Solvothermal synthesis of two novel Co(II)-based coordination polymers for the efficient UV-light-driven degradation of methyl violet and magnetic properties

Two novel Co(II) coordination polymers (CPs), formulated as {[Co2(L)(H2O)6].H2O}n (1) and {[Co (bidpe)2(H2O)2].H2L.3.5H2O}n (2) (H4L = 3,5-bis(3,4-dicarboxylphenoxy)pyridine, bidpe = 4,4 '-bis(lmidazolyl) diphenyl ether), have been solvothermally synthesized and characterized by various techniques. Complex 1 exhibited a 2D -> 3D supramolecular framework through H-bonds with a point symbol of (12)(4.125)(4) topology. However, with the introduction of additional bibpe ligand, the H4L ligand did not coordinate with Co(II) ions in the synthesis of 2. Complex 2 possessed a 1D [Co(bidpe)2]n loop line, which was further linked by H-bonds to form a 3D supramolecular architecture. In particular, both the CPs exhibited efficient photocatalytic activities towards the degradation of methyl violet (MV) under low-energy irradiation of a 125 W Hg lamp, which could be attributed to their high efficiencies in generating .OH radicals. Moreover, the variable-temperature magnetic analyses indicated that 1 and 2 exhibit antiferromagnetic behavior between the adjacent Co(II) ions.

Automated summary

Two novel Co(II) coordination polymers were synthesized and characterized. Complex 1 exhibited a 2D -> 3D supramolecular framework, while complex 2 possessed a 1D [Co(bidpe)2]n loop line and further formed a 3D supramolecular architecture. Both CPs showed efficient photocatalytic activities towards the degradation of methyl violet under low-energy irradiation, which could be attributed to their high efficiencies in generating .OH radicals. Additionally, 1 and 2 exhibited antiferromagnetic behavior between adjacent Co(II) ions according to variable-temperature magnetic analyses.