【摘要】 首次以2,4,6-三吡啶基三嗪(TPTZ)与Sm,Eu,Tb和Dy氯化物反应,合成四种单一稀土配合物以及Tb分别1∶1掺Gd,Y,La的三种异核配合物。经元素分析、稀土络合滴定、摩尔电导率、红外光谱、紫外光谱和差热-热重测定表明,配合物的组成分别为RE(TPTZ)Cl3.3H2O(RE=Sm,Eu,Tb,Dy)和Tb0.5Ln0.5(TPTZ)Cl3.3H2O(Ln=Gd,Y,La);TPTZ作为三齿配体与稀土离子配位,即中心环提供一个N原子,两个吡啶环分别提供一个N原子;配合物中3个水分子与稀土离子配位,1个Cl-在外界,2个在内界,为1∶1型电解质;配合物内外界可能为[RE(TPTZ)(H2O)3Cl2]Cl,稀土离子的配位数为8。配合物的荧光光谱测试表明,四种单一稀土配合物中,Tb配合物发光最强;三种1∶1掺杂异核Tb配合物荧光强度大于纯Tb配合物,表明Y3+,La3+和Gd3+都可以敏化Tb3+的发光,其中Gd3+的敏化作用最强,Y3+次之,La3+最差。更多还原

【Abstract】 The reaction of 2,4,6-tri(2-pyridyl)-1,3,5-triazine(TPTZ) with RECl3 in ethanol solution was studied.Seven solid coordination compounds of rare earth were synthesized.Their elemental analysis,rare earth complexometric titration,molar conduction,TG-DTA curve,IR spectra and UV spectra were studied.The results suggest that the composition of the complexes was RE(TPTZ)Cl3·3H2O(RE=Sm,Eu,Tb,Dy) and Tb0.5Ln0.5(TPTZ)Cl3·3H2O(Ln=Gd,Y,La),where TPTZ acts as a tridentate ligand with rare earth ion,the rare earth ion is eight-coordinate being bonded to the tridentate TPTZ,two Cl-anions and three water molecules,and the complexes-bounded may be [RE(TPTZ)(H2O)3Cl2]·Cl and [(Tb0.5Ln0.5)(TPTZ)(H2O)3Cl2]·Cl.They are all 1∶1 electrolytes in the DMF.The fluorescence spectra of the complexes were determined at room temperature.The results show that the fluorescence intensity of Tb3+ complex is the strongest among the four(Eu3+, Sm3+,Tb3+ and Dy3+) complexes.The lowest excitation state energy level of Tb3+ ion and the triplet state energy level of the ligand(TPTZ) match well.The absorbing energy of the ligand is effectively transferred to Tb3+ ion.The fluorescence intensity of terbium doped complexes(Tb3+ mixed by Gd3+,Y3+ and La3+) is stronger than that of terbium complex,showing that the fluorescence intensity of Tb3+ ion is raised by Gd3+,Y3+ and La3+ ions.更多还原