Porous Two-Dimensional Monolayer Metal−Organic Framework Material and Its Use for the Size-Selective Separation of Nanoparticles
Y. Jiang, G. H. Ryu, Se. H. Joo, X. Chen, S. H. Lee, X. Chen, M. Huang, X. Wu, D. Luo, Y. Huang, J. H. Lee, B. Wang, X. Zhang, S. K. Kwak, Z. Lee and R. S. Ruoff
ACS. Appl. Mater. Interfaces 9,28107 (2017)
Rational bottom-up construction of two-dimensional
(2D) covalent or noncovalent organic materials with
precise structural control at the atomic or molecular level
remains a challenge. The design and synthesis of metal−
organic frameworks (MOFs) based on new building blocks is
of great significance in achieving new types of 2D monolayer
MOF films. Here, we demonstrate that a complexation
between copper(II) ions and tri(β-diketone) ligands yields a
novel 2D MOF structure, either in the form of a powder or as
a monolayer film. It has been characterized by Fourier
transform infrared, Raman, ultraviolet−visible, X-ray photoelectron,
and electron paramagnetic resonance spectroscopies. Selected area electron diffraction and powder X-ray diffraction
results show that the MOF is crystalline and has a hexagonal structure. A MOF-based membrane has been prepared by vacuum
filtration of an aqueous dispersion of the MOF powder onto a porous Anodisc filter having pore size 0.02 μm. The porous MOF
membrane filters gold nanoparticles with a cutoff of ∼2.4 nm.