Ionothermal Syntheses and Crystal Structures of Two 1D Inorganic-Organic Hybrid Frameworks

Two 1D inorganic-organic hybrid frameworks, namely, [Zn(5-NO2-bdc)(MIM)(3)center dot H2O](n)(1) and [Cd(MIM)(2)Br-2](n)(2) (5-NO2-bdcH(2) = 5-nitro-1,3-benzenedicarboxylic acid, MIM = N-methyl imidazole) were synthesized via ionothermal reactions with ionic liquid 1-ethyl-3-methylimidazolium bromide ([EMIM]Br) as solvent and template. Both compounds have been characterized by elemental analyses, spectroscopic analyses, thermogravimetric analysis (TGA) and the single crystal diffraction. The zinc(II) center in compound 1 is a slightly distorted five-coordinate trigonal bipyramid, 5-NO2-bdc(2-) anions and MIM moieties effectively bridge Zn centers to result in 1D zigzag chains. While Cd(II) center in compound 2 is in an octahedral coordination environment, and two mu(2)-bridge bromine link two [Cd(MIM)(2)] moieties to form a 1D chain structure. In addition, complex 2 exhibits strong fluorescent emission in the solid state at room temperature.