Self-assembly of coordination polymers of Pr(III), Nd(III), Tb(III), Dy(III) and Ho(III) with 5-hydroxyisophthalic acid and adipic acid: Syntheses, structures, porosity, luminescence and magnetic properties

Abstract Five novel coordination polymers (CPs) with the formula [Ln (hip) (adip) 0.5 (H 2 O) 2 ] n . nH 2 O [Ln = Pr ( 1 ), Nd ( 2 ), Tb ( 3 ), Dy ( 4 ) and Ho ( 5 )] were synthesized by self-organization of lanthanide salts with rigid [5-hydroxyisophthalic acid (H 2 hip)] and flexible [adipic acid (H 2 adip)] linkers under solvothermal condition. X-ray diffraction revealed data that all five CPs 1–5 are isostructural and crystallizes in monoclinic C 2/c space group. Coordination polymers 1–5 exhibit 1D linear ladder shaped extension with the linkage of lanthanide carboxylate chains having the backbone of H 2 hip and H 2 adip ligands. The 1D linear ladder chains get transformed into three dimensional (3D) supramolecular network via non-covalent interactions (π-π and H – bonding). The porosity study showed that 20.34 mL of N 2 gets adsorbed per 1.0 g of sample at 1 atm pressure. The CP 3 (Tb) and 4 (Dy) emit strong ligand sensitized characteristic f-f luminescence emission. The CPs 3 and 4 exhibit weak ferromagnetic interactions at lower temperatures.