Rapid Microwave Synthesis and Purification of Porous Covalent Organic Frameworks

Rapid Microwave Synthesis and Purification of Porous Covalent Organic Framework

Functionalized Conjugated Microporous Polymers

A range of conjugated microporous polymer networks has been prepared using Sonogashira−Hagihara cross-coupling of 1,3,5-triethynylbenzene with a number of functionalized dibromobenzenes. Porous poly(arylene ethynylene) networks with surface areas up to 900 m2/g were produced. The surface chemistry of the networks was varied by monomer selection, thus allowing control over physical properties such as hydrophobicity. Additionally, it was shown that the dye sorption behavior of the networks can be controlled by varying the hydrophobicity. This expands significantly on the utility of this approach, allowing high surface area networks to be prepared with properties that can be tailored for applications such as catalysis and separations

Palladium Nanoparticle Incorporation in Conjugated Microporous Polymers by Supercritical Fluid Processing

Palladium nanoparticles have been dispersed uniformly throughout a microporous poly(aryleneethynylene) material by the infusion of a CO2-soluble Pd precursor. The resulting composite has good thermal stability and has potential applications for example in heterogeneous catalysis. The porosity of the polymeric support was maintained after inclusion of the metal and the hydrogen uptake at room temperature was increased with respect to the unloaded porous support

Metallo-Cryptophanes Decorated with Bis-N-Heterocyclic Carbene Ligands: Self-Assembly and Guest Uptake into a Nonporous Crystalline Lattice

Pd₃L₂ metallo-cryptophane cages with cyclotriveratrylene-type L ligands can be stabilized by use of a bis-N-heterocyclic carbene as an auxiliary <i>cis</i>-protecting ligand, while use of more common protecting chelating ligands such as ethylenediamine saw a Pd₃L₂ to Pd₆L₈ rearrangement occur in solution. The crystalline Pd₃L₂ complexes act as sponges, taking up 1,2-dichorobenzene or iodine in a single-crystal-to-single-crystal fashion despite not exhibiting conventional porosity

Structurally Diverse Covalent Triazine-Based Framework Materials for Photocatalytic Hydrogen Evolution from Water

A structurally diverse family of 39 covalent triazine-based framework materials (CTFs) are synthesized by Suzuki–Miyaura polycondensation and tested as hydrogen evolution photocatalysts using a high-throughput workflow. The two best-performing CTFs are based on benzonitrile and dibenzo­[b,d]­thiophene sulfone linkers, respectively, with catalytic activities that are among the highest for this material class. The activities of the different CTFs are rationalized in terms of four variables: the predicted electron affinity, the predicted ionization potential, the optical gap, and the dispersibility of the CTFs particles in solution, as measured by optical transmittance. The electron affinity and dispersibility in solution are found to be the best predictors of photocatalytic hydrogen evolution activity

Metallo-Cryptophanes Decorated with Bis-N-Heterocyclic Carbene Ligands: Self-Assembly and Guest Uptake into a Nonporous Crystalline Lattice

Pd₃L₂ metallo-cryptophane cages with cyclotriveratrylene-type L ligands can be stabilized by use of a bis-N-heterocyclic carbene as an auxiliary <i>cis</i>-protecting ligand, while use of more common protecting chelating ligands such as ethylenediamine saw a Pd₃L₂ to Pd₆L₈ rearrangement occur in solution. The crystalline Pd₃L₂ complexes act as sponges, taking up 1,2-dichorobenzene or iodine in a single-crystal-to-single-crystal fashion despite not exhibiting conventional porosity

Metallo-Cryptophanes Decorated with Bis-N-Heterocyclic Carbene Ligands: Self-Assembly and Guest Uptake into a Nonporous Crystalline Lattice

Pd₃L₂ metallo-cryptophane cages with cyclotriveratrylene-type L ligands can be stabilized by use of a bis-N-heterocyclic carbene as an auxiliary <i>cis</i>-protecting ligand, while use of more common protecting chelating ligands such as ethylenediamine saw a Pd₃L₂ to Pd₆L₈ rearrangement occur in solution. The crystalline Pd₃L₂ complexes act as sponges, taking up 1,2-dichorobenzene or iodine in a single-crystal-to-single-crystal fashion despite not exhibiting conventional porosity

Synthesis of a Large, Shape-Flexible, Solvatomorphic Porous Organic Cage

Porous organic cages have emerged over the last 10 years as a subclass of functional microporous materials. However, among all of the organic cages reported, large multicomponent organic cages with 20 components or more are still rare. Here, we present an [8 + 12] porous organic imine cage, CC20, which has an apparent surface area up to 1752 m2 g–1, depending on the crystallization and activation conditions. The cage is solvatomorphic and displays distinct geometrical cage structures, caused by crystal-packing effects, in its crystal structures. This indicates that larger cages can display a certain range of shape flexibility in the solid state, while remaining shape persistent and porous

Metallo-Cryptophanes Decorated with Bis-N-Heterocyclic Carbene Ligands: Self-Assembly and Guest Uptake into a Nonporous Crystalline Lattice

Pd₃L₂ metallo-cryptophane cages with cyclotriveratrylene-type L ligands can be stabilized by use of a bis-N-heterocyclic carbene as an auxiliary <i>cis</i>-protecting ligand, while use of more common protecting chelating ligands such as ethylenediamine saw a Pd₃L₂ to Pd₆L₈ rearrangement occur in solution. The crystalline Pd₃L₂ complexes act as sponges, taking up 1,2-dichorobenzene or iodine in a single-crystal-to-single-crystal fashion despite not exhibiting conventional porosity