Vibrational circular dichroism of N-acetyl-l-cysteine protected gold nanoparticles

Gautier, Cyrille; Bürgi, Thomas

doi:10.1039/b509346e

Cited by 72 publications

(84 citation statements)

References 21 publications

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“…Vibrational CD spectroscopy was recently applied for the first time to AuNPs of about 2 nm core diameter in order to study the conformation of adsorbed chiral cysteine derivatives. [18,[48][49][50][51][52] Figure 3 shows IR and VCD spectra of AuNPs covered by the two enantiomers of N-isobutyryl cysteine (NIC). Whereas the IR spectra are identical for the two enantiomers, the VCD spectra show a mirror-image relationship.…”

Section: Purification and Size Separationmentioning

confidence: 99%

Chiral Gold Nanoparticles

2009

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Monolayer-protected gold nanoparticles have many appealing physical and chemical properties such as quantum size effects, surface plasmon resonance, and catalytic activity. These hybrid organic-inorganic nanomaterials have promising potential applications as building blocks for nanotechnology, as catalysts, and as sensors. Recently, the chirality of these materials has attracted attention, and application to chiral technologies is an interesting perspective. This minireview deals with the preparation of chiral gold nanoparticles and their chiroptical properties. On the basis of the latter, together with predictions from quantum chemical calculations, we discuss different models that were put forward in the past to rationalize the observed optical activity in metal-based electronic transitions. We furthermore critically discuss these models in view of recent results on the structure determination of some gold clusters as well as ligand-exchange experiments examined by circular dichroism spectroscopy. It is also demonstrated that vibrational circular dichroism can be used to determine the structure of a chiral adsorbate and the way it interacts with the metal. Finally, possible applications of these new chiral materials are discussed.

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Section: Purification and Size Separationmentioning

confidence: 99%

Chiral Gold Nanoparticles

2009

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“…These results not only provided evidence for the existence of novel optically active nanomaterials, but also indicated that chiral effects are present in matter at the nanoscale. There have been published several additional reports confirming the observation of optically active nanoparticles using distinct chiral adsorbates as protecting ligands of Au, Ag, Pd nanoclusters, and semiconductor nanocrystals [5][6][7][8][9][10][11][12][13][14][15][16]. A chiral metallic cluster core model has been provided by recent measurements on the total structure determination of large and small gold-thiolate cluster compound [16][17][18][19].…”

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confidence: 90%

Optically active nanoparticles: Fullerenes, carbon nanotubes, and metal nanoparticles

Hidalgo

Noguez

2010

Physica Status Solidi (b)

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, Phone: þ52 55 5622 5106, Fax: þ52 55 5616 1535A brief topical review of the optical activity of fullerenes, carbon nanotubes, and metallic clusters, is given. Using a recently developed first-principles formalism, the particular case of the optical activity of the chiral C 84 fullerene with D 2 symmetry is studied in detail. In particular, the optical activity of the four possible isomers with this symmetry is studied by calculating the electronic circular dichroism (CD) and compared with experimental data. Although a similar line shape is found for the lowest-energy isomer, the width and intensity of the main experimental peaks are not well reproduced. On the other hand, it is found that the average CD of the mixture of the three lower-energy isomers is in better agreement with experiments. It is expected that this review would be useful as an introduction to optical activity at the nanometer scale, and motivate further experimental studies and the interpretation of natural optical activity in nanoparticles.Calculated CD of a mixture of different isomers of the fullerene C 84 with D 2 symmetry by using DFT and its comparison with experiment.

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“…To probe the chiral nature of these particles, chiroptical techniques such as circular dichroism (CD) and vibrational circular dichroism (VCD) are particularly helpful. Based on the comparison between the experimental and calculated VCD spectra, the preferential conformation of N-acetyl-cysteine 10 and N-isobutyryl-cysteine 11 absorbed on gold particles was proposed. Theses results were in good agreement with those obtained from measurements on a SAM of the thiol on extended gold surfaces.…”

Section: Introductionmentioning

confidence: 99%

Chiral 1,1′‐binaphthyl‐2,2′‐dithiol‐stabilized gold clusters: Size separation and optical activity in the UV–vis

et al. 2007

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Gold particles covered with 1,1'-binaphthyl-2,2'-dithiol (BINAS) were prepared. Using size exclusion chromatography, it was possible for the first time to separate the sample into fractions with different sizes and colors. Transmission electron microscopy shows that the particles are very small, in the order of 1 nm or slightly above. The absorption spectra of the separated samples show rich structure. The particles show size-dependent optical activity in metal-based electronic transitions. The shape of both the absorption and circular dichroism spectra of one of the smallest fractions exhibits similarities with the spectra reported for Au 11 covered by 2,2'-bis(diphenylphosphino)-1,1'-biphenyl although the spectra are shifted to shorter wavelengths in the case of the dithiol. The anisotropy factors, Delta epsilon/epsilon of these particles are as large as 4 x 10(-3), which is larger than the values reported for gold particles stabilized by phosphines and water-soluble thiols. This indicates that BINAS is particularly well-suited to impart chirality on to gold particles.

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Vibrational circular dichroism of N-acetyl-l-cysteine protected gold nanoparticles

Cited by 72 publications

References 21 publications

Chiral Gold Nanoparticles

Chiral Gold Nanoparticles

Optically active nanoparticles: Fullerenes, carbon nanotubes, and metal nanoparticles

Chiral 1,1′‐binaphthyl‐2,2′‐dithiol‐stabilized gold clusters: Size separation and optical activity in the UV–vis

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