Journal of Materials Chemistry C
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2020
·Vol. 9
·期 2
·555-561
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IF 7.059
Xiao Shao,Yue Wu,Shuang Jiang,Bin Li,Tianyong Zhang,Yong Yan
The chirality of inorganic semiconductor nanocrystals (NCs) was demonstrated to be sensitive to the particle structures and chiral molecules capped on the NC surfaces. In this work, we found the native achiral ligands used for the synthesis of NCs could also influence their circular dichroism (CD) response. With different native ‘growth’ ligands but similar semiconductor cores, the CD spectra of NCs exhibited mirror images by using the same enantiopure cysteine (Cys) ligands, indicating the inversion of NC chirality. In addition, distinct anisotropic dissymmetry factors (g-factor) were observed. With appropriate native ligands, we prepared chiral cysteine stabilized spherical CdSe NCs (quantum dots, QDs) with the highest g-factor ever reported.
研究领域:
材料科学
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化学
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DOI
高影响因子
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
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2017
·Vol. 55
·期 13
·2227-2233
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IF 2.952
Zhi-Peng Yu,Na Liu,Ya-Lan Lin,Jian Huang,Hui-Qing Wang,Zong-Quan Wu
A cholesteryloxyallene (1) bearing chiral cholesteryl pendant group was designed and synthesized. Living polymerization of this monomer with an allylnickel complex as a catalyst give poly(cholesteryloxyallene)s (poly- 1 m s) in high yields with controllable molecular weights and narrow molecular weight distributions. These polymers were found to possess a dynamic helical conformation with a preferred handedness in n -hexane as confirmed by circular dichroism and absorption spectra as well as optical ratios. The helical conformation of the polymers was revealed to stabilize as the number of repeat units increased until the degree of polymerization reached 100. The helical conformation of poly- 1 100 could be controlled by altering the temperature of solutions. © 2017 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2017 , 55 , 2227–2233
研究领域:
高分子化学
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材料科学
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DOI
高影响因子
CHIRALITY
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2017
·
IF 1.956
Yin Zhao,Lu Yin,Jingjing Liu,Hailing Chen,Wei Zhang
Conjugated homopolymer poly(9,9-bis(3-(( S )-2-methylbutylpropanoate))fluorene) (PSF) with chiral pendants was synthesized and characterized. Dissolution experiments show that PSF is well dissolved in racemic limonene at high temperature and begins aggregating upon sequential cooling treatment. The corresponding assemblies were transferred to quartz plate by the spin-coating method. Comparably, film casting from chloroform solution was also prepared. Upon annealing thermal treatments, these PSF films exhibited perfect mirror circular dichroism (CD) Cotton effects and dissymmetry ratios. Optical absorption spectroscopy (UV-vis), CD, and fluorescence spectroscopy results reveal that chiral side chains successfully induced M - and P -helical structures in aggregates and films, and this significant difference was ascribed to their differential supramolecular conformations.
研究领域:
高分子化学
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材料科学
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PubMed
高影响因子
INORGANIC CHEMISTRY
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2020
·
IF 4.825
Xiao Shao,Yue Wu,Shuang Jiang,Bin Li,Tianyong Zhang,Yong Yan
Three-dimensional (3D) nanomaterials have been intensively investigated because of their unique properties and wide range of potential applications; however, the ligand-induced chirality in 3D semiconductor nanocrystals has been scarcely studied. In this paper, we report the synthesis of hydrophobic 3D CdSe nanotetrapods (Tps) with a high degree of uniformity in their morphology by using the hot-injection method. The core and arms of Tps are distinct in their crystal structure, thus creating an intracrystal heterojunction. The size of Tps, primarily the length of four arms, is controlled by changing the amount of didecyldimethylammonium bromide and reaction time. Next, enantiopure cysteine ligands were introduced to replace the hydrophobic native stabilizers to prepare chiral l- and d-cysteine-capped CdSe Tps. Importantly, the circular dichroism (CD) line shapes of l/d-cysteine-capped CdSe Tps are assigned to the different excitonic transitions of the core and arms, respectively. In addition, the observed CD activities are found to be sensitive to the size of the CdSe Tps, where the anisotropic g factors have increased and reached the maximum value at a moderate aspect ratio (AR) and a further increase of the AR leads to a decrease of the g factor. Because of charge transfer between the core and arms, we propose a plausible mechanism potentially responsible for the induced CD line shapes in terms of the excitonic states of Tps with two different crystal structures. We believe that chiral 3D nanomaterials with anisotropic morphologies could offer new opportunities for relevant applications.
