Abstract
Three multinuclear Cd–Ln complexes [Er2Cd2L2(OAc)2(OH)2(OCH3)2] (1) and [Ln2CdL2(NO3)4] (Ln = Er (2) and Sm (3)) were prepared using a flexible long-chain Schiff base ligand. Interestingly, 1–3 show nano-rectangular-like structures (i.e. 8 × 12 × 12 Å for 1 and 7 × 10 × 15 Å for 2 and 3). 1 has a tetranuclear structure with two lanthanide ions and two Cd2+ enclosed by two flexible Schiff base ligands (H2L), while 2 and 3 show trinuclear structures with the Cd(II) ion located in the center. Upon excitation of the ligand-centered absorption bands, 1–2 and 3 show typical emission spectra for Er3+ and Sm3+ ions, respectively. Luminescence studies exhibit that 1 shows higher emission quantum yield than 2.
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