Cu(II) coordination polymers with 4,4′-bipyridine. Synthesis and crystal structures

Extensively research has been devoted to the isolation and characterization of Cu(II) coordination polymers. Since many aspects can influence the final crystal structure, the effect of the solvent molecules through intermolecular interactions has been proven to be a determining factor. Herein, we elucidated the structure of two Cu(II) concomitant 1D polymers containing piperonylic acid (HPip) and 4,4'-bipyridine (4,4'-bipy), which were simultaneously crystallized and subsequently isolated changing the synthetic conditions. Complex {[Cu(Pip)(2) (4,4'-bipy)]}(n) (1) exhibits zig zag polymeric chains while ([Cu(Pip)(2) (4,4'-bipy)(H2O)]center dot 1/2(4,4'-bjPY)center dot(DMF)}(n), (2) displays linear polymeric chains stacked by water center dot center dot center dot carboxylate intermolecular interactions, forming voids occupied by alternated guest 4,4'-bipy and DMF molecules. (C) 2021 Elsevier B.V. All rights reserved.

Automated summary

Extensive research has been conducted on the isolation and characterization of Cu(II) coordination polymers, with the role of solvent molecules through intermolecular interactions being a determining factor in the final crystal structure. The study revealed the structures of two Cu(II) concomitant 1D polymers containing piperonylic acid and 4,4'-bipyridine, showcasing different polymeric chain arrangements influenced by the solvent molecules.