香兰素对甲苯胺希夫碱稀土配合物的红外光声光谱

FTIRPAS OF RARE EARTH COORDINATED COMPOUNDS OF SCHIFF BASE DERIVED FROM VANILLIN AND pTOLUIDINE

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 spectra (FTIRPAS) of Schiff base derived from vanillin (3methoxy4hydroxybenzaldehyde) and ptoluidine and its rare earth coordinated compounds in the 3800—200cm-1 were measured and inverstigated.The coordinated compounds have two classes:[LnL2Cl·3H2O]Cl2 (Ln:La,Ce,Pr,Nd,Sm,Eu,Gd,Dy;L:Schiff base ligand) and [LnL2Cl2·2H2O] Cl·H2O(Ln:Ho,Er,Tm,Yb,Lu).In the coordinated compounds there is intermolecular hydrogen bond derived from phenolic hydroxy group.The bands at 400 and 300cm-1 are respectively assigned to bonds M—O(water) and M—N.