Two dimensional coordination polymers based on 3,5-di(1H-imidazol-1-yl)pyridine and their fluorescence properties

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The solvothermal synthesis of three new 2D MOFs is reported. From the reaction of 3,5-di(1H-imidazol-1-yl)pyridine (dip) and the metal salts Co(NO3)2·6H2O, Cd(NO3)2·4H2O or Zn(NO3)2·4H2O, the three MOFs [Co(dip)2(SCN)2] (1), {[Cd(dip)2(H2O)2]·(NO3)2} (2), {[Zn(dip)2(H2O)2]·(ClO4)2} (3) were obtained. For these 2D MOFs, all the metal ions adopt a six-coordinate octahedral geometry with axial coordination sites occupied by SCN− or water molecules. The SCN−/water ligands were all mono-coordinate and led to layered MOF structures. Furthermore, the fluorescence properties of 2 and 3 have been investigated.