Copper oxide surfaces modified by alkylphosphonic acids with terminal pyridyl-based ligands as a platform for supported catalysis

Hemimorphite Flotation with 1-hydroxydodecylidene-1,1-diphosphonic acid and Its Mechanism

“…The absorption peaks at 1060 and 922 cm −1 represented the symmetric and asymmetric stretching vibrations of -P-O-bonds in the -P(=O)OH groups and those at around 1290 and 1160 cm −1 were related to the P=O and the P=O in condition of hydrogen bond [37,42,44], respectively. After reaction with Zn 2+ , the -P-O-absorption peak at 922 cm −1 for HDDPA dramatically weakened and shifted to 960 cm −1 , and that at 1060 cm −1 moved to 1080 cm −1 in the Zn-HDDPA precipitates, suggesting the formation of the P-O-Zn bond [45]. Additionally, the peaks at around 1160, 1290, 2240, 3228 and 3540 cm −1 for HDDPA almost disappeared.…”

Desorption of carboxylates and phosphonates from galvanized steel: Towards greener lubricants

“…Functionalization of surfaces with chemisorbed molecules is an attractive route to tailor interfacial properties such as lubricity and wetting . Self‐assembled monolayers (SAMs) have been widely used in recent years to this end due to their durability and relative ease of preparation .…”

“…Self‐assembled monolayers (SAMs) have been widely used in recent years to this end due to their durability and relative ease of preparation . Reports shows that SAMs form on a variety of surfaces; eg, Al 2 O 3 or copper oxide, SiO 2 , and metals like Au and Ag . Molecules that form SAMs possess a linker group that can interact with surface sites (eg, CO 2 H or SH) and an alkyl or perfluoroalkyl chain that points away from the surface .…”

“…SAMs are reported to lower the coefficient of friction (μ) of substrates by a molecular spring mechanism, where the orientation of the spacer chains reduces interfacial shear forces . Hence, SAMs have been cited as possible lubricants for small length scales tribological contacts; eg, micro/nano‐electromechanical systems (MEMS/NEMS) and in sheet metal forming processes which are used in the automotive, building, and aviation industries to create shaped components.…”

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.…”