Ionic liquid/Mn complex immobilized on phenylene based periodic mesoporous organosilica: An efficient and reusable nanocatalyst for green oxidation of alcohols

Synthesis of double-shelled periodic mesoporous organosilica nanospheres/MIL-88A-Fe composite and its elevated performance for Pb2+ removal in water

“…These excellent properties render PMOs attractive for applications in many fields, such as adsorption 47 – 52 , catalysis 91 – 97 , light-harvesting 98 , 99 , electronics 100 – 102 , drug release studies in simulated biological media 103 – 108 , chromatography 109 , enzyme immobilization 110 , 111 , and bactericides 112 , 113 . PMOs have a lot of applications as catalysts in many fields such as the synthesis of dihydropyrano[3,2-c] chromene derivatives 114 , sonogashira reaction 115 , Chan-Lum coupling 116 , condensation of a variety of different aldehydes with malononitrile 117 , Knoevenagel condensation 118 , oxidation of alcohols 119 , 120 , clean production of polyhydroquinolines 121 , and Heck reaction 122 . Also, the application of these materials as adsorbents for selective adsorption and separation of heavy metals (like lead) is considered one of the most attractive research hotspots.…”

“…In this regard, hard acids (such as Mg 2+ , Ca 2+ , and Cr 3+ ) have an affinity for hard bases with high electronegativity; soft acids (such as Hg 2+ , Pd 2+ , and Hg 2+ ) react with soft bases and have a powerful affinity to soft N and O -donor ligands and boundary acids (such as Zn 2+ , Fe 2+ , and Cr 2+ ) react with boundary bases 124 – 126 . PMOs which comprised siloxane units bridged by organic groups, are traditionally synthesized through both sol–gel and grafting methods 119 . The sol–gel process involves mixing the organo-bridged alkoxysilanes (RʹO) 3 Si–R–Si(ORʹ) 3 with copolymers or surfactants as a blocking agent 56 , 127 , 128 .…”

“…The sol–gel process involves mixing the organo-bridged alkoxysilanes (RʹO) 3 Si–R–Si(ORʹ) 3 with copolymers or surfactants as a blocking agent 56 , 127 , 128 . While, in the grafting method, a non-bridged organosilica precursor was attached to a pre-prepared PMO material 119 . By inserting some specific organic groups into the pore walls of PMOs, new silica (nano) materials with both advantages of the organic and inorganic units were obtained 56 , 87 , 127 – 135 .…”

Water compatible silica supported iron trifluoroacetate and trichloroacetate: as prominent and recyclable Lewis acid catalysts for solvent-free green synthesis of hexahydroquinoline-3-carboxamides

“…These catalysts include lanthanide triates, rare earth metal triates, transition metal triates, triuoroacetic acid or trichloroacetic acid, iron tri-uoromethanesulfonate, iron triuoroacetate, lanthanum tri-uoroacetate and lanthanum trichloroacetate. [14][15][16][17][18][19] Additionally, many mesoporous nano organosilica materials were utilized in different organic transformations which includes Pdcontaining IL-based ordered nanostructured organosilica, 20 a Pd-containing magnetic periodic mesoporous organosilica nanocomposite, 21 a Cu-containing magnetic yolk-shell structured ionic liquid based organosilica nanocomposite, 22 highly ordered mesoporous organosilica-titania with an ionic liquid framework, 23 copper/IL-containing magnetic nanoporous MCM-41, 24 core-shell structured Fe 3 O 4 @SiO 2 -supported IL/ [Mo 6 O 19 ], 25 an ionic liquid/Mn complex immobilized on phenylene based periodic mesoporous organosilica, 26 phenylene and isatin based bifunctional mesoporous organosilica supported Schiff-base/manganese complexes, 27 aminefunctionalized ionic liquid-based mesoporous organosilica, 28 magnetic ethylene-based periodic mesoporous organosilica supported palladium, 29 phenylene-based periodic mesoporous organosilica supported melamine, 30 a magnetic silica nanocomposite supported W 6 O 19 /amine, 31 phenyl and ionic liquid based bifunctional periodic mesoporous organosilica supported copper, 32 magnetic silica supported propylamine/ H 3 PW 12 O 40 . 33 The green Lewis acids are highly efficient chemo, regio and stereoselective catalysts for widespread series of organic reactions including Diels-Alder reaction, aldol condensation, Friedel-Cras alkylation, and acylation reaction, Baylis-Hillman reaction, radical addition, Michael reactions, Mannich reaction, alkene alkylation and dimerization, heterocyclic molecule synthesis, Reformatsky reaction, aromatic nitration, sulphonation and bromination reactions, rearrangement reactions, and many multicomponent, cyclization and ring-opening reactions.…”

Cu(II) and Mn(II) Anchored on Functionalized Mesoporous Silica with Schiff Bases: Effects of Supports and Metal–Ligand Interactions on Catalytic Activity

“…The oxidation of cyclohexene has attracted a great deal of attention lately, mainly due to the oxidation products of cyclohexene and the derivatives that provide strongly reactive carbonyl groups in the cycloaddition reactions [ 3 , 4 , 5 , 6 , 7 , 8 ]. Furthermore, the oxidation of alcohols to the corresponding aldehydes, ketones, and carboxylic acids is one of the important reactions in organic chemistry, especially in industrial synthetic chemistry [ 9 , 10 , 11 , 12 , 13 , 14 ]. Transition metal Schiff base complexes, as inorganic mimics of enzymes [ 15 , 16 , 17 , 18 ], have been extensively studied due to their potential use as catalysts in a wide range of oxidation reactions [ 19 , 20 , 21 , 22 , 23 , 24 ] and have the advantage of being prepared using simple and cheap methods.…”