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.
稀土离子位于双硅酸根和八面体层之间，形成（8+3 ）配位的A（1）多面体和10配位的A（ 2 ）多面体。
The rare earth ions lie between the disilicate groups and the sheets of octahedra to form (8+3)-coordinated A(1)-polyhedra and 10-coordinated A(2)-polyhedra.
吡啶脲类配体因其既能够与过渡金属配位，又能与阴离子形成氢键作用，近年来备受化学家的关注。
Urea-based pyridyl ligands have drawn much attention in recent years due to their capacity of coordinating with metal ions by the pyridyl group and binding anions by the urea functionalities.
按照已有的酶活性中心的金属-氨基酸侧链配位和空间关系，设计合成多齿配体，并使配体和金属离子通过配位作用形成配合物。
They are designed according to the special relations and coordination of metal-amino acid side chain in the active centre in known enzymes.
研究发现，这些配合物的中心离子都采用了六配位，形成了八面体构型。
The study found that the central ion of these complexes have adopted the six-coordinated, forming octahedral geometry.
镍离子与两个丁二酮肟配体上的四个氮原子和两个甲酸根离子上的碳原子配位进而形成八面体配位环境。
The Ni(II) cation has a distorted octahedral geometry defined by five N atoms from two dimethylglyoxime molecules and two O atoms from two formate anions.
用稀土金属离子通过形成配位结合来固着丝胶，制备了不同增重率的丝纤维，研究了增重丝纤维结构变化。
The structure changes of silk fiber with different weight gain, by using sericin fixing agent containing rare earth metal ion, were studied in this paper.
用稀土金属离子通过形成配位结合来固着丝胶，制备了不同增重率的丝纤维，研究了增重丝纤维结构变化。
The structure changes of silk fiber with different weight gain, by using sericin fixing agent containing rare earth metal ion, were studied in this paper.
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