【摘要】 合成了铽及掺荧光惰性镧、钆、钇的铽冠醚对苯二甲酸配合物。通过元素分析、摩尔电导及红外光谱推测出了配合物的组成;实验结果表明,半径大的稀土离子与18冠6的氧原子直接配位,而半径小的稀土离子则通过水分子配位;对苯二甲酸作为桥连配体连接两个稀土冠醚配合物。测定了配合物的荧光激发光谱和发射光谱,表明铽配合物发出较强的荧光。探讨了配合物中的传能过程,结果表明,配体能较好地将吸收的能量传递给T b3+,不发光稀土离子(L a3+、G d3+和Y3+)对发光稀土离子(T b3+)具有很强的敏化作用,比较这三个含有惰性稀土离子的配合物,发现L a3+的敏化作用最强。更多还原

【Abstract】 Terbium perchlorate complexes with crown ethers and p-phthalic acid have been synthesized and characterized by elemental analysis,molar conductivity and IR spectra.The results indicate that the complexes have the composition of Tb₂LL′₂（ClO₄）₅·7H₂O,TbLaHLL′₂（ClO₄）₅·4H₂O,TbGdHLL′₂（ClO₄）₅·7H₂O,TbYH₂LL′₂(ClO₄)₆·7H₂O;Tb₂H₂LL″₂（ClO₄）₆·6H₂O,and TbGdHLL″₂（ClO₄）₅·7H₂O （L=p-phthalic acid;L′=18-C-6;L″=15-C-5） respectively.In these rare earth complexes,La³⁺ ion coordinates with the oxygen atoms of crown ethers molecules directly,but Gd³⁺,Tb³⁺ and Y³⁺ ions coordinate to oxygen atom of water molecules which form hydrogen bonds with oxygen atom of crown ethers.p-Phthalic acid links two rare earth complexes with crown ether.Fluorescence spectra are measured,and they show that the fluorescent intensity of terbium complexes are more stronger.The fluorescence emission intensity of Tb³⁺ ion is raised by La³⁺,Gd³⁺and Y³⁺ ions in these compounds.Efficient energy transfer from organic ligands to the terbium ion through the triple states is studied in these rare earth complexes.更多还原