A New Europium Coordination Compound Supported by 4,6-Dibenzoylisophthalic Acid Ligands

A unique metal-organic framework (MOF) [Eu2(L)3(phen)2]n (1, H2L = 4,6-dibenzoylisophthalic acid, phen = 1,10-phenanthroline) has been synthesized under hydrothermal conditions and characterized by single-crystal X-ray analysis, elemental analyses, powder X-ray diffraction, TGA measurement as well as IR spectra. The crystal is of triclinic system, space group P1, C90H52Eu2N4O18, Mr = 1781.32, a = 9.8697(4), b = 16.7466(6), c = 22.2556(10) A, α = 87.113(3), β = 77.575(5), γ = 89.458(3)°, V = 3587.8(3) A, Z = 2, Dc = 1.649 g/cm, F(000) = 1780, μ(MoKα) = 1.813 mm, Rint = 0.0181, R = 0.0260 and wR = 0.0592 for 14000 observed reflections with I > 2σ(I). X-ray analysis shows that the title compound exhibits a 2D layer structure linked by L ligands with two coordination modes and two distinguished conformations, and further linked into a 3D supramolecular architecture through C–H···O weak interactions between hydrogen of phen phenyl ring and the carboxylate oxygen atom of adjacent sheets. In addition, the luminescence property of 1 was investigated.