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选择具有(N^N)(N^N)位点的四齿配体2,2’-联嘧啶(bpm)作为桥联配体,利用铱配合物Ir(dfppy)2(bpm)Cl作为配体与稀土配合物Ln(TTA)3·2H2O配位,得到了IrIII-LnIII(Ln=Nd,Yb,Er)双金属配合物[Ir(dfppy)2(bpm)Ln(TTA)3]Cl.通过荧光滴定的方法,测定了该铱配合物与稀土离子之间的络合稳定常数.通过对铱配合物及IrIII-LnIII(Ln=Nd,Yb,Er)双金属配合物在可见区光谱的测定,可以观察到明显的铱配合物发光的猝灭,说明从铱中心到稀土中心发生了能量传递.同时,利用可见光选择性激发铱配合物可以获得在稀土NdIII,YbIII,ErIII离子红外区的发光.说明了铱配合物Ir(dfppy)2(bpm)Cl作为配体可以较好地敏化稀土离子的红外发光.
The tetradentate ligand 2,2’-bipyrimidine (bpm) with (N ^ N) (N ^ N) sites was selected as the bridging ligand and the iridium complex Ir (dfppy) 2 (Ir (dfppy) 2 (bpm) Ln (TTA) 3] Cl was obtained by the coordination of the rare earth complex Ln (TTA) 3 · 2H2O with IrIII-LnIII (Ln = Nd, Yb, Er) The complexation constants of iridium complexes and rare earth ions were determined by fluorescence titration.The Iridium complex and IrIII-LnIII (Ln = Nd, Yb, Er) bimetallic complexes were measured in the visible region , We can observe the obvious quenching of luminescence of iridium complex, which shows that the energy transfer occurs from the center of iridium to the center of rare earth.At the same time, the selective excitation of iridium complex with visible light can obtain the emission spectra of rare earth Nd, YbIII, ErIII It is demonstrated that the iridium complex Ir (dfppy) 2 (bpm) Cl can sensitize the infrared luminescence of rare earth ions.