Immobilization of copper complexes with (1,10-phenanthrolinyl)phosphonates on titania supports for sustainable catalysis

Abstract

Immobilization of copper complexes with 1,10-phenanthroline functionalized by phosphonate anchoring groups was investigated to prepare porous and reusable catalysts for Sonogashira-type and Huisgen cycloaddition reactions.

Catalytic CO Oxidation and H2O2 Direct Synthesis over Pd and Pt-Impregnated Titania Nanotubes

“…Thus, TiO2 with a specific surface area < 300 m 2 /g was observed most often [19][20][21][22][23]. Values of about 300 m 2 /g were, however, only reported for nanorods and microspheres [24,25], as well as for TiO2-SiO2 composite xerogels [26,27]. Table 1.…”

Recent achievements in copper catalysis for C–N bond formation

“…For this purpose we developed a synthetic approach to phosphonate-substituted 1,10-phenanthroline derivatives [4], investigated their coordination [85,86] and catalytic properties of related copper(I) complexes [87]. These complexes are efficient catalyst for a wide range of catalytic reactions including C-N coupling and can be immobilized on titania oxide supports [88]. In order to investigate the possibilities of the heterogenized copper catalysts to promote various coupling reactions, at first the synthesis of Cu(I) complexes with 1,10-phenanthrolines with the phosphoryl groups at positions 2, 3, 4, and 5 was undertaken [87].…”

Phosphonate‐Mediated Immobilization of Rhodium/Bipyridine Hydrogenation Catalysts

“…Grafting molecular catalysts onto surfacest of orm heterogeneous systems offerss everalp otential advantages, including easier product separation and catalyst recovery.C ommon routes for immobilizing molecular catalystsi nclude their incorporation into organic polymers [1] and their adsorptiono nto high surfacea rea inorganic frameworkss uch as zeolites and mesoporousm icelle-templated materials, silica, or otherm etal oxides. [2][3][4][5][6][7][8][9] Another strategy is derivatization of solid materials with molecular catalysts, which consists of grafting appropriate functional molecules onto the surface and provides improved control of the arrangemento ft he organic component at the surface.G rafting of organometallic catalysts in acontrolled and stablem anner requires the presence of functional groups that vary accordingt ot he chemical nature of the solid support to be modified.S ome of the most popular combinations are thiol/gold, [10] SiH 3 ,S i(OR) 3 ,o rS iCl 3 /silica or glass, [11][12][13] and P(O)(OR) 2 (R = Ho ra lkyl)/metal oxides [14][15][16][17][18][19][20][21][22][23][24][25] or any type of materialsc ontaining surface-exposed metal centers. [26] Immobilizedcatalysts usually mirrorthe behavior of their homogeneous counterparts, but the accessibility of the catalytic site can be altered by the orientationo ft he catalyst with respect to the surfaceo rb ya ggregation,w hich results in lower reactionr ates.…”

“…Grafting of organometallic catalysts in a controlled and stable manner requires the presence of functional groups that vary according to the chemical nature of the solid support to be modified. Some of the most popular combinations are thiol/gold, SiH 3 , Si(OR) 3 , or SiCl 3 /silica or glass, and P(O)(OR) 2 (R=H or alkyl)/metal oxides or any type of materials containing surface‐exposed metal centers …”