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Issue 4, 2018
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Anion dependent self-assembly of drum-like 30- and 32-metal Cd–Ln nanoclusters: visible and NIR luminescent sensing of metal cations

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Abstract

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 the 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.

Graphical abstract: Anion dependent self-assembly of drum-like 30- and 32-metal Cd–Ln nanoclusters: visible and NIR luminescent sensing of metal cations

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Publication details

The article was received on 07 Sep 2017, accepted on 18 Dec 2017 and first published on 19 Dec 2017


Article type: Paper
DOI: 10.1039/C7TC04101B
Citation: J. Mater. Chem. C, 2018,6, 865-874
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    Anion dependent self-assembly of drum-like 30- and 32-metal Cd–Ln nanoclusters: visible and NIR luminescent sensing of metal cations

    C. Wang, X. Yang, S. Wang, T. Zhu, L. Bo, L. Zhang, H. Chen, D. Jiang, X. Dong and S. Huang, J. Mater. Chem. C, 2018, 6, 865
    DOI: 10.1039/C7TC04101B

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