AUTHOR=Zhu Ting , Yang Xiaoping , Zheng Xiaohui , Wang Shiqing , Bo Le , Wang Chengri , Chen Hongfen , Jiang Dongmei , Schipper Desmond 

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

JOURNAL=Frontiers in Chemistry

VOLUME=6

YEAR=2018

URL=https://www.frontiersin.org/journals/chemistry/articles/10.3389/fchem.2018.00321

DOI=10.3389/fchem.2018.00321

ISSN=2296-2646

ABSTRACT=<p>Two series of Zn-Ln and Cd-Ln nanoclusters [Ln<sub>4</sub>Zn<sub>8</sub>L<sub>2</sub>(OAc)<sub>20</sub>(OH)<sub>4</sub>] [Ln = Nd (<bold>1</bold>), Yb (<bold>2</bold>), and Sm (<bold>3</bold>)] and [Ln<sub>2</sub>Cd<sub>2</sub>L<sub>2</sub>(OAc)<sub>2</sub>(OH)<sub>2</sub>(OCH<sub>3</sub>)<sub>2</sub>] [Ln = Nd (<bold>4</bold>), Yb (<bold>5</bold>), and Sm (<bold>6</bold>)] were prepared using a long-chain Schiff base ligand with a flexible (CH<sub>2</sub>)<sub>2</sub>O(CH<sub>2</sub>)<sub>2</sub>O(CH<sub>2</sub>)<sub>2</sub> chain. All these clusters show square-like structures. The Schiff base ligands show “linear” configurations in the structures of <bold>1</bold>-<bold>6</bold>, 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 <bold>1</bold>-<bold>6</bold> show visible and NIR emissions.</p>