was formed.
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