标题：Anion Dependent Self-assembly of drum-like 30- and 32-metal CdLn Nanoclusters: Visible and NIR Luminescent Sensing of Metal Cations
Abstact：Two types of drum-like 30- and 32-metal Cd-Ln nanoclusters [Ln8Cd24L12(OAc)48] (Ln = Sm (1), Yb (2), Er (3)) and [Er8Cd22L12(OAc)38(OH)6] (4) were constructed using a designed Schiff base ligand built around a flexible (CH2)7 chain. Hydroxide (OH-) anions are found in the structure of 4, indicating that the basic environment favors the formation of 30- metal cluster. The chromogenic Cd/L components in these clusters can act as efficient sensitizers for lanthanide luminescence. With the Ln(III) centers enclosed within the drum-like structures, 1-4 display the typical emission spectra of lanthanide ions. For the Cd-Er clusters, 3 exhibits better NIR luminescence properties than 4. The long-chain Schiff base ligands show “linear” configurations in these clusters, resulting in the large sizes of 1-4. The drum-like structures of 1-4 have inner cavities with the internal sizes approximately 6 × 11 × 11 Å, and some solvent molecules such as H2O, MeOH and EtOH are enclosed in the drums. Interestingly, the Cd-Sm cluster 1 shows visible and NIR luminescent sensing of metal cations and exhibits high selectivity to Zn2+ and Fe3+ ions
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