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氨基多羧酸类配合物的配位数和结构不但与金属离子的半径、电荷和电子结构有关，而且还与氨基多羧酸类配体的形状和大小有关。本文报道了Ｎａ２［ＦｅⅢ（ｉｄａ）２］２·３Ｈ２Ｏ（ｉｄａ＝亚氨基二乙酸根）配合物的合成并测定了它的分子结构和晶体结构。具体结果如下：单斜晶系，Ｐ２１／ｃ空间群，ａ＝１５．６４８０（１０），ｂ＝１６．７８７０（１０），ｃ＝１０．３４７（２），β＝９０．７９０（１０）°，Ｖ＝２７１７．７（６）３，单位晶胞中的分子数为３，对于４７８９个独立的衍射点，它的Ｒ值为０．０３３３。其中两个配合物离子［ＦｅⅢ（ｉｄａ）２］－都是Ｎ和Ｎ顺位的变形八面体结构。由此可知具有对称电子结构（ｈｉｇｈ－ｓｐｉｎｄ５）的ＦｅⅢ与被看成是ｅｄｔａ（＝乙二胺四乙酸根）去掉了ＣＨ２－ＣＨ２的双ｉｄａ配体形成的配合物只能选择六配位八面体结构。
The coordination number and structure of the amino polycarboxylic acid complexes are not only related to the radius, charge and electronic structure of the metal ions, but also to the shape and size of the amino polycarboxylic acid ligands. This paper reports the synthesis of Na2 [FeⅢ (ida) 2] 2 · 3H2O (ida = iminodiacetate) complex and its molecular structure and crystal structure. The results are as follows: monoclinic, P21 / c space group, a = 15.6480 (10) , b = 16.7870 (10) , c = 10.347 (10) °, V = 2717.7 (6) 3, the number of molecules per unit cell is 3, and for 4789 individual diffraction spots it has an R value of 0.0333. Two of the complex ions, Fe III (ida) 2], are deformed octahedral structures of N and N orders. From this, it can be seen that the complex formed between FeIII with a symmetrical electronic structure (high-spind5) and the double ida ligand considered to be edta (= ethylenediaminetetraacetate) with CH2-CH2 removed can only select hexa-coordinated eight Body structure.