Silver Films with Hierarchical Chirality

Ma, Liguo; Cao, Yuanyuan; Duan, Yingying; Han, Lu; Che, Shunai

doi:10.1002/anie.201701994

Cited by 30 publications

(20 citation statements)

References 43 publications

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“…[43] During the galvanic reduction of silver cations (Ag + ), chiral ligand (1R,2R)-(-)-Diaminocyclohexane (DAC) induces the hierarchical chirality of Ag films consisting of primary LH-twisted nanoflakes with distorted fcc (face centered cubic) crystal lattices, secondary nanoplates composed of RH-fanshaped stacks of the nanoflakes (with a 9.1° rotational stacking), and tertiary nanocircinates made of LH-arranged nanoplates (Figure 1L). [44] The nanoflakes possess the chirality opposite to that of the nanoplates, consistent with the hierarchical chirality of Au-thiolate twisted spikes (Figure 1M) mediated with Cys and surfactant cetyltrimethylammonium bromide (CTAB). [45] The Au twisted spikes are composed of staggered nanoflakes radially organized around a common center.…”

Section: Hierarchically Chiral Metalssupporting

confidence: 64%

“…The hierarchical chiral Ag films imprinted with (R/S)-DAC enable the enantiopreferential adsorption of d/l-alanine, and result in larger oxidation current of d/l-alanine (corresponding to the oxidation of the NH 2 group), respectively. [44] Similarly, the Au/ Ag alloyed nanotubes modified with l/d-Cye cause the enantiopreferentially galvanic oxidation of d/l-tyrosine (and threonine), respectively. [75] Furthermore, chirally imprinted mesoporous thin films (CIMTFs) were formed through the electrochemical reduction of precursor metallic salts on a chiral template (made of a lyotropic liquid crystal modified with chiral ligands) and subsequent removal of the chiral template, and thus the molecular chirality of chiral ligands was effectively transferred to the cavities at the mesoporous surfaces of the CIMTFs.…”

Section: Asymmetric Catalysismentioning

confidence: 99%

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Recent Advances in Inorganic Chiral Nanomaterials

et al. 2021

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handedness or LH) and d-sugars (only having right handedness or RH) with unknown reason. Such biological homochirality essentially governs asymmetric biochemical reactions with diverse physiological effects, and plays a paramount role in disease therapeutics and pharmaceutical production. [1] When bulk materials are shrunk to the nanometer scale, that is, the formation of nanomaterials or generally called nanoparticles (or NPs) that possess high surface areas and restrictly confine electron movement to remarkably induce a series of compelling chemical, catalytic, optical, plasmonic, (opto)electronic, magnetic, and mechanical properties. [2] Due to these unique properties, inorganic NPs have been developed to function as multifunctional platforms for biomedical applications (or bioapplications) in drug delivery, bioimaging, disease diagnosis, screening, and therapeutic treatments. [3] The homochirality-determined asymmetic biochemical activities and processes intrincially demand the fabrication of inorganic chiral nanomaterials, whose biofunctions fundamentally depend on the asymmetric interactions at nano-bio interfaces. [4] However, most inorganic compounds thermodynamically have achiral crystal structures, and metallic crystals usually have cubic or hexagonal symmetries. [5] Chiral driving forces are indispensably applied to impose chirality onto inorganic NPs, which have been reviewed previously. [6][7][8] Chiral driving forces include chirality transfer from chiral ligands, [9][10][11] chiral templates [12] (such as DNA, [13] proteins, [14] peptides, [15] cellulose nanocrystals, [16] liquid crystals modified with chiral ligands, [17] lipidic nanoribbons, [18] chiral mesoporous silica, [19] nanohelices [20,21] ), circularly polarized light (CPL), [22] spatially chiral arrangement using lithography techniques, [23] helical magnetic fields, [24] orbital angular momentum, [25] macroscopic asymmetric gradients of biaxial strain fields, [26] and macroscopic shear forces. [27,28] A pair of chiral objects are designated as enantiomorphs, and especially a pair of chiral molecules are called enantiomers. It is of fundamental importance to differentiate an enantiomorph from its stereoisomer (i.e., enantiodifferentiation or enantiodiscrimination), mainly through monitoring differential interactions with other chiral objects. The most compelling property of inorganic chiral NPs is optical activity (OA, or the chiroptical effect), denoting the differential interactions with LH and RH CPL (or LCP and RCP conventionally used). Chiral nanomaterials have the linear OA characterized with circular dichroism (CD, denoting the differential absorption) [29] Inorganic nanoparticles offer a multifunctional platform for biomedical applications in drug delivery, biosensing, bioimaging, disease diagnosis, screening, and therapies. Homochirality prevalently exists in biological systems composed of asymmetric biochemical activities and processes, so biomedical applications essentially favor the usage of inorganic chiral nanomaterials...

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Section: Hierarchically Chiral Metalssupporting

confidence: 64%

Section: Asymmetric Catalysismentioning

confidence: 99%

Recent Advances in Inorganic Chiral Nanomaterials

et al. 2021

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“…A similar approach was employed using nickel electrodes for the discriminatory electro-oxidation of the two phenylethanol enantiomers 265 or using silver electrodes for the electro-oxidation of amino acids. 266 Liu et al prepared Au/Ag alloyed nanotubes coated with cysteine which served as electrodes in an electrochemical cell. 267 Depending on the handedness of the cysteine coat, selective electro-oxidation of tyrosine enantiomers was observed.…”

Section: Chiral Catalysismentioning

confidence: 99%

Chiral plasmonic nanostructures: recent advances in their synthesis and applications

Pauly

2022

Mater. Adv.

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“…Chiral nanoassemblies, composed of individual NPs orderly arranged into superstructures, showed hierarchically collective conformations and special chiroptical properties. [35][36][37] The nanoassemblies with intrinsic chiral morphology did not just depend on whether the building blocks possessed chiral units. In this section, we mainly present two common methods for constructing chiral nanoscale assemblies.…”

Section: Chiral Nanoassembliesmentioning

confidence: 99%