A new praseodymium-based coordination polymers with 1,10-phenantroline and glutarate ligands: Synthesis, crystal structure and luminescent properties.

Abstract A praseodymium-based coordination polymer with chemical formula [Pr(Hglu)(glu)phen·2H2O]∞ (phen = 1,10-phenanthroline, glu = glutarate) has been hydrothermally synthesized as single crystal, structurally characterized by X-ray diffraction, IR spectroscopy and ATG measurements. This compound crystallizes in the triclinic system, space group P 1 ¯ , with the following cell parameters: a = 9.8254(9) A, b = 11.0617(9) A, c = 12.8552(12) A, α = 97.588(3)°, β = 108.427(3)°, γ = 112.643(3)°, V = 1170.87(19) A3 and Z = 2. The praseodymium cation is nine-fold coordinated by one chelating phenanthroline ligand, two mono-protonated glutarate ligands, and three fully de-protonated glutarate ligands. The crystal structure is 1D and can be described on the basis of double molecular chains that bridge di-nuclear units. Inside a di-nuclear unit, Pr(III)-Pr(III) distance is 4.0475(3) A. Room temperature solid-state emission spectrum has been recorded under 295 nm excitation wavelength. It shows the characteristic peaks of Pr3+ ion between 480 and 750 nm.