JOURNAL OF MATERIALS CHEMISTRY
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2012
·Vol. 22
·期 43
·23169-23174
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IF 5.968
Xianguang Ding,Yu Zou,Jiang Jiang
The synthesis of hybrid nanostructures has been of great interest to many material scientists, yet simple and facile routes to prepare these structures remain a difficult task with many reaction variables to tune. Herein, we report the synthesis of Au–Cu2S heterodimers from AuCu alloy nanoparticles by simply adding 1-dodecanethiol. Detailed characterization of this structural transformation process revealed that the crucial step of this synthetic approach was the alloy oxidization and subsequent formation of intermediate copper thiolate. Roles of surfactants and sulfur source have also been investigated. These observations provide critical insight into the understanding of the pathways of structure transitions from AuCu alloy to Au–Cu2S heterodimer nanoparticles, and will open up new ways of synthesizing heterodimer nanoparticles from metallic alloys.
研究领域:
材料科学
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纳米技术
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DOI
高影响因子
JOURNAL OF ORGANIC CHEMISTRY
·
2023
·
IF 3.6
Wen Li,Hexiang Wang,Yuan Zhang,Limin Zhao,Pengfeng Guo,Hua Cao,Xiang Liu
Pyridinium 1,4-zwitterionic thiolates were regarded as powerful and versatile building blocks to prepare nitrogen- and sulfur-containing heterocycles. Herein, we reported a copper-catalyzed formal [4 + 1] annulation of pyridinium 1,4-zwitterionic thiolates and diazo compounds without any additives to access a library of trifunctionalized indolizines in good yields. Besides, isoquinolinium 1,4-zwitterionic thiolates and imidazolium 1,4-zwitterionic thiolates were also applied to this formal [4 + 1] annulation reaction. Of particular note is that various functional groups such as −CO2R, −CO2NR2, −CF3, −CN, and −(O)P(OR)2 could be easily introduced into cycloaddition products indolizines by this strategy.
研究领域:
有机化学
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合成化学
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DOI
PubMed
高影响因子
ChemNanoMat
·
2020
·Vol. 7
·期 3
·270-276
·
IF 3.384
Shengrui Zhang,Yang Yu,Shujue Xu,Jun Liu,Mo Liu,He Su,Yajiao Hao,Minjie Li,Sean Xiao-An Zhang
Graphical Au(I)-thiolate nanosheets have been studied as new and efficient water-dispersible UV absorbents. UV screening is very important for the prevention of skin cancer and the elongation of the lifetime of organic/polymeric stuff. To overcome the main problems of poor hydrophilicity and easy leakage of organic UV absorbents, water-dispersible Au(I)-thiolate nanosheets have been studied as a new type of UV absorbents. The results show that Au(I)-thiolate nanosheets have i) very high molar absorption coefficients (>15000 mol/L . cm), ii) comparable or superior photostability to typical organic UV absorbents, and iii) high transparency and nearly no leakage in polymer matrix. So far, no other UV absorbents have been reported to have all the above good performances simultaneously. The transparent and colorless Au(I)-thiolate/polymer thin films can effectively block UV light, and such a material will surely extend the types and the application scenarios of UV absorbents.
研究领域:
材料科学
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化学
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医学
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DOI
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2022
·Vol. 28
·期 67
·e202201968
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IF 5.02
Shujue Xu,Shen Zhang,Yang Yu,Shengrui Zhang,Minjie Li
Graphical Au(I)-thiolate nanosheets with closely-packed multiple surface functional groups have been synthesized via a one-pot co-assembly strategy. The easy but powerful strategy addresses the surface engineering problem for 2D materials and paves the way for their wider applications in sensing and biomaterials. Two-dimensional (2D) Au(I)-thiolate assemblies are a special type of material that can balance high structural stability and rich surface functionality, which shows promising prospects in both fundamental research and applications. Co-assembly of multiple ligands is a facile way to further enrich the surface properties and functions, and expand their application potentials. In this work, taking 3-mercaptopropionic acid (MPA), cysteine (Cys) and 1-thioglycerol (TGO) as example ligands, we studied in detail the possibility to co-assemble them into one nanosheet. Although the three ligands have significantly different controllability and pathways when self-assembling individually with Au(I), they can still be effectively co-assembled by reacting with HAuCl 4 together to obtain three-ligand nanosheets with good colloidal stability. The key points for successful co-assembly are also revealed by comparing single- and three-ligand self-assembly processes, laying a solid foundation for co-assembly of even more ligands. The easy but powerful strategy for 2D materials with closely-packed and multiple tunable surface functional groups addresses the surface engineering problem for 2D materials and paves the way for their wider applications in sensing and biomaterials.
