Surface modification of polyhedral nanocrystalline MgO with imidazolium carboxylates for dehydration reactions: a new approach

Abstract

The surface of nanocrystalline MgO was modified with achiral and chiral imidazolium carboxylates which generate MgO–[NHC] complexes. Thus as synthesized complexes were utilized in the dehydration of glucose and also in selective dehydration of (±) nitro alcohol.

Covalent Adsorption of N-Heterocyclic Carbenes on a Copper Oxide Surface

“…This strong attachment provides good thermal stability of the ligands, even at temperatures of up to 420 K (section H in the S.I.). Interestingly, the functionalization of oxide surfaces takes place normally with the NHC group forming a metal complex. − In the present study, the carbene centers can bind directly to the O atoms from the Cu x O layer.…”

“…The functionalization of oxide surfaces through the covalent attachment of molecular monolayers has been intensively pursued, leading to very important advances in the fields of optoelectronics, biosensing, and catalysis. − Different approaches were employed to achieve this goal, including the use of silanes, phosphonates, carboxylates, and thiols. ,, N-Heterocyclic carbenes (NHCs) have been successfully employed in the modification of metal surfaces due to their capability of forming strong bonds to metallic centers. − Furthermore, it is possible to tune the binding mode by carefully selecting the side groups . Less common is the attachment of NHC on semiconductors, and the direct binding of NHCs to metal oxides was not reported to date. − In particular, mainly transition-metal NHC complexes were employed to functionalize metal oxide particles. − …”

Surface‐modified NiFe2O4 nanoparticles for the production of biodiesel from fatty acids and microalgae lipids Dunaliella salina

“…21,22 In this direction, several organic and inorganic ligands have been widely used to modify the surface of either metals or metal oxides to obtain highly active catalyst and thereby avoid agglomeration. [23][24][25] Herein, we report the surface modification of various ferrite NPs with 4,4 0 -biphenyldisulfonic acid (BPDSA) to achieve highly active catalyst. We expected both acidic properties due to sulfonic groups, and basic properties of the spinel structure of ferrites may provide highly robust catalyst with good catalytic activity in the esterification of free fatty acids.…”

Nano Metal Oxide Frameworks (NOF): Development of New Heterogeneous Catalyst for the Synthesis of Furan Derivatives from Glucose

“…Herein, we report a synthesis of organic/inorganic nanohybrid materials connecting through a linker via molecular welding of metal oxides. The metal oxides selected in our present case are magnetite (Fe3O4) and magnesium oxide (MgO), as these are easy to synthesize [13,14] and have been used widely in catalysis and other applications. Moreover, to generate a functionalized material (electronically tunable composites), a conductor (magnetite) and an insulator (magnesium oxide) were selected and coupled.…”