铕与苯乙酮酸、1,10-罗啉及三苯基氧膦配合物的合成、结构表征及荧光性能的研究

以硝酸铕、苯乙酮酸（HE）、1，10-罗啉（phen）和三苯基氧膦（TPPO）合成了Eu—L，EuL3phen和EuL2（TPPO）2NO3三种新型固态配合物。用元素分析、电导率、红外光谱、核磁共振谱对配合物进行了表征，确定了三元配合物的组成。IR表明，苯乙酮酸与Eu^3＋离子形成配合物后△v（vas（CO2^-）-vs（CO2））（△v（Eu—L）=391cm^-1；△v（EuL3phen）=389cm^-1；△v（EuL2（TPPO）2NO3）=402cm^-1）值均大于钠盐的△v（379cm^-1）值，配合物中羧酸根以单齿方式配位；配合物中苯乙酮酸的α-酮基参与配位，其红外吸收峰移向低波数。在^1H NMR中，苯乙酮酸苯环上5个氢原子的化学位移在形成配合物后移向高场。室温下测定了配合物的荧光激发光谱和发射光谱。激发光谱表明配合物Eu—L，EuL3phen和EuL2（TPPO）2NO3最佳激发波长分别为374．0，358．2和383．4nm。发射光谱显示Eu^3＋离子的特征发射光谱。分别是^5D0-^7F0，^5D0-^7F1，^5D0-^7F2，^5D0-^7F3，^5D0-^7F4跃迁（Eu—L：577．8，590．2，614．0，648．4，695．4nm；EuL3phen：578．0，588．4，591．6，611．2，617．0，649．4，687．6，698．6nm；EuL2（TPPO）2NO3：577．8，590．4，614．6，649．2，697．6nm）。荧光光谱表明TPPO对Eu^3＋离子的荧光发射有明显增强作用。

Synthesis, Structure Characterization and, Fluorescence Studies of the Complexes of Europium with Phenylglyoxylic Acid, 1,10-Phenanthroline and Triphenyl Phosphine Oxide

Three novel europium complexes, Eu-L, EuL3phen and EuL2 (TPPO)2NO3, were synthesized (HL = phenylglyoxylic, phen= 1,10-phenanthroline, and TPPO = triphenyl phosphine oxide). The complexes were characterized by elemental analysis, conductivity, IR, and 1H NMR. The IR spectra indicated that all the complexes have a larger deltaupsilon(upsilon(as) (CO2-) - upsilon(s)(CO2-) than that of NaL, and carboxylate ions in the phenylglyoxyate coordinated as unidentate ligands. And alpha-aeto also coordinated with the europium ions. In 1H NMR, the signals of hydrogens in the phenylglyoxyate shifted toward upfield, and those in phen or TPPO slightly shifted. The excitation and emission spectra were recorded at room temperature, and the excitation spectra showed that the optimum excitation wavelengths were 374.0, 358.2 and 383.4 nm, Five emission bands of the complexes due to 5D(0)-7F(0), 5D(0)-7F(1), 5D(0)-7F(2), 5D(0)-7F(3) and 5D(0)-7F(4) transitions were observed in the region of 550-720 nm (Eu-L: 577.8, 590.2, 614.0, 648.4 and 695.4 nm; EuL3phen: 578.0, 588.4, 591.6, 611.2, 617.0, 649.4, 687.6 and 698.6 nm; EuL2 (TPPO)2NO3: 577.8, 590.4, 614.6, 649.2 and 697.6 nm). The emission intensities of europium ions were obviously sensitized by TPPO.