Recyclable polymer-supported iridium-based photocatalysts for photoredox organic transformations

Supported nanostructured photocatalysts: the role of support-photocatalyst interactions

“…To attain better applicability and improve the recyclability of semiconductor photocatalysts on a larger and economically feasible scale, the immobilization of metal oxide/ sulfide nanomaterials on some suitable substrate has been an increasing area of research. Photocatalytic nanomaterials have been coated on adequate support materials such as SiO 2 , glass beads, optical fibers, magnetite particles, zeolites, and polymeric materials, among others [27,28,33,34,37,[105][106][107][108]. For example, when small (< 15 nm) TiO 2 particles are supported on sub-micron size SiO 2 particles, their separation from aqueous media becomes easier due to the overall increase in particle size of silica-supported TiO 2 , unlike the unsupported TiO 2, which is difficult and costly to separate from reaction media, be it through centrifugation, decantation or filtration.…”

An Ir(iii) cyclometalate-functionalized molecularly imprinted polymer: photophysics, photochemistry and chemosensory applications

“…1b). 22 In addition, the characteristic charge transfer absorption of the Ir( iii ) complex in the visible region, observed in the diffuse reflectance measurement of PTMA-Ir , provides further evidence of immobilization (Fig. S3†).…”

“…With the benzyl chloride functional group on PTMA , a hydroxyl-functionalized phosphorescent Ir( iii ) complex ( Ir-1 ) can be covalently attached to it through an ether linkage by nucleophilic substitution reaction 22 to serve as the emissive reporter for the binding event of PTMA (Scheme 1b). After decoration with phosphorescent Ir( iii ) cyclometalate, the polymer ( PTMA-Ir ) displays phosphorescence with emissive characteristics similar to other polymers immobilized with Ir-1 22 and Ir-2 (Fig. 1a), while the microscopic morphology was unaffected (Fig.…”

Development of heterogeneous photocatalystsviathe covalent grafting of metal complexes on various solid supports

“…Similarly, Ko and co-workers developed efficient and recyclable heterogeneous photoredox catalysts by directly grafting homogeneous iridium metal complexes on various polymer support materials, including a bulk polymer, porous polymer and polymer microspheres. 106 This group utilized the highly efficient catalyst for (i) addition reaction between phenylacetylene and perfluorohexyl iodide and (ii) amidation reaction of n -butylamine with perfluorohexyl iodide (Fig. 24).…”