Assembly of Co(II)/Cd(II) Coordination Polymers through a Mixed-Ligand Strategy: Structure, CO <sub>2</sub> Chemical Fixation, and Oxidation of Sulfides
Tian‐Cai Yue, Tao Zeng, Ablimit Abdukader, Xinfang Wang, Lulu Wang, Duo‐Zhi Wang
Abstract
High Resolution Image Download MS PowerPoint Slide Four Co(II) coordination polymers (CPs) ({[Co 4 ( L ) 4 (2,6-PYDC) 4 (H 2 O) 4 ]·H 2 O } n (1), {[Co 2 ( L ) 2 (1,4-BDC)(1,4-HBDC)Cl]·2H 2 O} n (2), [Co( L )(ntpa)H 2 O] n (3), [Co( L )(1,3,5-HTBC)] n (4) ), two Cd(II) CPs ([Cd( L )(1,2,4-HTBC)] n (5), and [Cd( L )(1,4-NDC)] n (6) ) ( L = 4’-(4-(1 H -1,2,4-triazol-1-yl)phenyl)-4,2’:6“,4”’-terpyridine; 2,6-H 2 PYDC: pyridine-2,6-dicarboxylic acid; 1,4-H 2 BDC: terephthalic acid; H 2 ntpa: 2-nitroterephthalic acid; 1,3,5-H 3 TBC: trimesic acid; 1,2,4-TBC: 1,2,4-benzenetricarboxylic acid; 1,4-H 2 NDC: 1,4-naphthalenedicarboxylic acid) were hydrothermally constructed by a mixed ligand strategy, showing one one-dimensional (1D) ( 1 ), two two-dimensional (2D) ( 2 and 4 ), and three three-dimensional (3D) ( 3, 5, and 6 ) structures. The crystal structures and catalytic activities of CPs 1 – 6 were studied in detail. Catalytic performance research indicated that CP 3 could efficiently catalyze the cyclization reaction of epoxides with CO 2 in efficient yields. Moreover, the metal center of CP 5 interacts with the oxidant to generate active peroxo species, achieving efficient selective oxidation of sulfides. Importantly, CP 3 and CP 5 exhibited excellent reusability and retained structural stability and high catalytic activity after five cycles. Therefore, CP 3 and CP 5 have potential as efficient and stable heterogeneous catalysts.