Epoxidation of Styrene by Fe, Mn, and V Metalloporphyrins Encapsulated Si, Al, Ti And V- Mcm-41

Abstract

Iron(III), Mn(III) and VO(IV) metalloporphyrin complexes have been encapsulated into ordered hexagonal mesoporous molecular sieves. The encapsulation is effective due to the electrostatic attraction of quaternary ammonium sites present in the porphyrin and the Brönsted/ Lewis acid sites present in the mesoporous molecular sieves. These heterogeneous catalysts were catalytically active for the epoxidation of styrene with PhIO exhibiting different selectivity and negligible leaching of active species. The heterogeneous catalysts were reused three times with a slighter decrease in activity but the selectivity patterns were maintained during the recycling experiments.

Highly Efficient Light‐Driven CO2 to CO Reduction by an Appropriately Decorated Iron Porphyrin Molecular Catalyst

“…The positively charged catalyst [Fe III (TMAP)]Cl 5 was prepared according to the literature. [32] All the final iron catalysts were characterized through 1 H and 19 F NMR and UV-Vis absorption spectroscopy measurements and the recorded spectra are in accordance with the already reported data (See Supporting Information for NMR (Figures S14-S22) and UV-Vis absorption (Figures S23-S26) spectra and HRMS data (Table S7)). In addition, we performed the magnetic characterization of [Fe III (TF 4 TMAP)](CF 3 SO 3 ) 5 , [Fe III -(TF 4 -DMAP)]Cl and [Fe III (TMAP)]Cl 5 to get insight into their ground spin states.…”

“…Moreover, during the intermediate steps of this synthetic procedure, we isolated the two non‐charged reference derivatives [Fe III (TF 5 PP)]Cl and [Fe III (TF 4 ‐DMAP)]Cl , that were also examined as catalysts towards photocatalytic CO 2 reduction. The positively charged catalyst [Fe III (TMAP)]Cl 5 was prepared according to the literature [32] . All the final iron catalysts were characterized through 1 H and 19 F NMR and UV‐Vis absorption spectroscopy measurements and the recorded spectra are in accordance with the already reported data (See Supporting Information for NMR (Figures S14–S22) and UV‐Vis absorption (Figures S23–S26) spectra and HRMS data (Table S7)).…”

“…[Ir(ppy) 2 (bpy)]PF 6 was purchased from commercial sources and used without further purification. The iron catalysts [Fe III (TF 5 PP)]Cl , [38] [Fe III (TMAP)]Cl 5 , [31,32,39] [Fe III (TF 4 ‐DMAP)]Cl [31b,40] and [Fe III (TF 4 TMAP)](CF 3 SO 3 ) 5 [31b] were prepared as previously reported in the literature.…”

Energy efficient electrochemical reduction of CO2 to CO using a three-dimensional porphyrin/graphene hydrogel

“…3a). 31 However, the absorption peak observed at 412 nm was shifted toward higher wavelength of 432 nm in FePGH, attributed to the interaction between FeTMAP and rLCGO via p-p and electrostatic interactions. 32 This 20 nm redshift is slightly larger than that for the iron porphyrin/graphene framework FePGF, which was likely caused by increased reduction and resulting larger aromatic regions affording increased p-p interactions.…”

Characterization of Mo-MCM-41 and its Electrochemical Sensing Property

“…These mesoporous materials with large pores (20-100 Å) are suitable for the transformation of bulky organic compounds. [5][6][7] Oxidation properties of metal ions such as Ti, V, Cr, Mn, Ce, Sn, and Mo [8][9][10][11][12][13] incorporated into the MCM-41 framework have been reported by the researchers which attracts for further modifications. In addition, there were materials with molybdenum incorporation, such as Mo-HMS, Mo-SBA-15, and Mo-MCM-41, [14] which were synthesized easily.…”