Enantiomeric Discrimination by Surface‐Enhanced Raman Scattering–Chiral Anisotropy of Chiral Nanostructured Gold Films

Liu, Zexi; Ai, Jing; Kumar, Prashant; You, En‐Ming; Zhou, Xiong; Liu, Xi; Zhang, Tian; Bouř, Petr; Duan, Yingying; Han, Lu; Kotov, Nicholas A.; Ding, Song‐Yuan; Che, Shunai

doi:10.1002/anie.202006486

Cited by 75 publications

(75 citation statements)

References 25 publications

(2 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Also “chirality transfer” phenomena when chiral molecules make non‐chiral ones optically active attracted attention because of multiple aspects [7] . The chirality induction provides a detailed insight into molecular interactions [8] and is thus interesting for nanotechnology industry [9] and analytical chemistry [10] . For ROA, the effect can be surprisingly strong, [7a,d] which would potentially broaden application field of the technique, often hampered by low sensitivity and instrumental artifacts [11]…”

Section: Figurementioning

confidence: 99%

Two Spectroscopies in One: Interference of Circular Dichroism and Raman Optical Activity

Kapitán

et al. 2020

Angew Chem Int Ed

Self Cite

View full text Add to dashboard Cite

Previously, we and other laboratories have reported an unusual and strong Raman optical activity (ROA) induced in solvents by chiral dyes. Various theories of the phenomenon appeared, but they were not capable of explaining fully the observed ROA band signs and intensities. In this work, an analysis based both on the light scattering theory and dedicated experiments provides a more complete understanding. For example, double‐cell magnetic circular dichroism and magnetic ROA experiments with copper‐porphyrin complex show that the induced chirality is observed without any contact of the solvents with the complex. The results thus indicate that a combination of electronic circular dichroism (ECD) with the polarized Raman scattering is responsible for the effect. The degree of circularity of solvent vibrational bands is a principal molecular property participating in the event. The insight and the possibility to predict the chirality transfer promise future applications in spectroscopy, chemical analysis and polarized imaging.

show abstract

Section: Figurementioning

confidence: 99%

Two Spectroscopies in One: Interference of Circular Dichroism and Raman Optical Activity

Kapitán

et al. 2020

Angew Chem Int Ed

Self Cite

View full text Add to dashboard Cite

show abstract

“…Instrumental analysis has high requirements for equipment and high price 3 . Surface‐enhanced Raman scattering is subjective to the substrates 4 . Fluorescence analysis is very sensitive to intrusion originating from other unrelated molecules, thus causing the variation in fluorescence intensity 5 .…”

Section: Introductionmentioning

confidence: 99%

Chiral voltammetric sensor for tryptophan enantiomers by using a self‐assembled multiwalled carbon nanotubes/polyaniline/sodium alginate composite

Niu

Xing

et al. 2021

Chirality

View full text Add to dashboard Cite

Due to the crucial role of amino acids in life sciences and pharmaceutics, identification of optical amino acid molecules is of great significance. In this study, the two materials (CNT and PANI) were combined together to obtain the magnification of electrochemical signal by substrate material (CNT/PANI). Then a self‐assembled multiwalled carbon nanotubes/polyaniline/sodium alginate (CNT/PANI/SA) nanocomposite with chiral sites and conductive material was synthesized as the electrochemical sensing interface. Next, a novel electrochemical sensing interface was fabricated via modifying the as‐prepared chiral material on a polished glassy carbon electrode (CNT/PANI/SA/GCE) for precisely, efficiently, and rapidly differentiation of tryptophan (Trp) enantiomers. It was observed that CNT/PANI/SA/GCE showed desirable stereoselective recognition effect in the variety of signal strength to peak current (Ip) to the different optical activity of Trp enantiomers. In the case of optimal conditions, the peak current ratio in the solution of l‐Trp and d‐Trp (ID/IL) was observed to be 2.1 at CNT/PANI/SA/GCE by differential pulse voltammogram (DPV). UV–visible spectroscopy further showed that CNT/PANI/SA had a greater binding energy to l‐Trp. Also different factors affecting the enantioselectivity of CNT/PANI/SA/GCE, such as the incubation time, pH, and dropcoating volume of CNT/PANI/SA were optimized. Moreover, the proposed CNT/PANI/SA/GCE showed excellent specific stereoselectivity and anti‐interference ability. Besides, the proposed chiral sensing platform can be effectively applied in real samples to detect Trp enantiomers sensitively. This work inspires us a new path for the preparation of substrate material with excellent electrical conductivity, as well as extend its application potential in chiral recognition.

show abstract

“…For example, chiral nematic TiO 2 [6] and SiO 2 [7] films synthesized by cellulose liquid crystal templates, and chiral inorganic photonic crystal films with layer‐by‐layer Langmuir‐Schaefer assembly of achiral inorganic NiMoO 4 nanowires, [8] which displayed different colours under left‐ and right‐handed circularly polarized light filters (L‐ and R‐CPFs). Recently, we synthesized various chiral inorganic films, [4f,i, 9] such as SiO 2 , ZnO, CuO, TiO 2 , NiO, Ag, Au, and SnO 2 films, with multilevel chiral structures and adjustable OAs using chemical growth methods. Regrettably, none of these films exhibits the circularly polarized colour response due to their relatively weak OAs and narrow optical response band.…”

Section: Figurementioning

confidence: 99%

Chiral Mesostructured BiOBr Films with Circularly Polarized Colour Response

Ding

Deng

et al. 2021

Angewandte Chemie

Self Cite

View full text Add to dashboard Cite

Achieving strong and broadband circularly polarized colour responses in chiral inorganic materials is challenging. Here, we fabricated chiral mesostructured bismuth oxybromide (BiOBr) films (CMBFs) via hydrothermal growth using chiral sugar alcohols as symmetry‐breaking agents. The layered slabs of BiOBr crystals with weak van‐der‐Waals interactions are prone to mismatching due to the chiral driving force, resulting in hierarchically chiral arrangements of fine size. Three levels of chirality exist in the CMBFs: primary, helical distortion crystal lattices of a nanoflake, secondary, helical stacking of nanoflakes to form nanoplates, and tertiary, chiral vortexes arranged by nanoplates. The CMBFs displayed optical activities (OAs) over a wide wavelength range of 350–2500 nm with an anisotropic factor of up to 0.99, which led to a significant chirality‐dependent colour response to circularly polarized light. The high selectivity can be considered as the result of enhanced resonance due to structural‐handedness matching and the synergistic effect of multiple OAs.

show abstract

Enantiomeric Discrimination by Surface‐Enhanced Raman Scattering–Chiral Anisotropy of Chiral Nanostructured Gold Films

Cited by 75 publications

References 25 publications

Two Spectroscopies in One: Interference of Circular Dichroism and Raman Optical Activity

Two Spectroscopies in One: Interference of Circular Dichroism and Raman Optical Activity

Chiral voltammetric sensor for tryptophan enantiomers by using a self‐assembled multiwalled carbon nanotubes/polyaniline/sodium alginate composite

Chiral Mesostructured BiOBr Films with Circularly Polarized Colour Response

Contact Info

Product

Resources

About