Systematic Adjustment of Pitch and Particle Dimensions within a Family of Chiral Plasmonic Gold Nanoparticle Single Helices

Mokashi-Punekar, Soumitra; Merg, Andrea D.; Rosi, Nathaniel L.

doi:10.1021/jacs.7b07143

Cited by 67 publications

(89 citation statements)

References 49 publications

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“…In the crystal structure of Au 92 (SR) 44 , the sulfur bridges are found to lean to left or right against all the six diamond-tiling Au(100) facets, as indicated by arrows in Figure 3b. [136] In order to check if this chiral leaning of bridging ligands is exclusive to thiolate, we herein compare two Au 44 NCs of identical structure in which Au atoms are packed into a tetragonal box, i.e., Au 44 (SR) 28 , and Au 44 (Akn) 28 (SR = TBBT, and Akn = ethynylbenzene, PhCC). [138,139] We find that, on the Au(100) facets, leaning of bridging thiolates can be clearly identified in Au 44 (SR) 28 (Figure 3c, blue arrows), similar to the Au 92 (SR) 44 .…”

Section: Bridging Thiolatementioning

confidence: 99%

“…strong rotatory optical activity when the incident light interacts with chiral plasmonic nanostructures. [22][23][24][25][26][27][28][29] Localized surface plasmons can effectively enhance the electric and magnetic fields near the particle. Thus, chiral metal nanostructures can significantly enhance the chiroptical response and hold potential in asymmetric synthesis and catalysis, [30][31][32] and their selfassembly can be applied to negative-refractive-index materials, light-polarization filters, and ultrasensitive sensing devices.…”

Section: Introductionmentioning

confidence: 99%

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Chirality and Surface Bonding Correlation in Atomically Precise Metal Nanoclusters

et al. 2020

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In chemical science, chirality is indeed one of the most extensively studied phenomena. A chiral molecule possesses a pair of enantiomers and sometimes, only one of the enantiomers is effective as a functional unit or drug. [1,2] The mechanism on how the notorious enantiomers of thalidomide lead to teratogenic newborns has been revealed recently. [3] Chirality in coordination complexes has also been generalized in detail. [4] A classic example of molecules with point chirality is that it contains an asymmetric sp 3 carbon atom which is attached with four different atoms or groups. Such a molecule is not superimposable with its mirror image, and for a simple coordination complex, a metal atom-which is at the centerserves as the role of the chiral carbon (i.e., point chirality). As a result, the relative spatial arrangement of the substituents gives either a clockwise or an anticlockwise order, corresponding to the R and S enantiomers. Of note, the R/S notation of chirality has no fixed relation to the d/l notation (for sugars and amino acids). More generally speaking, chiral object is lack of S n symmetry elements; in other words, if a mirror plane (σ) and inversion (i) are both missing in the object, then it becomes chiral. From this definition, irregular objects are all chiral. Objects of C n (with n-fold axis) or D n (with C 2 axis perpendicular to the n-fold axis) symmetry are much more appealing as long-range order is created. Along with organic chiral molecules, [2] chiral complexes, [4] and chiral supramolecular systems with autonomous self-assembly generated by intermolecular noncovalent interactions have been discussed thoroughly in previous reviews. [5-9] Chiral inorganic nanostructures, with intermediate sizes between molecules of Å and objects of micrometers, are of critical significance owing to their tremendous applications in chiral catalysis, chiroptical metamaterials, enantioseparation, biomolecular and enantiomer sensing, as well as medicine. [10-12] For chiral semiconductor nanoparticles (NPs), commonly called quantum dots (QDs), such as cadmium chalcogenides, the chiral surface ligands are attached onto the QDs through covalent bonds, [13-17] and many applications can be designed. [18] The interactions of chiral moieties attached on graphene NPs lead to their helical assembly, enriching the optical and electronic properties of these chiral nanostructures and facilitating their applications. [19-21] The studies on chiral metal NPs greatly overwhelm those on the semiconductor counterparts. Metal NPs are known to have Chirality is ubiquitous in nature and occurs at all length scales. The development of applications for chiral nanostructures is rising rapidly. With the recent achievements of atomically precise nanochemistry, total structures of ligand-protected Au and other metal nanoclusters (NCs) are successfully obtained, and the origins of chirality are discovered to be associated with different parts of the cluster, including the surface ligands (e.g., swirl patterns), the organic-inorganic in...

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Section: Bridging Thiolatementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Chirality and Surface Bonding Correlation in Atomically Precise Metal Nanoclusters

et al. 2020

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“…DNA nanotechnology has developed extensively in recent years, and now provides a better choice of chiral NP assemblies. DNA has been used for several types of chiral NP assemblies, the typical geometries of which are NP dimers, pyramids, and helices . For example, DNA origami has been used to fabricate chiral pyramid structures (Figure B), which consist of four different micron particles (three differently sized polystyrene particles and one polymethyl methacrylate particle).…”

Section: The Chiroptical Effects For Different Nanostructuresmentioning

confidence: 99%

Chirality‐Based Biosensors

Wang

et al. 2018

Adv Funct Materials

124

120

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The fabrication of chiral nanostructures gives rise to characteristic chiroptical activity, which can be used for chirality-based biosensors. Great progress is made in the use of nanoassemblies for the construction of chiral nanoparticle dimers, pyramids, helices, and twisted structures, and their chiroptical activities correlate with diverse structural geometries and enantiomeric configurations. In DNA-hybridization-based chiral nanoassemblies, the assembly parameters, such as the components, gaps, multicomponents, and the aftergrowth of metal, can result in multiple bands and enhanced chiroptical effects. Based on known chiral nanostructures, the existing chiral nanoassembly-based biosensors together with their targets and signal amplification strategies are reviewed. Chirality involves multiple signals, and multitarget biosensors are introduced with newly developed chiral architectures for the accurate and reliable monitoring of biomarkers in living cells. The interactions between chiral nanoarchitectures and biosystems are also highlighted, which are important not only in the chiral dynamic switching of nano-objects for biomonitoring, but also in manipulating cell growth, proliferation, and adhesion. The future perspectives on chiral fabrication and its use in biosensors are also comprehensively discussed. and future perspectives in chiral fabrication to enhance the chiroptical properties for emerging biosensors application.

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“…24,25 In general, such approaches entail processing under ambient conditions in aqueous solutions at room temperature and pressure. Such biomimetic approaches have been exploited to generate materials for specic applications including catalysis, 26,27 nanomedicine, 28 plasmonics, 29,30 etc. While bio-inspired methods have been applied to produce ZnS 31,32 and CdS, 32,33 few biomimetic methods have been used in the synthesis of CuS.…”

Section: Introductionmentioning

confidence: 99%