Synthesis and Alcohol Vapor Adsorption Properties of Two 1D Coordination Polymers Based on a Racemic Ligand

A Schiff‐base ligand ( L ) was synthesized from the reaction of achiral precursors N ² , N ⁶ ‐bis(2‐aminophenpy)pyridine‐2,6‐dicarboximide and 4‐(1 H ‐imidazol‐1‐yl)benzaldehyde. Two coordination polymers (CPs), {[Cd L ^P L ^M I ₂ ]·2DMF} _n (CP 1 ) and {[Zn L ^P L ^M (H ₂ O) ₂ ]·2I·2DMF} _n (CP 2 ) were synthesized from the reaction of L with CdI ₂ or ZnI ₂ under the same condition. The single‐crystal X‐ray diffraction analysis revealed that L exhibits as a racemic ligand with equal amounts of P ‐ and M ‐helicity configurations. Both CPs 1 and 2 exist as 1D looped‐chain polymers. In CP 1 , the Cd(II) ions are six‐coordinated by four imidazole nitrogen atoms and two I ^– anions, while the Zn(II) ions in CP 2 are six‐coordinated by four imidazole nitrogen atoms and two water molecules, indicating their structural differences in coordination assembly. Moreover, the gas and vapor adsorption measurements displayed that both CPs exhibit good adsorption capacities toward methanol and ethanol vapor.