Anion-templated assembly of Co(II)-complexes based on the semirigid carboxylic acid ligand: synthesis, structure and magnetic property

Template-induced synthesis of coordination polymers (CPs) is of increasing interest. Herein, we report the synthesis of two Co(II)-complexes from 4-[(1-carboxynaphthalen-2-yl)oxy]phthalic acid (H 3 L) and 1,10-phenanthroline (phen) templates by two anions ( NO 3 − , CH 3 COO − ) under solvothermal conditions. The compounds were characterized by single-crystal X-ray diffraction, elemental analysis, infrared spectroscopy, powder X-ray diffraction and thermogravimetry measurement, respectively. Compound 1 possesses an infinite 2D layer structure with a ( 6 , 3 )-connected topology. Compound 2 exhibits 2D → 3D supermolecular frameworks by π ⋯ π stacking interactions among adjacent layers. Moreover, magnetization data for 2 with the {Co 2 } units showed the antiferromagnetic coupling in the {Co 2 } units. Graphical abstract Two novel Co(II) coordination polymers have been successfully synthesized by templating two different anions ( NO 3 − , CH 3 COO − ) under solvothermal conditions. Due to the templating role of the anions, the compounds showed different topological structure. Compound 1 possess an infinite 2D layer structure with a (6,3)-connected topology. Compound 2 exhibit 2D → 3D supermolecular frameworks by π ⋯ π stacking interactions among adjacent layers.