Coordination-Driven Heterochiral Self-Assembly: Construction of Cd(II) Coordination Polymers with Sorption Behaviors for Iodine and Dyes
Yue-Qun Lin, Xiao‐Mao Tian, Ying Xiong, Chao Huang, Dong-Mei Chen, Bi‐Xue Zhu
Abstract
A racemic bispyridyl ligand ( L ) was synthesized via a Schiff base condensation reaction. Four Cd(II) complexes, {[Cd L 2 Cl 2 ]·2DMF} n ( 1 ), [Cd L I 2 ] n ( 2 ), {[Cd L 2 Br 2 ]·4H 2 O} n ( 3 ), and {[Cd L 2 (H 2 O) 2 ](NO 3 ) 2 ·2CH 3 OH·8H 2 O} n ( 4 ), were synthesized and further characterized based on this ligand. Single-crystal structures show that the coordination-driven assembly of the bispyridyl ligand with Cd(II) salts bearing different counteranions can lead to multidimensional coordination polymers via a heterochiral self-discrimination process. Complex 1 exists as a one-dimensional (1D) looped chain polymer, and complex 2 exists as a 1D zigzag chain polymer. Complex 3 is a 2D grid coordination polymer, and complex 4 exists as a 3D framework polymer. Furthermore, the iodine sorption capacities of the four complexes were investigated in the solution of n -hexane and water as well as in the iodine steam. The dye sorption behaviors were investigated in water, which showed that complex 2 exhibited good adsorption for crystal violet ( CV ), while complex 4 had good adsorption capability toward direct yellow 4 ( DY ).