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研究了香兰素（３甲氧基４羟基苯甲醛）对甲苯胺希夫碱及其金属配合物在３８００～２００ｃｍ－１范围的傅里叶变换红外光声光谱，对主要谱带进行了经验归属。结果表明，希夫碱稀土配合物分为（ＬｎＬ２Ｃｌ·３Ｈ２Ｏ）Ｃｌ２（Ｌｎ为Ｌａ，Ｃｅ，Ｐｒ，Ｎｄ，Ｓｍ，Ｅｕ，Ｇｄ，Ｄｙ；Ｌ为希夫碱配体）和（ＬｎＬ２Ｃｌ２·２Ｈ２Ｏ）Ｃｌ·Ｈ２Ｏ（Ｌｎ为Ｈｏ，Ｅｒ，Ｔｍ，Ｙｂ，Ｌｕ）二类。配合物中存在着由酚羟基形成的分子间氢键，金属与水分子形成的配位键在～４００ｃｍ－１，金属与希夫碱氮形成的配位键在～３３０ｃｍ－１。
The Fourier transform infrared photoacoustic spectroscopy of vanillin (3-methoxy-4-hydroxybenzaldehyde) p-toluidine Schiff base and its metal complexes in the range of 3800 ~ 200cm-1 was studied. Experience attribution. The results show that the Schiff base rare earth complexes are divided into (LnL2Cl · 3H2O) Cl2 (Ln is La, Ce, Pr, Nd, Sm, Eu, Gd, Dy; L is Schiff base ligand) and (LnL2Cl2 · 2H2O) Cl · H2O (Ln Ho, Er, Tm, Yb, Lu) two categories. There is an intermolecular hydrogen bond formed by phenolic hydroxyl in the complex. The coordination bond between metal and water molecule is ~ 400cm-1, and the coordination bond between metal and Schiff base nitrogen is ~ 330cm-1.