Sensitised near-infrared emission from lanthanides using an iridium complex as a ligand in heteronuclear Ir2Ln arrays
作者:Fang-Fang Chen、Zu-Qiang Bian、Bin Lou、En Ma、Zhi-Wei Liu、Dao-Bo Nie、Zhu-Qi Chen、Jiang Bian、Zhong-Ning Chen、Chun-Hui Huang
DOI:10.1039/b810016k
日期:——
The iridium(III) complex Ir(ppy)2(phen5f) [ppy = 2-phenylpyridinato-N,C2′, and phen5f = 4,4,5,5,5-pentafluoro-1-(1′,10′-phenanthrolin-2′-yl)-pentane-1,3-dionate] has been synthesised and used as “complex ligands” to make heteronuclear d–f complexes by the attachment of Ln(NO3)3·xH2O at the vacant coordination sites in the bridging ligand phen5f. The microanalyses and crystal structure characteristics confirmed the formation of the heteronuclear Ir2Ln arrays. The measurement of the lowest triplet state energy level of Ir(ppy)2(phen5f) indicates that it is suitable for the NIR (near-infrared) lanthanide ions, NdIII, YbIIIand ErIII. Upon irradiation of the MLCT (metal-to-ligand charge transfer) absorption of Ir(ppy)2(phen5f) at an excitation wavelength from 380–490 nm, the characteristic emission spectra of the three Ir2Ln arrays (Ln = Nd, Yb, Er) in both the solid state and in CH3CN solution were measured. According to the results, more IrIII complexes will be designed for lanthanide NIR emission by the proper combination between the cyclometalated ligand and the tetradentate ancillary ligand.
合成了铱(III)配合物Ir(ppy)2(phen5f) [ppy = 2-苯基吡啶-N,C2',phen5f = 4,4,5,5,5-五氟-1-(1′,10′-菲啰啉-2′-基)-戊二酸-1,3-二酯],并作为“配体复合物”以在桥联配体phen5f的空位配位位点上附加Ln(NO3)3·xH2O,从而制造异核d–f配合物。微量分析和晶体结构特征确认了异核Ir2Ln阵列的形成。测量Ir(ppy)2(phen5f)的最低三重态能级表明其适用于近红外(NIR)的镧系离子NdIII、YbIII和ErIII。在380–490 nm的激发波长下,照射Ir(ppy)2(phen5f)的金属-配体电荷转移(MLCT)吸收,测量了三种Ir2Ln阵列(Ln = Nd, Yb, Er)在固态和CH3CN溶液中的特征发射光谱。根据结果,通过合适结合环金属配体和四齿辅助配体,更多的IrIII配合物将被设计用于镧系NIR发射。