Laboratory of Functional Materials, Institute of Chemistry, University of Campinas, Unicamp, Campinas, SP, Brazil.
J Fluoresc. 2013 Sep;23(5):939-46. doi: 10.1007/s10895-013-1219-5. Epub 2013 May 2.
This work reports on the photoluminescent properties of three new lanthanide complexes with acetoacetanilide (aaa), a β-diketonate ligand. The complexes have the general molecular formulae [RE(aaa)3(H2O)], they are soluble in organic solvents such as ethanol and chloroform and insoluble in water. The energy of the triplet state was determined at about 4,700 cm(-1) higher than the (5)D4 emitting level of the Tb(III) ion, leading to an absolute quantum yield of 22% for the [Tb(aaa)3(H2O)] complex. The photoluminescent properties were studied and the luminescence parameters of the [Eu(aaa)3(H2O)] complex were experimentally determined. The photostabilities of the complexes under continuous UV irradiation were measured and the data indicate low stability of the [Tb(aaa)3(H2O)] complex when the system is excited at the band attributed to energy transfer from the ligand to terbium(III) ion. However, its photostability is significantly improved under inert atmosphere.
这项工作报道了三种新型镧系配合物的光致发光性质，这些配合物具有乙酰丙酮（aaa）作为β-二酮配体的通式[RE(aaa)3(H2O)]。它们可溶于乙醇和氯仿等有机溶剂，不溶于水。三重态的能量约为 4700cm-1 高于 Tb(III)离子的（5）D4 发射能级，导致[Tb(aaa)3(H2O)]配合物的绝对量子产率为 22%。研究了光致发光性质，并实验确定了[Eu(aaa)3(H2O)]配合物的发光参数。测量了配合物在连续紫外光照射下的光稳定性，数据表明，当体系被激发到配体向铽(III)离子能量转移的波段时，[Tb(aaa)3(H2O)]配合物的稳定性较低。然而，在惰性气氛下，其光稳定性得到显著提高。
