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用ＸＰＳ技术表征了吲哚－３－羧酸与钕离子的配合物，结果表明吲哚酸分子通过羧基的两个氧以双齿配位的形式与钕离子形成配合物；加入含氮的中性配体邻菲咯啉后，它们的配位形式明显改变。配位的３个吲哚酸分子中有部分（１或２）仍以双齿形式配位，其余分子以单齿形式配位。吲哚环中的氮未参与配位，邻菲咯啉中的两个氮原子参与配位，与钕离子形成五元环。
XPS was used to characterize the complexes of indole-3-carboxylic acid and neodymium ion. The results showed that the indole acid molecule formed a complex with neodymium ion through bidentate coordination between the two oxygen atoms of carboxyl group. The ligand ligand phenanthroline, their coordination form significantly changed. Part of the three indole acid molecules (1 or 2) still coordinate in bidentate form, and the remaining molecules coordinate in monodentate form. The nitrogen in the indole ring is not involved in the coordination. The two nitrogen atoms in the phenanthroline coordinate with each other and form a five-membered ring with the neodymium ion.