Dongmei Jiang

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

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 A, 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.

Self-assembly of luminescent 12-metal Zn–Ln planar nanoclusters with sensing properties towards nitro explosives

Two types of Zn–Ln nanoclusters [Nd2Zn2L2(L′)2(OAc)2(NO3)2(H2O)2] (1) and [Ln6Zn6L2(L′′)2O2(OAc)18] (Ln = Nd (2) and Sm (3)) were prepared using one long Schiff base ligand (H2L) with a naphthyl backbone and two short polydentate ligands (H2L′ and H2L′′). 1 and 2–3 show linear and planar structures with sizes of approximately 10 × 10 × 30 A and 10 × 15 × 22 A, respectively. The chromogenic Zn/ligand components can act as efficient sensitizers for lanthanide luminescence, and thus 1–3 show visible and NIR emissions. In these clusters, the Schiff base ligands display a “U-shaped” configuration, which is suitable to form π⋯π interactions and hydrogen bonds with nitro aromatic compounds. Interestingly, Zn–Sm cluster 3 shows visible and NIR luminescence sensing of nitro explosives and exhibits high sensitivity to 1,4-DNB and TNT at the ppb level.

CCDC 1842950: Experimental Crystal Structure Determination

Related Article: Dongmei Jiang, Xiaoping Yang, Xiaohui Zheng, Le Bo, Ting Zhu, Hongfen Chen, Lijie Zhang, Shaoming Huang|2018|J.Mater.Chem.C|||doi:10.1039/C8TC02426J

CCDC 1842949: Experimental Crystal Structure Determination

Related Article: Dongmei Jiang, Xiaoping Yang, Xiaohui Zheng, Le Bo, Ting Zhu, Hongfen Chen, Lijie Zhang, Shaoming Huang|2018|J.Mater.Chem.C|6|8513|doi:10.1039/C8TC02426J

CCDC 1842951: Experimental Crystal Structure Determination

Related Article: Dongmei Jiang, Xiaoping Yang, Xiaohui Zheng, Le Bo, Ting Zhu, Hongfen Chen, Lijie Zhang, Shaoming Huang|2018|J.Mater.Chem.C|6|8513|doi:10.1039/C8TC02426J

Luminescent Polynuclear Zn- and Cd-Ln Square-Like Nanoclusters With a Flexible Long-Chain Schiff Base Ligand

Two series of Zn-Ln and Cd-Ln nanoclusters [Ln4Zn8L2(OAc)20(OH)4] [Ln = Nd (1), Yb (2), and Sm (3)] and [Ln2Cd2L2(OAc)2(OH)2(OCH3)2] [Ln = Nd (4), Yb (5), and Sm (6)] were prepared using a long-chain Schiff base ligand with a flexible (CH2)2O(CH2)2O(CH2)2 chain. All these clusters show square-like structures. The Schiff base ligands show “linear” configurations in the structures of 1-6, and the metric dimensions of Zn-Ln and Cd-Ln clusters measure ~8 × 14 × 21 and 8 × 12 × 12 Å, respectively. The study of luminescence properties shows that the Zn/L and Cd/L chromophores can effectively transfer energy to the lanthanide ions, and 1-6 show visible and NIR emissions.