2-噻吩乙醛酸-三苯基氧化膦-铕配合物的合成、结构表征及荧光性能的研究  

Synthesis, Characterization of Structure and Fluorescence Properties of Solid Complex of Europium Ion with TPPO and 2-Thiopheneglyoxylic Acid

作　　者：于斌[1] 孙波[1] 赵莹[2] 阎晓琦[1] 王云友 颜剑波 

机构地区：[1]南开大学化学学院材料化学系,天津300071 [2]中国科学院化学所高分子物理与化学国家重点实验室,北京100080 [3]中国东港工贸集团公司,浙江台州318000

出　　处：《中国稀土学报》2004年第6期887-890,共4页Journal of the Chinese Society of Rare Earths

摘　　要：用硝酸铕、2 噻吩乙醛酸(HL)和三苯基氧化膦(TPPO)合成了一种新型固体发光配合物;用元素分析、电导率、红外光谱和核磁共振确定了该配合物的分子式为EuL3TPPO((H2O)2;在室温下测定了该配合物的荧光激发光谱和发射光谱;配合物中Eu(Ⅲ)离子的3个主要跃迁5D0→7F1,5D0→7F2和5D0→7F4分别位于593.4,618.8和699.4nm。该固体配合物于室温下被紫外灯照射可以发出很强的红色荧光。IR光谱中2 噻吩乙醛酸在与稀土铕离子形成配合物后,νas(-COO-)由钠盐的1632cm-1移至1612cm-1,νs(-COO-)由1389cm-1移至1409cm-1;νc=o(α 酮基)由HL的1654cm-1移至1662cm-1。配合物的νEu-O吸收峰出现在541cm-1。在1HNMR谱图中,噻吩环上的3个氢原子的化学位移在形成配合物后移向高场;三苯基氧化膦中苯环上5种不同环境的质子的化学位移在形成配合物后向低场移动。TG分析证明,该固态配合物于空气中在常温至190℃以内是稳定的。The europium complex with triphenyl phosphine oxide (TPPO) and 2-thiopheneglyoxylic acid (HL) was synthesized. Its chemical formula was determined to be [EuL_3TPPO·(H_2O)_2] by elemental analysis, electrical conductivity, IR and (()~1HNMR.) It is found that the europium ion is coordinated to the oxygen atoms of 2-thiopheneglyoxylate, TPPO and H_2O. The excitation and emission spectra were recorded at room temperature, and the three main emission peaks at 593.4, 618.8 and 699.4 nm are assigned to the (()~5D_0→()~7F_1,) (()~5D_0→()~7F_2) and (()~5D_0→()~7F_4) tromsitions, respectively. It is also observed that the title complex emits strong red fluorescence under ultraviolet light at room temperature. In the IR spectrum, the ν_(as) (-COO^- ) and ν_s (-COO^-) of NaL which appears at 1632 and 1389 cm^(-1) while those of the complex shift to 1612 and 1409 cm^(-1), respectively. ν_(Eu-O) appears at 541 cm^(-1). In (()~1HNMR,) the signals of 2-thiopheneglyoxylic acid are shift upfield, and those of TPPO downfield. It is proved by the TG analysis that the complex is stable from ambient temperature to 190 ℃ in the air.

关 键 词：铕配合物 2-噻吩乙醛酸 三苯基氧化膦 荧光光谱 红外光谱 稀土 

分 类 号：O614.338[理学—无机化学]