Synthesis of Two New Macrocycles Capable to Act as Linkers for Coordination Polymers

The design of coordination polymers (CPs) is essentially reliant on the type, number, and the position of the donor groups alongside the length and flexibility of the linker1. Thanks to their pre-organized entities together with central role in ligand field, employing organic linkers containing aza-crown macrocycles encourage the scientific community to synthesize new interesting coordination networks2.Recently, we reported new organic likers based on macrocyclic backbones bearing pyridine side arms as coordinating sites, whereas their ability to generate coordination CPs in the presence of metal ion nodes was also investigated3. Our subsequent observations4,5 also indicated on various novel applications for these CPs. Here we report the synthesis of two new linkers 1 and 2 (Scheme 1) based on macrocyclic backbones bearing carboxylic coordinating sites, capable to act as new likers for upcoming CPs.