Effect of synthesized temperature on the assembly and properties of four lanthanide supramolecular frameworks

Abstract

Four new lanthanide coordination polymers, [H₃O][Ln₃(HPA)₁₀(H₂O)₃·2H₂O] (Ln = Pr for 1, Ln = Nd for 2), [Ln₂(HPA)₆(H₂O)₄·2H₂O] (Ln = Sm for 3, Ln = Tb for 4) (HHPA =3-(4-hydroxyphenyl)propanoic acid), were successfully synthesized and characterized. 1 and 2 are isostructural and have 1D metal chain structure, while 3 and 4 show 0D network with binuclear subunits. The results indicated that the effect of reaction temperature can modulate the final structures. The HPA ligands adopt bidentate chelating and tridentate chelating bridging modes to coordinate with Ln(III) ions in 1-4. It has been shown that 4 can act as a fluorescent sensor for highly sensitive detection of nitroaromatics and Fe³⁺.

KEY WORDS: Sensor, Lanthanide, Structure, Temperature

Bull. Chem. Soc. Ethiop. 2019, 33(1), 113-125

DOI: https://dx.doi.org/10.4314/bcse.v33i1.11