Mechanistic insight into the Z-E isomerization catalysis of azobenzenes mediated by bare and core-shell gold nanoparticles
We explored the catalytic effect of 15 nm diameter gold nanoparticles (AuNPs) upon the thermal Z-E isomerization reaction of azobenzene and nine 4 and 4-4′ substituted azobenzenes (ABs). The kinetics follows a first order rate in ranges of [ABs] = 5 to 50 μM and [AuNPs] = 50 pM to 1 nM. A kinetic an...
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2015
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_20444753_v5_n4_p2110_Simoncelli http://hdl.handle.net/20.500.12110/paper_20444753_v5_n4_p2110_Simoncelli |
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paper:paper_20444753_v5_n4_p2110_Simoncelli2023-06-08T16:33:21Z Mechanistic insight into the Z-E isomerization catalysis of azobenzenes mediated by bare and core-shell gold nanoparticles Simoncelli, Sabrina Aramendía, Pedro Francisco Catalysis Diffusion Fiber optic sensors Gold Isomerization Isomers Kinetics Metal nanoparticles Nanoparticles Rate constants Silica Catalytic effects Compartmentalized systems Core-shell gold nanoparticles First-order rates Gold nanoparticle Isomerization reaction Kinetic analysis Silica core-shell nanoparticles Azobenzene We explored the catalytic effect of 15 nm diameter gold nanoparticles (AuNPs) upon the thermal Z-E isomerization reaction of azobenzene and nine 4 and 4-4′ substituted azobenzenes (ABs). The kinetics follows a first order rate in ranges of [ABs] = 5 to 50 μM and [AuNPs] = 50 pM to 1 nM. A kinetic analysis of this compartmentalized system renders the thermal Z-E isomerization rate constant associated with each AuNP. Enhancements of 10- to 106-fold were measured for this rate constant in comparison to the same free ABs in solution. Experiments with selective Au facet coverage, as well as the kinetics studied in gold-silica core-shell nanoparticles (AuNP@SiO2) of different thicknesses, demonstrate the surface nature of the catalysis and allow one to evaluate the diffusion coefficient of azobenzene in the silica layer. This journal is © The Royal Society of Chemistry 2015. Fil:Simoncelli, S. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Aramendía, P.F. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2015 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_20444753_v5_n4_p2110_Simoncelli http://hdl.handle.net/20.500.12110/paper_20444753_v5_n4_p2110_Simoncelli |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Catalysis Diffusion Fiber optic sensors Gold Isomerization Isomers Kinetics Metal nanoparticles Nanoparticles Rate constants Silica Catalytic effects Compartmentalized systems Core-shell gold nanoparticles First-order rates Gold nanoparticle Isomerization reaction Kinetic analysis Silica core-shell nanoparticles Azobenzene |
| spellingShingle |
Catalysis Diffusion Fiber optic sensors Gold Isomerization Isomers Kinetics Metal nanoparticles Nanoparticles Rate constants Silica Catalytic effects Compartmentalized systems Core-shell gold nanoparticles First-order rates Gold nanoparticle Isomerization reaction Kinetic analysis Silica core-shell nanoparticles Azobenzene Simoncelli, Sabrina Aramendía, Pedro Francisco Mechanistic insight into the Z-E isomerization catalysis of azobenzenes mediated by bare and core-shell gold nanoparticles |
| topic_facet |
Catalysis Diffusion Fiber optic sensors Gold Isomerization Isomers Kinetics Metal nanoparticles Nanoparticles Rate constants Silica Catalytic effects Compartmentalized systems Core-shell gold nanoparticles First-order rates Gold nanoparticle Isomerization reaction Kinetic analysis Silica core-shell nanoparticles Azobenzene |
| description |
We explored the catalytic effect of 15 nm diameter gold nanoparticles (AuNPs) upon the thermal Z-E isomerization reaction of azobenzene and nine 4 and 4-4′ substituted azobenzenes (ABs). The kinetics follows a first order rate in ranges of [ABs] = 5 to 50 μM and [AuNPs] = 50 pM to 1 nM. A kinetic analysis of this compartmentalized system renders the thermal Z-E isomerization rate constant associated with each AuNP. Enhancements of 10- to 106-fold were measured for this rate constant in comparison to the same free ABs in solution. Experiments with selective Au facet coverage, as well as the kinetics studied in gold-silica core-shell nanoparticles (AuNP@SiO2) of different thicknesses, demonstrate the surface nature of the catalysis and allow one to evaluate the diffusion coefficient of azobenzene in the silica layer. This journal is © The Royal Society of Chemistry 2015. |
| author |
Simoncelli, Sabrina Aramendía, Pedro Francisco |
| author_facet |
Simoncelli, Sabrina Aramendía, Pedro Francisco |
| author_sort |
Simoncelli, Sabrina |
| title |
Mechanistic insight into the Z-E isomerization catalysis of azobenzenes mediated by bare and core-shell gold nanoparticles |
| title_short |
Mechanistic insight into the Z-E isomerization catalysis of azobenzenes mediated by bare and core-shell gold nanoparticles |
| title_full |
Mechanistic insight into the Z-E isomerization catalysis of azobenzenes mediated by bare and core-shell gold nanoparticles |
| title_fullStr |
Mechanistic insight into the Z-E isomerization catalysis of azobenzenes mediated by bare and core-shell gold nanoparticles |
| title_full_unstemmed |
Mechanistic insight into the Z-E isomerization catalysis of azobenzenes mediated by bare and core-shell gold nanoparticles |
| title_sort |
mechanistic insight into the z-e isomerization catalysis of azobenzenes mediated by bare and core-shell gold nanoparticles |
| publishDate |
2015 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_20444753_v5_n4_p2110_Simoncelli http://hdl.handle.net/20.500.12110/paper_20444753_v5_n4_p2110_Simoncelli |
| work_keys_str_mv |
AT simoncellisabrina mechanisticinsightintothezeisomerizationcatalysisofazobenzenesmediatedbybareandcoreshellgoldnanoparticles AT aramendiapedrofrancisco mechanisticinsightintothezeisomerizationcatalysisofazobenzenesmediatedbybareandcoreshellgoldnanoparticles |
| _version_ |
1768544247258021888 |