NDLI: Site isolated complexes of late transition metals grafted on silica: challenges and chances for synthesis and catalysis

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Inside back cover

Catalysis Science & Technology Vol - 4 Issue - 8

Catalysis Science & Technology Vol - 4 Issue - 7

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Catalysis Science & Technology Vol -1

Site isolated complexes of late transition metals grafted on silica: challenges and chances for synthesis and catalysis

Content Provider	Royal Society of Chemistry (RSC)
Author	Rimoldi, Martino Mezzetti, Antonio
Copyright Year	2014
Abstract	Transition metal (TM) ions can be covalently attached to a silica surface by means of a M–OSi bond (grafting) to give site-isolated complexes. Acting as a ligand in such grafted species, the surface influences the electronic nature and the coordination number of the TM ion, in contrast to anchored complexes, in which a linker separates the metal ion and the surface and hence reduces their interaction. This perspective reviews general grafting strategies on an oxide surface and focuses on the peculiarity of silica-grafted catalysts of late TMs, which have a higher tendency to undergo aggregation into metal nanoparticles under reducing conditions than early TMs. Soft ligands (hydride, phosphines) and/or π-acceptors (CO) promote aggregation. In particular, silica-grafted hydride complexes of late TM ions are not stable and tend to undergo reductive elimination of silanol. The coordination chemistry background of this behaviour is discussed, and possible strategies to avoid aggregation are suggested.
Starting Page	2724
Ending Page	2740
Page Count	17
File Format	HTM / HTML PDF
ISSN	20444753
Volume Number	4
Issue Number	9
Journal	Catalysis Science & Technology
DOI	10.1039/c4cy00450g
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Silanol Coordination number Oxidative addition Ligand Covalent bond Ion Transition metal Hydride Grafting Silicon dioxide Coordination complex
Content Type	Text
Resource Type	Article
Subject	Catalysis

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