Multi-dimensional copper(I) and silver (I) coordination polymers assembled with a pyridyl bis-urea macrocyclic ligand

We report the synthesis of a new flexible multimodal macrocyclic ligand, protected pyridyl bis-urea macrocycle 1, and two of its coordination polymers Cu2I2(1)(2)center dot(CH3CN)(1.63) (2) and [Ag(1)](NO3). (H2O)(2.49) (3). The ligand possesses conformational flexibility and adopts different conformations and binding modes depending on the metal ions. The crystal structure of 2 shows a 2D coordination network constructed from rhomboidal Cu2I2 dimer units and 1 as a bridging ligand binding through the pyridyl N atoms. 3 forms a sophisticated 3D structure with 1D chains formed by N-Ag-N links between pyridyl N atoms of two adjacent macrocyclic ligands and Ag(I) ions. These chains form 2D layers through longer Ag-O interactions and the chains are linked together into a 3D network by hydrogen bonding involving interstitial water molecules. These results indicate the potential of ligand 1 in the self-assembly of coordination polymers with diverse topology and functional applications. (C) 2021 Elsevier Ltd. All rights reserved.

Automated summary

A new flexible multimodal macrocyclic ligand was synthesized and used to form two coordination polymers with different structures. The ligand exhibited conformational flexibility and could adopt different conformations and binding modes depending on the metal ions. The coordination polymers demonstrated potential for diverse topology and functional applications in self-assembly.