Synthesis and characterization of cerium(III), praseodymium(III), gadolinium(III) and erbium(III) coordination polymers with zwitterionic ligand

Four new 2D coordination polymers based on 4-carboxy-1-(4-carboxybenzyl)pyridinium bromide (H(2)cbpyBr), formulated as {[Ce(mu-cbpy)(mu(4)-cbpy)(H2O)(2)]Br center dot 7H(2)O center dot CH3CN} n (1), {[Pr(mu-cbpy)(mu(4)-cbpy)(H-2 O)(2)]Br center dot 2H(2)O center dot CH3CN}(n) (2), {[Gd(mu-cbpy)(mu-cbpy)(mu-CHOO)]center dot 4H(2)O center dot C2H5OH}(n) (3) and {[Er(mu-cbpy)(mu-cbpy)(mu-CHOO)]center dot 2H(2)O center dot C 2H5OH}(n) (4) were synthesized under solvothermal conditions and their characterizations were carried out with single crystal X-ray diffraction, IR spectroscopy, elemental and thermal analyses. Single-crystal X-ray diffraction analyses revealed that compounds 1-4 displayed 2D structures with 44.62 point symbol and sql topology. The adjacent 2D layers were extended to 3D supramolecular framework through the O-H center dot center dot center dot pi and pi center dot center dot center dot pi interactions between pyridine and phenyl rings. The cbpy ligand in compounds 1-4 adopted four different coordination modes. (C) 2021 Elsevier B.V. All rights reserved.

Automated summary

Four new 2D coordination polymers based on H(2)cbpyBr, labeled as (1), (2), (3) and (4), were synthesized and characterized using various techniques, revealing different coordination modes and 3D supramolecular frameworks among them.