合成了四个锌一铕(或铽)异金属双核配合物【znEu(L’)z(NOa)sPy】·2Py·THF(1)、【ZnTb(L’)2(NO。)。Py】.Py·EtOH·2HzO(2)(HL1-1-M2-(2-羟基-3-甲氧基苯基)苯并咪唑:Py=吡啶)和【znEu(L2)2(NOs)aPy】·Py·H20(3)、[ZnTb(L2)2(NOs)sPy】·Py·H2O(4)(HL2=1-M2-(2-羟基-3-甲氧基-5-溴苯基)苯并咪唑:Py=吡啶),其中1、2、3是单晶态。化合物4则为多晶样品:通过单晶X射线衍射、元素分析、傅里叶变换红外光谱和电喷雾质谱对化合物进行了表征.化合物的紫外.可见吸收光谱、荧光激发和发射光谱表明配体的激发态能量有效传递到配合物中的镧系金属离子中,含有铽(111)离子的配合物发射出其特征发射光谱,而含有铕(Ⅲ)离子的配合物由于其它去活方式,没有辐射出铕(…)离子的特征发射光谱.
Four isostructural heterobinuclear Zn-Ln (Ln=Eu or Tb) complexes are prepared through the self-assembly of benzimidazole derivatives 2-(2-hydroxy-3-methoxyphenyl)benzimidazole (HL1) or 2-(5- bromo-2-hydroxy-3-methoxyphenyl)benzimidazole (HL2) with Zn(CH3COO)2.2H20 and Eu(NO3)3- 6H20 or Tb(NO3)3 · 6H2O. The complexes are characterized by single-crystal X-ray diffraction, Fourier transform infrared (FTIR) spectroscopy, elementary analysis, and electrospray ionization mass spectrometry (ESI- MS). Three of the complexes form single crystals, while the fourth is polycrystalline. UV-Vis absorption, excitation and emission spectra of the Tb3*-based complexes reveal strong, characteristic luminescence from Tb3* with emissive lifetimes in the microsecond range. Therefore, Tb3* has been sensitized from the excited state of the ligands because of effective intramolecular energy transfer. The Eu3. complexes do not show characteristic emission because of deactivation by a different pathway.