Oxidation of phenol, styrene and methyl phenyl sulfide with H2O2 catalysed by dioxovanadium(V) and copper(II) complexes of 2-aminomethylbenzimidazole-based ligand encapsulated in zeolite-Y

Tethering of Cu(II), Co(II) and Fe(III) tetrahydro-salen and salen complexes onto amino-functionalized SBA-15: Effects of salen ligand hydrogenation on catalytic performances for aerobic epoxidation of styrene

“…However, as for Cu-[H 4 ]Salen-SBA, the d-d transition bands shift to higher value of 580 nm as compared to 575 nm in the spectrum of Cu-Salen-SBA, indicating that the environment around copper ions and the stability of tethered copper complexes are changed by C N bond hydrogenation [36]. As for the series of cobalt and iron compounds, intense n-*, -* ligand charge transfer bands in the range of 220-400 nm are present in all cases [14,37], and the d-d transitions are only observed for untethered metal complexes, e.g. 566 and 542 nm for Co-Salen and Co-[H 4 ]Salen (Fig.…”

Zeolite-Y encapsulated metal complexes of oxovanadium(VI), copper(II) and nickel(II) as catalyst for the oxidation of styrene, cyclohexane and methyl phenyl sulfide

“…All other chemicals and solvents used were of AR grade. H 2 sal-oaba (I) [14], [Cu II (sal-oaba)] (2) [15], [Ni II (sal-oaba)(H 2 O) 3 ] (3) [16] and M-Y (M = Cu(II), Ni(II) and OV(IV)) [17] were prepared as described in the literature.…”

“…Zeolite-Y encapsulated Scheme 3. catalyst [VO 2 (sal-ambmz)]-Y and [Cu(sal-ambmz)Cl]-Y (Hsal-ambmz = Schiff base derived from salicylaldehyde and 2-aminomethylbenzimidazole) exhibits ca. 97% and 56.7% conversion of styrene, respectively, using H 2 O 2 as oxidant [17]. Catalyst [Mn(salen)]-Y (H 2 salen = Schiff base derived from salicylaldehyde and ethane-1,2-diaminoethene) exhibits ca.…”

The effect of synthesis method and post-synthesis treatment on the formation of neutral Mn(II) complex into anionic zeolite structure and investigation of its catalytic activity in the epoxidation of alkenes

“…The strong band in the region of 1,000 cm -1 could be attributed to the asymmetric stretching vibrations of (Si/Al) O 4 units (Fig. 2b) [27] where the main bands associated with vibrational transitions of porphyrins can be observed (Fig. 2a).…”