A New 2D Layered Barium Coordination Polymer [Ba（3-NPA）]n： Synthesis,Crystal Structure,Thermal Stability and Luminescent Properties

A new two-dimensional(2D) barium(Ⅱ) coordination polymer Ba(3-NPA)]n(1) has been obtained by the hydro/solvothermal reaction of the corresponding metal salt with 3-nitrophthalic acid(3-NPAH2). Compound 1 was characterized by infrared spectrum, elemental analysis, powder X-ray diffraction(PXRD) and single-crystal X-ray diffraction analysis. Compound 1 crystallizes in triclinic, space group P1 with a = 4.9611(3), b = 7.2599(4), c = 12.9463(8) , α = 89.0892(2), β = 80.546(2), γ = 73.211(2)°, V = 440.1(5) 3, Z = 2, C8H3BaNO6, Mr = 346.45, Dc = 2.614 g·cm-3, μ = 4.526 mm-1, S = 1.035, F(000) = 324, R = 0.0168 and wR = 0.0471 for 1712 observed reflections with I 2λ(I).(Δρ)max = 0.458,(Δρ)min =-0.565 e·-3 and(Δ/σ)max = 0.001. In compound 1, each 3-NPA2- ligand links six Ba(ΙΙ) ions and each Ba(ΙΙ) ion attaches to six 3-NPA2- ligands to form an inorganic layer structure in the ab-plane. The phenyl groups of 3-NPA2- ligands are grafted on the two sides of the inorganic layer, resulting in a two-dimensional(2D) layered structure. Furthermore, the thermal stability and luminescent properties of compound 1 have also been investigated in detail.