Abstract
Three binuclear lanthanide complexes [Nd2(L1)3(MeOH)]·MeOH·H2O (1) and [Ln2(H2L2)2(OAc)4]·2(CF3SO3)·MeOH·EtOH (Ln=Nd (2) and Ho (3)) were prepared using two Schiff base ligands. Interestingly, 1 has a triple-decker structure with two lanthanide ions enclosed by three rigid conjugated Schiff base ligands (H2L1), while 2 and 3 show nanoscale ring structures (8×12×12Å) formed by flexible long-chain Schiff base ligands (H2L2, ~23Å) with the lanthanide ions located in the center. Upon excitation of the ligand-centered absorption bands, 1–2 and 3 show typical NIR emission spectra for Nd3+ and Ho3+ ions, respectively. In 1, the Nd(III) centers are shielded within the decker-like structure and surrounded by chromogenic Schiff base ligands (energy transfer donors). Luminescence studies show that the NIR emission lifetime of 1 is longer than that of 2 in solution.
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