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。
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 [（Tb0.5 Ln0.5 ） （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 Tb^3＋ complex is the strongest among the four （Eu^3＋ , Sm^3＋ , Tb^3＋ and Dy^3＋ ） complexes. The lowest excitation state energy level of Tb^3＋ ion and the triplet state energy level of the ligand （TPTZ） match well. The absorbing energy of the ligand is effectively transferred to Tb^3＋ ion. The fluorescence intensity of terbium doped complexes （Tb^3＋ mixed by Gd^3＋ , Y^3＋ and La^3＋ ） is stronger than that of terbium complex, showing that the fluorescence intensity of Tb^3＋ ion is raised by Gd^3＋ , y^3＋ and La^3＋ ions.
出处
《光谱学与光谱分析》
SCIE
EI
CAS
CSCD
北大核心
2009年第7期1929-1932,共4页
Spectroscopy and Spectral Analysis
基金
国家自然科学基金项目(20461002)
教育部春晖计划基金项目(Z2004-2-15029)
内蒙古自然科学基金项目(200711020203)资助
