A 2D Zn(II) metal-organic framework constructed from 4,4′-(perfluoropropane-2,2-diyl)dibenzoic acid, synthesis, structure and photoluminescence

Abstract

A Zn(II) metal-organic framework (MOF) [Zn₂(FPDB)₂(pyridine)₂] · 5H₂O (1) was synthesized solvothermally via reaction of Zn(ClO₄)₂ · 6H₂O and 4,4′-(perfluoropropane-2,2-diyl)dibenzoic acid (H₂FPDB). The X-ray single crystal diffraction analysis reveals that 1 crystallizes in monoclinic C2/c space group with a = 23.279(5) Å, b = 7.837(5) Å, c = 26.776(5) Å, β = 106.7(6)° and Z = 4. In 1, two adjacent zinc ions are bridged to form a dinuclear paddle-wheel SBU, and four neighboring SBUs are linked by FPDB ligands to construct a chair-type grid. Distorted grids extended along a and b axes to complete a double-sheet 2D layer and these layers stack with van der Waal's interactions to build the final structure. Compound 1 shows strong luminescence at room temperature in the solid state, suggesting that 1 may be an excellent fluorescent material.

Keywords:

• Solvothermally
• Metal-organic framework
• Trifluoromethyl
• Carboxylate
• Paddle-wheel
• SBU
• Photoluminescence

Acknowledgment

This work was supported by the Natural Science Foundation of Xinjiang Normal University.