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

• Published in: Journal of solid state chemistry 2017-11, Vol.255, p.61-69
• Main Authors: Kariem, Mukaddus, Yawer, Mohd, Kumar, Manesh, Nawaz Sheikh, Haq, Sood, Puneet, Kolekar, Sanjay S.
• Format: Article
• Language: English
• Subjects: Lanthanide coordination polymers; Magnetic properties; Photoluminescence properties; Porous material; Supramolecular framework
• ISSN: 0022-4596; 1095-726X
• DOI: 10.1016/j.jssc.2017.08.001

Five novel coordination polymers (CPs) with the formula [Ln (hip) (adip)0.5(H2O)2]n. nH2O [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 (H2hip)] and flexible [adipic acid (H2adip)] linkers under solvothermal condition. X-ray diffraction revealed data that all five CPs 1–5 are isostructural and crystallizes in monoclinic C2/c space group. Coordination polymers 1–5 exhibit 1D linear ladder shaped extension with the linkage of lanthanide carboxylate chains having the backbone of H2hip and H2adip 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 20.34mL of N2 gets adsorbed per 1.0g of sample at 1atm 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. Reactions of rigid 5-Hydroxyisophthalic acid and flexible tethering linker Adipic acid with Ln(NO3)3·xH2O (Ln = Pr, Nd, Tb, Dy&Ho) results in formation of 3D supramolecular coordination polymers under solvo/hydrothermal condition in presence of diethylformamide (DEF) as a solvent. [Display omitted] •Mixed solvent induced synthesis of five coordination polymers with 1D structure.•Strong and directional non-covalent interactions lead to 3D supramolecular network.•P-XRD was recorded to check the phase purity if sample.•Luminescent and magnetic properties of CP 3&4 were explored.