研究领域:
材料科学
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光学
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纳米技术
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PubMed
高影响因子
JOURNAL OF BIOCHEMICAL AND MOLECULAR TOXICOLOGY
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2012
·Vol. 26
·期 12
·487-492
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IF 1.38
Jiongwei Pan,Zaiting Ye,Xiaoping Cai,Liangxing Wang,Zhuo Cao
The interaction of ceftriaxone sodium (CS), a cephalosporin antibiotic, with the major transport protein, bovine serum albumin (BSA), was investigated using different spectroscopic techniques such as fluorescence, circular dichroism (CD), and UV–vis spectroscopy. Values of binding parameters for BSA–CS interaction in terms of binding constant and number of binding sides were found to be 9.00 × 10 3 , 3.24 × 10 3 , and 2.30 × 10 3 M −1 at 281, 301, and 321 K, respectively. Thermodynamic analysis of the binding data obtained at different temperatures showed that the binding process was spontaneous and was primarily mediated by van der Waals force or hydrogen bonding. CS binding to BSA caused secondary structural alterations in the protein as revealed by CD results. The distance between CS and Trp of BSA was determined as 3.23 nm according to the Förster resonance energy transfer theory. © 2012 Wiley Periodicals, Inc. J Biochem Mol Toxicol 26:487-492, 2012; View this article online at wileyonlinelibrary.com . DOI 10.1002/jbt.21446
研究领域:
生物化学
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分子毒理学
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药物相互作用
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PubMed
高影响因子
Journal of Physical Chemistry C
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2021
·
IF 4.126
Yiran Xia,Hongdong Duan,Aiyou Hao,Pengyao Xing
Dynamic control of supramolecular chirality and chiroptical properties is a challenging task and has great significance in the preparation of responsive and intelligent functional materials. Here, we report the dynamic evolution of supramolecular chirality and the corresponding chiroptical properties via multicomponent coassembly driven by intermolecular hydrogen bonds. Stilbene conjugated with amino acids can self-assemble into chiral nanostructures with chiroptical activities including circular dichroism and circularly polarized luminescence (CPL). After coassembly with melamine (Mm), a macroscopic nanohelix was observed in assemblies. This evolution process is accompanied by variations in Cotton effects and CPL properties depending on the amino acid domains. The photoresponsiveness of the isomerization reaction was successfully achieved due to the existence of the stilbene structure, where the fluorescence changes can be applied to fluorescent carving. This work illustrates the dynamic chirality evolution and response, providing a simple method for the design and manufacture of smart chiroptical materials.
研究领域:
材料科学
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化学
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DOI
高影响因子
CHEMISTRY OF MATERIALS
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2023
·
IF 8.6
Wenli Wei,Wenhe Wang,Fengxia Wu,Yu Tian,Guobao Xu,Wenxin Niu
Plasmonic-coupled circular dichroism (PCCD) represents a versatile method to synthesize chiroplasmonic nanoparticles (NPs), which play irreplaceable roles in various fields such as enantioselective sensing, spectroscopies, and chiral catalysis. Nonetheless, two critical challenges are faced in the development of PCCD-based chiroplasmonic NPs: low chiral amplification and poor stability. To circumvent these restrictions, we herein performed a quantitative study of the enhancement and stability of PCCD by the embedment of chiral molecules in discrete Ag NPs. Our study reveals that the high chiral amplification is attributed to the chiral molecules embedded in NPs, rather than those adsorbed on the surface. The embedment of chiral molecules significantly increases the coupling between chiral molecules and Ag NPs, and thus, a record-high chiral amplification of over 4800 times is achieved. Moreover, the CD signals of the Cys-embedded Ag NPs are almost unchanged after 3 months of storage, also benefiting from the embedment strategy. These results will open up new possibilities for designing new PCCD systems with high chiral amplification and superior stability and lay the groundwork for the applications of PCCD-based chiral NPs.
研究领域:
材料科学
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光学
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化学
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高影响因子
Nanoscale
·
2013
·Vol. 5
·期 16
·7589-7595
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IF 6.233
Tiantian Cao,Shenshen Jin,Shuxin Wang,Dandan Zhang,Xiangming Meng,Manzhou Zhu
A 25-atom gold nanocluster capped with an achiral thiolate exhibits no chiroptical signals in circular dichroism (CD) measurements. Herein, we report a systematic study on the effects of the chiral environment on the CD response from the Au25 metal core. We found that Au25(SC2H4Ph)18−TOA+ dissolved in a chiral solvent did not give rise to a CD response, nor did Au25(SC2H4Ph)18− when associated with a chiral counterion (e.g., (−)-N-dodecyl-N-methylephedrinium, DME+). Both scenarios imply that the interaction of the chiral counterion (or chiral solvent molecules) with the achiral Au25(SC2H4Ph)18− nanocluster is not strong enough to induce CD signals from the metal core. In contrast, when the metal core is capped with chiral ligands (i.e., Au25(SCH2C*H(NH2)CH2Ph)18), strong CD signals in the visible wavelength range were observed. Thus, the induction of CD signals by surface chiral ligands is much stronger than that by the external chiral environment (including the chiral solvent or counterion). This work reveals some further insight into the origin of the chiroptical response of the Au nanoclusters. These chiral nanoclusters hold potential for practical applications in bioconjugation, sensing, and chiral catalysis.
