The structure and magnetic properties of a 3D pillared-layer polymer and two helical chains constructed from flexible ligands

摘要: Abstract Three novel coordination polymers of Co II and Cu with flexible ligands, namely [Co(oba)(dpa)] n ( 1 ), [Cu(oba)(dpa)] 2 ) [Cu(oba)(bpy) 1/2 ] 3 [H oba = 4,4′-oxybis(benzoic acid), dpa = 2,2′-dipyridylamine, bpy = 4,4′-bipyridine] were synthesized by hydrothermal reactions characterized single-crystal X-ray diffraction, thermogravimetric analyses, elemental analysis IR spectroscopy. diffraction reveals that complexes are isostructural. In , the ions linked oba ligands to form 1D helical chain. These chains further assembled into 3D supramolecular edifice via aromatic π–π stacking interactions intermolecular hydrogen bonding. The in complex carboxylate groups an eight-membered ring chains, connectivity between corner-shared bridged bent produce 2D layer containing right-handed chains. Furthermore, adjacent layers connected bpy pillars a framework unprecedented topology (3 15 ·4 20 ·5 8 ·6 ). magnetic properties – have also been investigated.