A new lanthanide coordination polymer with 4,4′-oxybis (benzoic acid) ligand: Hydrothermal synthesis, crystal structure and photoluminescence

摘要

Self-assemblies of the organic ligand 4,4′-oxybis(benzoic acid) with metal salt (Eu~(3+)) have led to one new complex, namely, Eu(oba) 2(phen) (1) (oba = 4,4′-oxybis (benzoic acid), phen = 1,10-phenanthroline). The structure was determined by single crystal X-ray crystallography and further characterized by elemental analysis and IR spectra. X-ray diffraction analysis reveals that it crystallizes in the monoclinic C2/c space group with a = 13.4943(12) ?, b = 19.3737(18) ?, c = 27.359(2) ?, β = 99.539°, V = 7053.7(1) ?3, Z = 8, μ = 1.862, F(000) = 3376. The Eu(III) ions along the a-axis are bridged by oba ligand into infinite oval-like one-dimensional chain. Interestingly, because of the existing of hydrogen bonging (O5-H5?O6), the title complex further formed a 2D layer structure with an interlayer separation of ca. 19.3737(18) ?. The complex exhibits excellent fluorescence property. Graphical Abstract: A novel europium complex Eu(oba)2(phen) (1) [oba = 4,4′-oxybis (benzoic acid), phen = 1,10-phenanthroline], which obtained by hydrothermal synthesis method and the structure was determined by single crystal X-ray crystallography. The photoluminescence spectra of the complex in the solid state at room temperature was investigated and it exhibits excellent fluorescence property.