Preparation And Character Investigation Of The Luminescent Complexes Of Rare Earth With Amino Acid And Imidazole

In this paper, the ten new coordination compounds of rare earths chlorate with acetylalanine and imidazole were prepared from absolute alcohol solution. The general formula of these compounds were identified as, by chemical and elemental analysis, RE(C5H9NO3)3(C3H4N2)Cl3 nH2O(when RE=La, Ce, Pr, Nd,n=4; when RE=Sm, Eu, Gd, Tb, Dy, Y, n=3),the title compounds were characterized by IR spectra, UV spectra, 1H NMR and 13C NMR spectra, molar conductance, solvency as well as X-ray powder diffraction.The thermal decomposition processes of these coordination compounds were studied by means of TG-DTG and DSC. The result of TG-DTG indicated that all of the compounds were of good stability. Their possible decomposing processes were also investigated: the first step can be assigned to the dehydration process of the compoundes, then the pyrolytic elimination reaction of carbonyl group and of the amino group in the biological ligand may take place consecutively or synchronously and the thermal dissociation the ligand imidazole from the compounds becomes corresponding rare earth salt, the final products of the thermal decomposition of the compounds were rare earth oxides or rare earth oxychloride. The kinetics of the thermal decomposition of the compounds was studied by non-isothermal thermogravimety. The non-isothermal kinetics data were analyzed by 5 different ways. The possible reaction mechanisms and the kinetics equation were investigated by comparing the kinetic parameters. The heat effect data of the whole thermal decomposition were obtained by DSC curve, the enthalpy values of dehydration and decomposition and entropy of activation of dehydration were also determined, the result of DSC was agreement with the conjectural decomposing processes by TG.The three-dimension fluorescence spectra of the title compounds were determined. It has been found that these compounds have good fluorescence properties, most compounds also have up conversion fluorescence. Their spectral properties were compared; theluminescent mechanism of the rare earth ions in the compounds was discussed. Using the OPO laser as excitated lamp, the fluorescence spectra of the compounds of Eu and Tb have also been studied, it has been discovered that the compounds all produce characteristic fluorescence of rare earth; moreover, the three-dimension room temperature phosphorescence spectra of the compounds of Gd and Tb have also been measured, it has been discovered that the compounds produce relative weak phosphorescence compared with fluorescence, besides the Gd compound even has up conversion phosphorescence.The effect of Sm compound on the callus growth and differentiation were investigated, in addition the action of the compound at various concentrations on the inhibition to microorganism in the MS medium. The effect of the compounds of Pn Nd and Y on tissue culture and rapid clone of saintpaulia ionantha wendl have also been studied.