Silica-bound copper(ii) triazacyclononane: a robust material for the heterogeneous hydrolysis of a phosphodiester

Bodsgard, Brett R.; Burstyn, Judith N.

doi:10.1039/b005264g

Cited by 43 publications

(18 citation statements)

References 11 publications

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“…In particular, the direct siliconcarbon bond shows a higher stability against hydrolysis than the siloxane links obtained by the silylation method 16. 18, 36 A variety of methods37 involving catalytic4, 18, 38 or radical1, 39 mechanisms have been described to produce SiC bonds from SiH groups on silica surfaces.…”

Section: Introductionmentioning

confidence: 99%

High‐Temperature Chlorination‐Reduction Sequence for the Preparation of Silicon Hydride Modified Silica Surfaces

Plumeré¹,

Speiser²,

Mayer³

et al. 2009

Chemistry A European J

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A general method for the functionalization of silica surfaces with silicon hydride (Si-H) groups is described for four different preparations of silica. The silica surface is reduced in a two-step chlorination-reduction procedure within a simple gas-flow system at high temperatures. After initial dehydroxylation of the silica surface, silicon chloride groups are formed by the reaction with thionyl chloride. The chlorination activates otherwise inaccessible surface siloxane moieties. A high silicon-hydride surface concentration results from the subsequent reduction of the chlorinated surface with hydrogen. The physical properties of the resulting silica are analyzed using scanning electron microscopy, as well as dynamic light scattering and Brunauer-Emmet-Teller measurements. The chlorination-reduction sequence has no significant impact on the structure, surface area and mesopore size of the silica materials used. The surface of the materials is characterized by diffuse reflectance infrared Fourier transform (DRIFT) and (29)Si CP/MAS NMR spectroscopy. The silicon-hydride groups are mostly of the ${{\rm T}{{3\hfill \atop {\rm H}\hfill}}}$-type. The use of high temperatures (>800 degrees C) results in the condensation of internal and surface silanol groups. Therefore, materials with both a fully condensed silica matrix as well as a surface free of silanol groups are obtained. The materials are ideal precursors for further molecular silica surface modification, as demonstrated with a ferrocene derivative.

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Section: Introductionmentioning

confidence: 99%

High‐Temperature Chlorination‐Reduction Sequence for the Preparation of Silicon Hydride Modified Silica Surfaces

Plumeré¹,

Speiser²,

Mayer³

et al. 2009

Chemistry A European J

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“…Gold nanoparticles (MPC) protected by a monolayer of 1‐sulfanyloctane (MPC‐C8) were prepared by the procedure reported by Brust and co‐workers11 and optimized by Murray and co‐workers 12. They were subsequently subjected to site exchange13 with the azacrown‐functionalized thiol 1 to yield functional nanoparticles 2 (Scheme ) 14. Proton NMR spectroscopic analysis of the monolayer composition of 2 revealed a 1:1.2 ratio of 1‐sulfanyloctane and 1 , respectively.…”

Section: Methodsmentioning

confidence: 99%

Nanozymes: Gold‐Nanoparticle‐Based Transphosphorylation Catalysts

et al. 2004

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Besonders effektiv: Durch Selbstorganisation von Triazacyclonan‐funktionalisierten Thiolen auf der Oberfläche von nanometergroßen Goldpartikeln sind funktionalisierte Goldnanopartikel einfach zugänglich. Durch Komplexierung mit ZnII werden sie zu leistungsfähigen Katalysatoren für die Spaltung von Phosphatestern (siehe Schema). Wegen ihres RNase‐artigen Verhaltens werden sie Nanozyme genannt.

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“…Although Zn 2+ complexes have been the most investigated, due to their almost ubiquitous presence in metallo-enzymes deputed to cleave the phosphate ester bond, attempts to use different metals have been also performed [128][129][130][131]. A recent example is given by the silica NPs SiNP1-TACN -SiNP4-TACN ( Fig.…”

Section: Nanostructured Systemsmentioning

confidence: 99%

The design of TACN-based molecular systems for different supramolecular functions

Macedi

Bencini

Caltagirone

et al. 2020

Coordination Chemistry Reviews

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Silica-bound copper(ii) triazacyclononane: a robust material for the heterogeneous hydrolysis of a phosphodiester

Abstract: Copper(II) triazacyclononane, a catalyst for the hydrolysis of phosphate esters, has been covalently immobilized onto a silica surface and the resulting compound is a robust material that can effect heterogeneous phosphodiester hydrolysis.

Cited by 43 publications

References 11 publications

High‐Temperature Chlorination‐Reduction Sequence for the Preparation of Silicon Hydride Modified Silica Surfaces

High‐Temperature Chlorination‐Reduction Sequence for the Preparation of Silicon Hydride Modified Silica Surfaces

Nanozymes: Gold‐Nanoparticle‐Based Transphosphorylation Catalysts

The design of TACN-based molecular systems for different supramolecular functions

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