A Three-dimensional Tm(Ⅲ)-Zn(Ⅱ) Heteronuclear Metalorganic Framework Based on Imidazole-dicarboxylate Ligand:Synthesis,Crystal Structure and Luminescence Property

A d-f heteronuclear metal-organic framework（MOF）,{[Tm;Zn;（bipy;）;（mimda）;（H;O）;]·（H;O）;};（1,H3 mimda = 2-methyl-1-H-imidazole-4,5-dicarboxylic acid,and bipy = 4,4?-bipyridine）,has been synthesized under solvothermal conditions,and structurally characterized by elemental analysis,IR spectra and X-ray single-crystal diffraction.It crystallizes in orthorhombic system,space group Pnma with a = 16.1102（9）,b = 33.5805（19）,c = 16.8593（10） ?,β = 97.344（11）°,V = 9120.7（9） ?;,Z = 4,F（000） = 5184,the final R = 0.0530 and w R = 0.1306.In complex 1,the Tm（Ⅲ） ions adopt two types of coordination fashions.Complex 1 shows onedimensional（1-D） Tm-Zn heteronuclear zigzag chains,and these chains are further linked by H3 mimda ligands into Tm-Zn heteronuclear 2-D lattice-like arrays.The 2-D heteronuclear units were connected through [Zn;（mimda）;] rings to give rise to the Tm-Zn heteronuclear cages.Finally,H3 mimda ligands connected the cages into a 3-D heterometallic framework by the combination of [TmO;];and Tm-Zn heteronuclear cages.In addition,the thermal stability and luminescent property have been investigated.