Three new copper(II) coordination polymers constructed from isomeric sulfo-functionalized phthalate tectonics: Synthesis, crystal structure, photocatalytic and proton conduction properties

Three new copper(II)-based coordination polymers, namely [Cu-5(mu(3)-OH)(4) (STP)(2)(4,4'-bipy)(2)(H2O)(2)]center dot 4H(2)O (CTGU-20), [Cu-2(mu(2)-OH)(SIP)(1,4'-bib)(2)] (CTGU-21) and [Cu-2(SIP)(4,4-bibp)(2)(HCOO)]center dot 3H(2)O(CTGU-22), (STP = 2-sulfoterephthalate, SIP = 5-sulfoisophthalate, 4,4'-bipy = 4,4'-bipyridine, 4,4'-bibp = 4,4'-bis(imidazolyl) biphenyl and 1,4-bib = 1,4-bis(1-imidazoly) benzene) have been prepared by two less-developed isomeric sulfo-functionalized phthalate ligands under solvothermal conditions and characterized by PXRD, single crystal X-ray diffraction analysis and thermogravimetric analysis.CTGU-20 exhibits a 3D pillared-layer framework constructed from a unique 1D Cu4O8-CuO4 rod packing unit generated by four mu(3)-OH groups and pyridyl/carboxylicate mixed linkers. While, CTGU-21 shows a 3D pillared-layer framework extended by Cu-2(mu(2)-OH)(SIP) layers and 1,4-bib pillars. When 1,4-bib was replaced by longer 4,4'-bibp, CTGU-22 is obtained, which features a 2D bilayer structure bridged by double 4,4'-bibp ligand. Remarkably, complexes CTGU-20, CTGU-21 and CTGU-22 show promising photocatalytic activities toward the degradation of Rhodamine B(RhB), methyl blue(MB) and 9,10-bis (phenylethynyl)anthracene(BPEA). Moreover, the proton conductivity for three complexes were also studied.

Automated summary

Three new copper(II)-based coordination polymers were synthesized using less-developed isomeric sulfo-functionalized phthalate ligands, exhibiting distinct crystal structures. These complexes showed promising photocatalytic activities for dye degradation and were also studied for their proton conductivity.