Photocatalytic Activity of Gold Nanocrystals and Its Role in Determining the Stability of Surface Thiol Monolayers

Li, J. Jack; Peng, Xiaogang

doi:10.1166/jnn.2004.003

Cited by 7 publications

(6 citation statements)

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“…Short linkers may provide an increased assay sensitivity [24] but may also lead to poor solubility. [22] Additionally, Li and Peng have shown that the photochemical stability of AuNPs is dependent on the length of the linker; [43] long alkanethiolate linkers provide improved stability over shorter linkers. In light of these considerations, we chose to work with OEG linkers consisting of thiol-terminated tetra(ethylene glycol).…”

Section: Wwwchemeurjorgmentioning

confidence: 99%

Chemoselective Capture of Glycans for Analysis on Gold Nanoparticles: Carbohydrate Oxime Tautomers Provide Functional Recognition by Proteins

Thygesen¹,

Sauer²,

Jensen³

2009

Chemistry A European J

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Nanoparticles functionalized with glycans are emerging as powerful solid-phase chemical tools for the study of protein-carbohydrate interactions using nanoscale properties for detection of binding events. Methods or reagents that enable the assembly of glyconanoparticles from unprotected glycans in two consecutive chemoselective steps with meaningful display of the glycan are highly desirable. Here, we describe a novel bifunctional reagent that 1) couples to glycans by oxime formation in solution, 2) aids in purification through a lipophilic trityl tag, and 3) after deprotection then couples to gold nanoparticles through a thiol. NMR studies revealed that these oximes exist as both the open-chain and N-glycosyl oxy-amine tautomers. Glycan-linker conjugates were coupled through displacement of ligands from preformed, citrate-stabilized gold nanoparticles. Recognition of these glycans by proteins was studied with a lectin, concanavalin A (ConA), in an aggregation assay and with a processing enzyme and glucoamylase (GA). We demonstrate that the presence of the N-glycosyl oxy-amines clearly enables functional recognition in sharp contrast to the corresponding reduced oxy-amines. This concept is then realized in a novel reagent, which should facilitate nanoglycobiology by enabling the operationally simple capture of glycans and their biologically meaningful display.

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Section: Wwwchemeurjorgmentioning

confidence: 99%

Chemoselective Capture of Glycans for Analysis on Gold Nanoparticles: Carbohydrate Oxime Tautomers Provide Functional Recognition by Proteins

Thygesen¹,

Sauer²,

Jensen³

2009

Chemistry A European J

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“…The synthesis and properties of metallic nanoparticles (NPs) has been extensively studied over decades, not only because of their unique properties, but also because of their potential applications in catalysis, electronics, optoelectronics, information storage, biosensors, and surface-enhanced Raman spectroscopy (SERS) [1][2][3][4][5][6][7][8][9][10]. Nanoparticles can exist as common structural elements or composites, and they have a wide functional diversity compared to bulk materials.…”

Section: Introductionmentioning

confidence: 99%

Bimetallic Nanoparticles: Enhanced Magnetic and Optical Properties for Emerging Biological Applications

et al. 2018

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Metal nanoparticles are extensively studied due to their unique chemical and physical properties, which differ from the properties of their respective bulk materials. Likewise, the properties of heterogeneous bimetallic structures are far more attractive than those of single-component nanoparticles. For example, the incorporation of a second metal into a nanoparticle structure influences and can potentially enhance the optical/plasmonic and magnetic properties of the material. This review focuses on the enhanced optical/plasmonic and magnetic properties offered by bimetallic nanoparticles and their corresponding impact on biological applications. In this review, we summarize the predominant structures of bimetallic nanoparticles, outline their synthesis methods, and highlight their use in biological applications, both diagnostic and therapeutic, which are dictated by their various optical/plasmonic and magnetic properties.

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“…Secondary interactions attributed to aurophilicity have been calculated to be 21-46 kJ/mol, which is on the order of the dissociation energy of a hydrogen bond. Larger clusters of Cu n , Ag n , and Au n (n ) 5-8) have been investigated through a variety of techniques and have been used as catalysts, [31][32][33][34][35][36][37] semiconductors, optical devices, pharmaceuticals, and antimicrobial agents. [38][39][40][41] Two-coordinate gold complexes are usually colorless; however, they can be luminescent depending on the ligand and the extent of metal-metal interaction.…”

Section: Introductionmentioning

confidence: 99%

Observation of a Mixed-Metal Transition in Heterobimetallic Au/Ag Dicyanide Systems

et al. 2007

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Crystals of the mixed-metal heterobimetallic Au/Ag dicyanide complex, K[AuxAg1-x(CN)2] (x = 0-->1), were obtained by slow evaporation. The mixed-metal complex K[Au0.44Ag0.56(CN)2] crystallizes in a rhombohedral crystal system, space group R. The crystal structure consists of layers of linear chains of Au(CN)2- and Ag(CN)2- ions and K+ ions that connect the layers through the N atoms. The excitation and emission spectra of single crystals of K[AuxAg1-x(CN)2] were recorded at 4.2-180 K using excitation wavelengths between 230 and 260 nm. Two emission bands due to Ag-Au interactions were observed at 343 and 372 nm. Lifetime measurements indicate the shorter-wavelength emission corresponds to fluorescence and the longer-wavelength band is phosphorescence. These new emission bands are not seen in the pure K[Ag(CN)2] or pure K[Au(CN)2] crystals. Extended Hückel calculations show that the LUMO of the mixed-metal system is bonding while the HOMO is antibonding or very weakly bonding. Moreover, excited-state extended Hückel calculations indicate the formation of exciplexes with shorter metal-metal distances and higher metal-metal overlap populations than the corresponding ground-state oligomers. The luminescence is assigned to a mixed-metal transition from a molecular orbital with Au character to a molecular orbital with Ag character.

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Photocatalytic Activity of Gold Nanocrystals and Its Role in Determining the Stability of Surface Thiol Monolayers

Cited by 7 publications

References 0 publications

Chemoselective Capture of Glycans for Analysis on Gold Nanoparticles: Carbohydrate Oxime Tautomers Provide Functional Recognition by Proteins

Chemoselective Capture of Glycans for Analysis on Gold Nanoparticles: Carbohydrate Oxime Tautomers Provide Functional Recognition by Proteins

Bimetallic Nanoparticles: Enhanced Magnetic and Optical Properties for Emerging Biological Applications

Observation of a Mixed-Metal Transition in Heterobimetallic Au/Ag Dicyanide Systems

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