研究领域:
材料科学
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化学
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生物医学工程
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产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Ning Liu,Yusen Wang,Zhiping Song,Weiqiang Yang,Jiancong Ni,Xiaoping Chen,Zhenyu Lin
Understanding the charge transfer and dielectric properties of organic monolayers in electrochemical systems is still challenging because these two properties are intertwined by variables including monolayer structure, electrolyte type, and concentration. The tunneling decay coefficient (β) reflects the evolution of molecular resistance vs length in a circuit. In this work, we applied electrochemical impedance spectroscopy (EIS) to characterize self-assembled monolayers (SAMs) of S(CH2)n−1CH3 (nC = 4, 6, 8, 10, and 12) on Au electrodes in both redox Fe(CN)63-/4– and nonredox NaClO4 electrolytes. We found that decreasing the concentration of Fe(CN)63-/4– (CFe) from 100 to 1.0 mM led to increases in solution resistance (RS) from ∼3.3 to 17.0 Ω·cm2, log-resistance of SAM from 1.62 to 5.04 Ω·cm2 for nC = 12, and a 63% increase in β from 0.51 to 0.83 nC–1; the dielectric constant of the SAM (εr) decreased with nC while remaining almost constant at different CFe. EIS in the nonredox NaClO4 electrolyte showed a low β value of 0.62 nC–1. Low CFe of 1.0–10 mM was optimal for precise electrochemical characterizations of short and compact SAMs with a 2.5 Å variation in molecular thickness. Our study contributes to a better understanding of how the electrolyte and monolayer-modified barrier affect the charge transfer across SAM–electrode interfaces and the dielectric response of SAM, in electrochemical and biological sensing applications.
研究领域:
物理化学
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电化学
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表面科学
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生物传感器
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分子电子学
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产品关联
DOI
PubMed
高影响因子
INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Nan Yu,Yingqiu Zhu,Tingting Wang,Ruihan Lin,Longhua Li,Guowei Yang,Xianglong Liu,Jianghua Li,Junli Wang
Currently, there is not much success in solving the molecular and crystal structures of long-chain metal alkanethiolate complexes [M(SCnH2n+1)m] at the atomic level. Taking Sb(SC16H33)3 (1) as an example, we herein disclose the structural characteristics of long-chain trivalent antimony(III) alkanethiolates Sb(SCnH2n+1)3 (n ≥ 12) by single-crystal X-ray crystallography. Specifically, the Sb atom is three-coordinated by alkanethiolate ligands and a slightly distorted triangular pyramid SbS3 core is formed owing to the unique intramolecular stereochemistry of three alkyl chains, namely, two of them almost parallel aligning and the third chain extending alone around the SbS3 core. We further determine the conformation, spatial orientation and packing density of alkyl chains in 1 along with a comparison to those in other long-chain crystalline systems, and reveal the roles of intermolecular van der Waals and Sb···S secondary interactions in molecular self-assembly, which enables 1 to be a layer-structured molecular crystal with a monoclinic P21/c unit cell. The band structures and the atomic orbital contributions to the valence band maximum and conduction band minimum for 1 have also been evaluated by DFT calculations and rationally correlated with its optical absorption property. This study will help understand and discover new structures and structure−property relations of long-chain chemical systems.
研究领域:
材料化学
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晶体学
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理论化学
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DOI
PubMed
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 74
·70460-70467
·
IF 3.289
Ye Zhang,Zhe Sun,Chengzhen Shi,Feng Yan
An imidazolium thiopropionate-based redox couple is introduced as an improved organic alternative to iodide/triiodide (I−/I3−) couples for dye-sensitized solar cells (DSSCs). The synthesized thiolate/disulfide (BMIT/BMIDT) redox couple shows negligible absorption in the visible spectral range, and higher redox potential (+0.72 V vs. NHE) compared with that of I−/I3−. With the optimized redox couple (such as 0.1 M/0.1 M)/dye N719 formulation, the fabricated DSSCs exhibit an average overall power conversion efficiency (PCE) of 6.8% and 8.1% under the simulated air mass 1.5 solar spectrum illumination at 100 and 50 mW cm−2, respectively. However, a higher concentration of the BMIT/BMIDT redox couple (such as 0.4 M/0.4 M) decreases the PCE of the devices, due to the desorption of dye molecules from the TiO2 photoelectrode surface.
研究领域:
材料科学
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能源科学
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DOI
高影响因子
MACROMOLECULAR BIOSCIENCE
·
2014
·Vol. 14
·期 10
·1429-1436
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IF 3.65
Dongming Xing,Lie Ma,Changyou Gao
Maleimide-functionalized poly(ester carbonate)s are synthesized by ring-opening copolymerization of furan–maleimide functionalized trimethylene carbonate (FMTMC) with L -lactide and a subsequent retro Diels-Alder reaction. The maleimide groups on poly(ester carbonate)s are amenable to Michael addition with thiol-containing molecules such as 3-mercapto-1-propanol, 2-aminoethanethiol hydrochloride, and mercaptoacetic acid under mild conditions, enabling the formation of biodegradable materials with various functional groups (e.g., hydroxyl, amine, and carboxyl). In particular, the maleimide-functionalized poly(ester carbonate) is clicked with a laminin-derived peptide CQAASIKVAV. In vitro culture of PC12 cells shows that the maleimide-functionalized polymers, especially the CQAASIKVAV-grafted one, could support cell proliferation and neurite outgrowth. The maleimide-functionalized poly(ester carbonate)s provide a versatile platform for diverse functionalization and have comprehensive potential in biomedical engineering.
研究领域:
材料科学
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生物医学工程
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高分子化学
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细胞生物学
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产品关联
DOI
PubMed
高影响因子
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