研究领域:
材料科学
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光学
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化学
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PubMed
高影响因子
OPTICS LETTERS
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2023
·Vol. 48
·期 2
·440-443
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IF 3.6
Jiayue Liu,Tianrui Zhang,Zhiyu Tan,Jierong Cheng,Shengjiang Chang,Shengjiang Chang,Fei Fan,Fei Fan
The highly sensitive detection and identification of chiral biochemical substances have attracted extensive attention. Terahertz (THz) spectroscopy and sensing technology have obvious advantages in non-contact and label-free biochemical detection, but the THz chiral spectral response of chiral biochemical substances is too weak to realize highly sensitive chiral enantiomer recognition. Herein, we propose a method of spin beam deflection and separation by using a Pancharatnam–Berry (PB) metasurface to enhance the THz chirality response of chiral amino acids, realizing the identification of chiral enantiomers of the same kind of amino acid. The conjugate spin transmittances and circular dichroism (CD) spectra of d- and l-tyrosine samples on the PB metasurface were measured by an angle-resolved THz time-domain polarization spectroscopy system, and their CD values reached 16.4° and −11.6° at a deflection angle of ±33°, respectively, which were enhanced by about 9.3 and 11.9 times compared with the maximum CD values of the sample without the metasurface. Therefore, this THz chiral sensing method based on a PB metasurface has great potential in highly sensitive chirality identification and enhancement for chiral substances.
研究领域:
生物化学
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光学
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材料科学
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PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2022
·Vol. 32
·期 44
·2201927
·
IF 19.924
Sixiang Zhao,Han Zhu,Jicun Lu,Ming Li,Liancheng Zhao,Lei Zhou,Liming Gao
Chirality generated by the co-assembly of plasmonic nanoparticles (NPs) and chiral photonic crystals has attracted broad interest owing to its strong optical activities. However, it is difficult to understand the physical mechanism of the unique chiral responses, for surface-plasmon-mediated circular dichroism (SP-CD) is a hybrid response generated from chiral plasmonic–photonic systems. This study aims to investigate how chirality is generated by this system and the relationship between SP-CD and plasmonic–photonic couplings. Here, quasi-continuous plasmon bands are designed to interact with the different photonic bandgaps of cellulose nanocrystals (CNCs). In spectroscopy and simulation, characteristic SP-CD shape lines derived from the extinction dispersion of plasmonic NPs for circularly polarized light in the CNCs are observed. It is demonstrated that this plasmonic chirality is determined by the coupling states and originates from a multiple scattering combination of plasmonic NPs under a chiral excitation field. A novel transfer-matrix method is established to perform numerical analysis of this complex multiple scattering efficiently. This study is expected to offer a deep insight into chiral plasmonic–photonic systems.
研究领域:
光学
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材料科学
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纳米技术
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高影响因子
CRYSTAL GROWTH & DESIGN
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2022
·
IF 4.01
Li Yao,Kan-Hao Xue,Haoyu Tong,Chao Chen,Guangda Niu,Wenlong Yang,Jiang Tang
Chiral organic–inorganic hybrid metal halides have a strong structure–property relationship, such as that the modification of their structural dimensionality can adjust their chiroptical properties. Here, based on chiral organic molecules R/S-methylbenzylamine (R/S-MBA), we synthesized new chiral antimony halides with structures from zero-dimensional (0D) (R/S-MBA)2SbI5to one-dimensional (1D) (R/S-MBA)SbI4. The chirality transfer from chiral ligands to the inorganic framework was analyzed based on the electrical dipole moment of R/S-MBA. The anisotropy factor of circular dichroism (gCD) of this 1D chiral (R/S-MBA)SbI4 is determined to be about ∼0.02, which is about 1 order of magnitude larger than that of the 0D (R/S-MBA)2SbI5.
研究领域:
材料科学
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光学
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化学
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DOI
高影响因子
CARBOHYDRATE POLYMERS
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2021
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IF 9.381
Huijuan Jing,Xin Huang,Xiaojing Du,Ling Mo,Chaoyang Ma,Hongxin Wang
In this work, a novel synthesis strategy of sodium alginate/carboxymethyl chitosan hydrogel beads promoted by hydrogen bond was described. The beads were prepared by dropping the blends of two polymers into the citric acid solution. Besides hydrogen bonding , electrostatic interactions were also involved in the formation of the hydrogel beads. The thermal stability experiments revealed that the more the content of carboxymethyl chitosan , the better the thermal stability of the beads. The beads exhibited excellent pH sensitivity, pH reversibility, and lactoferrin loading capacity. The swelling ratio of the bead and its protein releasing profile was pH-dependent, which could prevent premature protein release in the gastric environment. Also, the circular dichroism results demonstrated that lactoferrin could maintain its structure during the loading and releasing process. The obtained results revealed that the hydrogel beads prepared in this work could be used as a potential protein carrier for oral delivery.
研究领域:
生物材料学
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药物递送系统
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PubMed
高影响因子
危险品化学品经营许可证（带存储）