钆(Ⅲ)天冬酰胺席夫碱配合物的EPR波谱  

EPR Spectra of Gadolinium Complexes with Asn Schiff Bases *

作　　者：易国斌[1] 陈德余[1] 

机构地区：[1]浙江大学化学系

出　　处：《Chinese Journal of Chemical Physics》1998年第3期267-271,共5页化学物理学报（英文）

基　　金：浙江省自然科学基金;浙江省分析测试基金

摘　　要：考察了两类新的Ｇｄ３＋氨基酸席夫碱配合物在不同温度下的多晶粉末和有机溶剂中的ＥＰＲ波谱，首次测定了水扬醛缩天冬酰胺席夫碱钆配合物在ＤＭＳＯ中变温ＥＰＲ特性，发现随温度降低线宽单调减小，纵向弛豫时间Ｔ１依次增大，用自旋晶格相互作用机理作了解释。EPR spectra of two new gadolinium complexes with amino Schiff bases in polycrystalline powder and in three organic solvents were investigated at different temperatures.EPR character of AS gedolinium complex in DMSO at variable temperatures were measured.It is found that an decrease of the line widths and an increase of crossing relaxation time with the decrease of temperature is caused by the spin-lattice interaction. The freezing EPR spectra of two complexes in various solvents at low temperature present the features of the U spectrum.The results show that the crystal field strength is different to same complex in various solvents:DMSO>DMF>CH 3OH,this is due to the solvent effect,we considered that the principal factor may be the dielectric constant of the solvents;besides,the crystal field strength is also different to various complexes in same solvent:complex 1>complex 2. The EPR spectra of two complexes in various solvents at room temperature exhibit the isotropic character.The relative relationship of the same complex in different solvents is Δ H pp(DMSO) >Δ H pp(CH 3OH) >Δ H pp(DMF) .The crystalline powder EPR spectra of two complexes at different temperature show the wider single peak.The spectral line shapes at low temperature are similar to those of samples at room temperature.Changes in spectral parameters g are not clear,but the line widths were broadened with the decrease of temperautre.

关 键 词：天冬酰胺席夫碱 钆 配合物 EPR波谱 

分 类 号：O614.339[理学—无机化学]