丙酮酸稀土配合物的红外光谱研究

研究了Ｙ，Ｌａ，Ｃｅ，Ｐｒ，Ｎｄ，Ｓｍ，Ｅｕ，Ｇｄ，Ｄｙ和Ｈｏ等１０种丙酮酸稀土配合物的ＦＴ－ＩＲ光谱；对４００～２０００ｃｍ＾－１的主要红外吸收谱峰进行了归属；２００～４－ｃｍ＾－１有３个随稀土原子序数递增峰位向高波数位移的谱带，可指认为ＲＥ－Ｏ伸缩振动吸收。红外光谱表明，丙酮酸以酸根形式采用螯合桥式三齿方式与稀土配位，某些谱峰有裂分或拓宽现象。配位键以离子键成分为主。

Studies on the Infrared Spectra of Rare Earth Complexes with Pyruvic Acid

FT IR spectra of La,Ce,Pr,Nd,Sm,Eu,Gd,Dy,Ho and Y complex with pyruvic acid have been studied.The principal infrared absorption peaks are assigned for the region 400-2 000 cm -1 .Three IR peaks in the region 200-400 cm -1 are shifted obviously to higher frequency with increasing of the atomic number of rare earth ion,these were believed to be RE O bond stretching mode absorptions.The IR spectra also indicated that the carboxylate groups have the form of chelation bridging tridentate to rare earth ions,i.e.,one of the carboxyl oxygens was shared between two adjacent metal ions,moreover,the splitting and broad bands are existed in IR spectra of the rare earth complexes.The RE O bond of the complexes is principally ionic.