A Partially Fluorinated Three-fold Interpenetrated Stable Metal- Organic Framework with Selective CO2 Uptake

作者：Santra Atanu; Lah Myoung Soo^*; Bharadwaj Parimal K

来源：Zeitschrift fur Anorganische und Allgemeine Chemie, 2014, 640(6): 1134-1140.

DOI：10.1002/zaac.201300639

• Metal-organic frameworks
• Fluorinated ligands
• Selective CO2 adsorption
• Photoluminescence

The hydrothermal reaction of Zn(NO3)(2)center dot H2O and a linear 2, 2'-bis-trifluoromethyl-biphenyl-4, 4'-dicarboxylic acid (H2L) ligand with -CF3 groups at each phenyl moiety of the biphenyl rings leads to the formation of a three-fold interpenetrated metal-organic framework (MOF), {[Zn2.66O0.66(L)(2)]center dot 2H(2)O}(n) (1) at 180 degrees C. Single-crystal X-ray diffraction studies revealed that 1 is constructed from polynuclear clusters [Zn4O(COO)(6)] as secondary building units (SBU). These SBU are connected through the L2- to generate an overall three-dimensional structure with a 6-connected primitive cuboidal (-Po) network. Thermogravimetric analyses and variable temperature powder X-ray diffraction measurements suggested that 1 is thermally stable. The porosity of 1 was estimated by N-2, CO2, H-2, and CH4 at different temperatures. The framework showed high selectivity of CO2 uptake over N-2 and CH4. Furthermore, solid-state photoluminescence studies were carried out for complex 1 upon excitation at 275 nm at room temperature.

• 出版日期2014-5