异丙基桥连的希夫碱及其锰(Ⅲ)络合物催化剂的红外光谱

Studies on Infrared Spectra of Schiff Base Ligands and Their Mn(Ⅲ) Complex Catalysts with Isopropyl Bridge

研究了异丙基桥连的希夫碱及其锰（Ⅲ）络合物催化剂的红外光谱（３８００～１５０ｃｍ－１），对一些主要吸收谱带进行了经验归属。配体内氢键谱带出现在３４４６ｃｍ－１附近（以ＬＨ为例），νＣ－Ｏ谱带在１７２４ｃｍ－１附近（以ＬＣ为例，下同），νＣ＝Ｎ谱带在１６４９和１６２９ｃｍ－１附近，苯环的特征谱带在１６０１，１４７０和７５３ｃｍ－１附近，νＭｎ－Ｎ为主的复合振动在３６３ｃｍ－１附近，δＭｎ－Ｎ为主的复合振动在２４８ｃｍ－１附近，νＭｎ－Ｏ为主的复合振动在３３０ｃｍ－１附近，δＭｎ－Ｏ为主的复合振动在２７５ｃｍ－１附近，νＭｎ－Ｃｌ特征谱带在３０２ｃｍ－１附近。与苯基锰（Ⅲ）卟啉络合物相比，νＭｎ－Ｎ特征谱带向高波数发生了位移，而νＭｎ－Ｃｌ特征谱带向低波数发生了较大的位移。

The FTIR spectra(3 800～150 cm -1 ) of Schiff base ligands and their Mn(Ⅲ) complexes with isopropyl bridge were measured and investigated.The major bands were empirically assigned in comparison with a large number of previous results.It was found that the characteristic absorption bands of intra_molecular hydrogen bond of ligands are at ca 3 446 cm -1 ;in the ligands and complexes ν C-O is at ca 1 724 cm -1 , the ν C=N at ca 1 649 and 1 629 cm -1 ;the characteristic absorption bands of the phenyl ring at ca 1 601,1 470 and 753 cm -1 ;the vibrations coupling between the Mn—N stretching modes and the phenyl ring deformation at ca 363 cm -1 ,between the Mn—N and the phenyl ring deformation modes at ca 248 cm -1 ,between the Mn—O stretching modes and the phenyl ring deformation at ca 330 cm -1 ,between the Mn—N and the phenyl ring deformation modes at ca 275 cm -1 ;the ν Mn—Cl of the complexes were found at ca 302 cm -1 ;the ν Mn—N of the complexes shifted to higher wavenumbers and the ν Mn—Cl to lower wavenumbers than of the phenylporphyrin Mn(Ⅲ) complexes.