Synthesis and characterization of a new epoxidation catalyst by grafting cis-MoO2(salpr) complex to functionalized MCM-41

Periodic mesoporous organosilicas with bis(8-quinolinolato) dioxomolybdenum(VI) inside the channel walls

“…3, all samples with different Mo contents possess monomodal and quite narrow pore size distributions centered at ca. 24-25 Å, which is different from the significant pore size decrease occurring by terminal bonding of Mo complexes to the pore surface, indicating that Mo complexes distributed homogeneously in the framework and thus overcame the pore blockage [29], though the content of Mo species introduced increases.…”

Organically modified MCM-type material preparation and its usage in controlled amoxicillin delivery

“…SiMCM-41 was prepared according to the reported method [20], and surfactant was removed to release the mesoporous structure by calcinations at 550°C for 4 h. CPTMS and APTMS were anchored onto the silica surface via post-grafting procedure [21,22], i.e., after SiMCM-41 (4 g) was loaded in dry toluene (70 ml), CPTMS (16 mmol) or APTMS (16 mmol) was added, and mixture was refluxed for 6 h. The precipitate was filtered and dried which was referred as PClMCM-41 or PNH 2 MCM-41.…”

Recent Progress in the Heterogenization of Complexes for Single‐Site Epoxidation Catalysis

“…[41] The salpr/MCM-41 material was then reacted with MoO 2 (acac) 2 The same group also reported the condensation of acetylacetone with aminopropyl groups grafted on MCM-41 giving Schiff bases, which were further reacted with amino acids to form heterogenized N,NЈ-bidentate ligands. [42] Complexation of these Schiff-base ligands with MoO 2 (acac) 2 resulted in heterogenized epoxidation catalysts (Scheme 10).…”

“…No apparent leaching of the active tungsten species could be detected under optimized reaction conditions. Similarly Masteri-Farahani et al could synthesize heterogenized dioxidotungsten catalyst of the type WO 2 -(salpr)/MCM-41 by repeating the process published for molybdenum [41] with an appropriate tungsten precursor. [65] However, here tBuOOH is used as the oxidizing agent as for molybdenum.…”