Construction of porous organic polymers (POPs) as metal-free heterogeneous organic photocatalysts for highly efficient catalytic organic transformations using visible light remains a key challenge. Herein, we report the “bottom-up” strategy to facilely synthesize two Eosin Y dye-based POP frameworks (EY-POPs) for highly efficient heterogeneous organic-photocatalysis. Owing to the high BET surface area and the built-in character of the covalently linked catalytic sites of EY-POPs, these photoactive polymers show excellent catalytic activity in photocatalyzing the aza-Henry reaction. The superior utility of the EY-POP-1 polymer in catalysis was demonstrated by the broad scope of the reactants and the high yield of the reaction products. Moreover, the EY-POP-1 polymer shows robust recycling capability with good retention of photoactivity over at least twelve cycles without any significant loss of the catalytic activity (94–98% yield).

MOFs (metal–organic frameworks) are widely utilized as both the templates and precursors to prepare nanomaterials as supercapacitor electrodes. However, traditional thermolysis routes are difficult to control and usually lead to collapse of the MOF skeletons, which hinders wider applications. Herein, we describe a simple and facile strategy for fabricating the Ni(OH)₂ hierarchical structure by the “conformal transformation” of one particular Ni-MOF through hydrolysis in the KOH aqueous solution. By controlling the concentration of KOH solution and the soaking time, the obtained Ni(OH)₂ nanomaterial possesses both optimized crystallinity and porosity, extremely beneficial for electron transportation and ion migration within the electrodes. Taking these advantages, the Ni(OH)₂ electrode presents a remarkable specific capacity of 830.6 C g⁻¹, and the fabricated all-solid state asymmetric supercapacitor presents a remarkable energy density of 37.8 W h kg⁻¹ at a power density of 252.67 W kg⁻¹, which surpasses most Ni(OH)₂ based supercapacitor devices. After 15 000 cycles, the capacitance remains at over 93% of the initial value.

By tuning interpenetrated and non-interpenetrated frameworks, a pair of Cu-paddlewheel framework-interpenetration isomers (UPC-34, [Cu₃(L)₂(H₂O)₃]·2DMF·3EtOH·3H₂O and UPC-35, [Cu₃(L)₂(H₂O)₃]·2DMF·2Diox·3H₂O) based on a tripodal ligand (H₃L = 4,4′-((5-carboxy-1,3-phenylene)bis(ethyne-2,1-diyl))dibenzoic acid) has been synthesized and characterized. The interpenetrated framework (UPC-35) is more stable than the non-interpenetrated one (UPC-34). Due to the 2-fold interpenetration, UPC-35 has a pore size distribution of ∼4.5 Å, which is close to the kinetic diameters of light hydrocarbons (C₁–C₃), and thus exhibits high gas-uptake capacities for C₃H₆ and C₃H₈. Furthermore, UPC-35 is an effective adsorbent for the selective separation of C₃/C₂/C₁ light hydrocarbons.

Phenanthroline-based microporous organic polymer (Phen-MOP) is synthesizedviaa cost-effective method based on the Scholl reaction. After post-modification with Pd(OAc)₂, the synthesizedPhen-Pd-MOPis a highly efficient heterogeneous catalyst for C–C coupling reactions.

In this work, Eu-MOF has been synthesized and has excellent luminescence recognition ability for Fe³⁺ and TNP with good selectivity and high sensitivity via luminescence quenching.