AUTHOR=Zhao Ying , Jing Jin , Yan Ning , Han Min-Le , Yang Guo-Ping , Ma Lu-Fang 

TITLE=Different Benzendicarboxylate-Directed Structural Variations and Properties of Four New Porous Cd(II)-Pyridyl-Triazole Coordination Polymers

JOURNAL=Frontiers in Chemistry

VOLUME=8

YEAR=2020

URL=https://www.frontiersin.org/journals/chemistry/articles/10.3389/fchem.2020.616468

DOI=10.3389/fchem.2020.616468

ISSN=2296-2646

ABSTRACT=<p>Four new different porous crystalline Cd(II)-based coordination polymers (CPs), i. e., [Cd(mdpt)<sub>2</sub>]·2H<sub>2</sub>O (<bold>1</bold>), [Cd<sub>2</sub>(mdpt)<sub>2</sub>(<italic>m</italic>-bdc)(H<sub>2</sub>O)<sub>2</sub>] (<bold>2</bold>), [Cd(Hmdpt)(<italic>p</italic>-bdc)]·2H<sub>2</sub>O (<bold>3</bold>), and [Cd<sub>3</sub>(mdpt)<sub>2</sub>(bpdc)<sub>2</sub>]·2.5NMP (<bold>4</bold>), were obtained successfully by the assembly of Cd(II) ions and bitopic 3-(3-methyl-2-pyridyl)-5-(4-pyridyl)-1,2,4-triazole (Hmdpt) in the presence of various benzendicarboxylate ligands, i.e., 1,3/1,4-benzenedicarboxylic acid (<italic>m</italic>-H<sub>2</sub>bdc, <italic>p</italic>-H<sub>2</sub>bdc) and biphenyl-4,4′-bicarboxylate (H<sub>2</sub>bpdc). Herein, complex <bold>1</bold> is a porous 2-fold interpenetrated four-connected 3D <bold><italic>NbO</italic></bold> topological framework based on the mdpt<sup>−</sup> ligand; <bold>2</bold> reveals a two-dimensional (2D) <bold><italic>hcb</italic></bold> network. Interestingly, <bold>3</bold> presents a three-dimensional (3D) rare interpenetrated double-insertion supramolecular net <italic>via</italic> 2D ···ABAB··· layers and can be viewed as an <bold><italic>fsh</italic></bold> topological net, while complex <bold>4</bold> displays a 3D <bold><italic>sqc117</italic></bold> framework. Then, the different gas sorption performances were carried out carefully for complexes <bold>1</bold> and <bold>4</bold>, the results of which showed <bold>4</bold> has preferable sorption than that of <bold>1</bold> and can be the potential CO<sub>2</sub> storage and separation material. Furthermore, the stability and luminescence of four complexes were performed carefully in the solid state.</p>