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乙二胺四乙酸的晶体结构,已经利用对称元素的方法测定,晶体属单斜晶系,空间羣为C2h6,晶胞参数各为a=13.28?,b=5.64?,c=16.14?及β*=83°45′,每个单胞中有四个分子。原子间的距离已计算出来,并加经讨论。从晶体结构来看,乙二胺四乙酸的两个羧基与两个氮原子形成分子内部的氢键。因此,乙二胺四乙酸只表现出二元酸的性质,分子的结构式应写成:The crystal structure of ethylenediaminetetraacetic acid has been determined by the method of symmetry elements. The crystal is monoclinic, space group C2h6, with parameters a=13.28?,b=5.64?,c=16.14? and β*=83°45′. Each unit cell has four molecules. The interatomic distances are calculated and discussed.From the result of crystal structure, two carboxyls in the ethylenediaminetetraacetic acid form internal molecular hydrogen bonds with the two nitrogen atoms. Therefore, chemical characters of the ethylenediaminetetraacetic acid can only have those of a dibasic acid. The structure formular of molecule should be
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