Transition from a 1D Coordination Polymer to a Mixed-Linker Layered MOF

Abstract

A novel copper­(II) metal–organic framework (MOF) has been synthesized by modifying the reaction conditions of a 1D coordination polymer. The 1D polymer is built by the coordination between copper and 2,2′-(1H-imidazole-4,5-diyl)­di-1,4,5,6-tetrahydropyrimidine (H-L1). The geometry of H-L1 precludes its ability to form extended 3D framework structures. By adding 1,4-benzenedicarboxylic acid (H2BDC), a well-studied linker in MOF synthesis, we achieved the transition from a 1D polymer chain into porous 2D layered structures. Hydrogen bonding between L1 and BDC directs the parallel stacking of these layers, resulting in a 3D structure with one-dimensional channels accessible by two different pore windows. The preferred growth orientation of the crystal produces prolonged channels and a disparity in pore size distribution. This in turn results in slow diffusion processes in the material. Furthermore, an isoreticular MOF was prepared by substituting the BDC linker by 2,6-naphthalenedicarboxylic acid (H2NDC).

Two-Dimensional Metal-Organic Framework Materials: Synthesis, Structures, Properties and Applications

“…Interestingly, Zn-SBF-2 complex displays similar rows with alternating monodentate and bidentate carboxylates along both the directions of the grid, while Zn-SBF-3 complex shows two different rows, one with only bidentate and the other with only monodentate carboxylates along two directions of the grid. Many other sql nets have been given in the literature. − …”

Transformation of a copper-based metal–organic polyhedron into a mixed linker MOF for CO2 capture

“…36 This aids MOF synthesis by giving more directionality for attaining the desired framework net, making this technique highly useful in designing new structures that are otherwise difficult to synthesize. [37][38][39][40][41] The copper MOP-1 structure consists of m-BDC and copper paddlewheels as shown in Fig. 1.…”

“…36 This aids MOF synthesis by giving more directionality for attaining the desired framework net, making this technique highly useful in designing new structures that are otherwise difficult to synthesize. 37–41…”

Amino‐Induced 2D Cu‐Based Metal–Organic Framework as an Efficient Heterogeneous Catalyst for Aerobic Oxidation of Olefins

“…[15] So far, af ew strategies have been appliedt os olve the above problem. [16][17][18][19][20] Ones trategy is to introduce MOPsi nto nanoporous silica and confine the MOPs in its channels or cavities, [21,22] and the other is to use MOPs as porous monomers to further convert them into metal-organic frameworks (MOFs)o rs upramolecular polymers. [23][24][25][26] Although significantp rogresses have been made, the exploration of new strategies is still ah ot researcht opic.…”

“…However, the disadvantages of poor stability and easy aggregation limit the application of MOPs, especially the removal of the guest molecules would inevitably result in the aggregation of MOP molecules and the inaccessibility of active sites . So far, a few strategies have been applied to solve the above problem . One strategy is to introduce MOPs into nanoporous silica and confine the MOPs in its channels or cavities, and the other is to use MOPs as porous monomers to further convert them into metal–organic frameworks (MOFs) or supramolecular polymers .…”