Acid-directed synthesis of three Cd-based metal–organic frameworks with luminescence and catalytic CO 2 transformation properties

• Published in: CrystEngComm 2022-12, Vol.24 (48), p.8509-8516
• Main Authors: Zhang, Zhen-Wei, Hu, Hui, Wang, Ming-Zhen, Zhang, Qing, Zhou, Wen-Feng, Zhang, Yan-Kai, Yang, Xin-Yi, Liu, Xue-Ying, Zhang, Yong-Zheng, Geng, Longlong, Liu, Zhong-Min, Zhang, Da-Shuai, Zhuang, Shujuan, Wei, Rong-Min, Zhang, Xiuling
• Format: Article
• Language: English
• ISSN: 1466-8033; 1466-8033
• DOI: 10.1039/D2CE01327D

In this paper, we showed an example of acid-directed hydrothermal synthesis of three Cd-based metal–organic frameworks (MOFs) under similar conditions, namely, [Cd(TIDB)(AA) 0.5 (NO 3 )] n (1), [Cd 3 (TIDB) 2 (AA) 2 (H 2 O) 2 (HCOO) 2 ] n (2), and {[Cd 4 (TIDB)(AA) 4 (H 2 O) 5 ](C 2 H 5 OH) 2 (H 2 O) 2 } n (3) (TIDB = 1,3,5-tri(1 H -imidazol-1-yl)benzene, H 2 AA = anthracene-9,10-dicarboxylic acid). Compound 1 was synthesized by the introduction of HNO 3 as a structure-directing agent. It has 2D coordination networks with the 3,4-c bey topology. The porous 3D supramolecular framework in compound 1 is stabilized by H-bonds. Compound 2 was formed with the use of a HCOOH agent. It has a 3D coordination network with a new 3,4,5-c underlying net topology, and it is also porous. Compound 3 was obtained using a CH 3 COOH agent. It has a disordered non-porous 3D coordination network. Because 3 was hard to purify, 1 and 2 were chosen for further property investigation. On the one hand, fluorescence studies showed that 1 and 2 are both blue-emitting MOFs with quantum yields of 2.3% and 0.8%, respectively. On the other hand, CO 2 cycloaddition performance was also tested, which revealed that 2 has a superior catalytic conversion of epoxybutane at 60 °C and 1 atm with a high yield of up to 95.6%.