Journal of Applied Spectroscopy
·
2023
·Vol. 90
·期 3
·670-675
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IF 0.7
Yan Kexin,Li Jinlan,Zheng Yuansong,Yan Zihong
Carbon dots (CDs) are of great significance for metal ion detection. Herein, CDs without surface functional groups were synthesized through a simple one-step hydrothermal method using 4,4'-bipyridine as the carbon source. The results showed that the synthesized CDs have good selectivity for Fe 3+ detection, and the CDs respond well to metal ions as Lewis bases. This detection method is unlikely to be affected by sewage systems because it has excellent sensitivity. The detection range for Fe 3+ concentrations is between 1.0 × 10 –8 and 1.0 × 10 2 mol/L, and the detection limit is 1.0 × 10 –8 mol/L.
研究领域:
分析化学
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环境科学
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DOI
高影响因子
LUMINESCENCE
·
2015
·Vol. 30
·期 8
·1269-1273
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IF 1.518
Yinggui Zhu,Lili Zou,Qin Dong,Derong Jiang
Quenching effects of bergenin, based on the electrochemiluminescence (ECL) of the tris(2,2′-bipyridyl)-ruthenium(II) (Ru(bpy) 3 2+ )/tri-n-propylamine (TPrA) system in aqueous solution, is been described. The quenching behavior can be observed with a 100-fold excess of bergenin over Ru(bpy) 3 2+ . In the presence of 0.1 m TPrA, the Stern–Volmer constant ( K SV ) of the ECL quenching is as high as 1.16 × 10 4 M −1 for bergenin. The logarithmic plot of the inhibited ECL versus logarithmic plot of the concentration of bergenin was linear over the range 3.0 × 10 −6 –1.0 × 10 −4 mol/L. The corresponding limit of detection was 6.0 × 10 −7 mol/L for bergenin (S/N = 3). In the mechanism of quenching it is believed that the competition of the active free radicals between Ru(bpy) 3 2+ /TPrA and bergenin was the key factor for the ECL inhibition of the system. Photoluminescence, cyclic voltammetry, coupled with bulk electrolysis, supports the supposition mechanism of the Ru(bpy) 3 2+ /TPrA–bergenin system. Copyright © 2015 John Wiley & Sons, Ltd.
研究领域:
分析化学
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药学
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DOI
PubMed
高影响因子
EUROPEAN POLYMER JOURNAL
·
2024
·
IF 5.8
Yirong Fan,Tao Wang,Hui Sun
Metal ion coordination has critical influence on the self-assembly behavior of amphiphilic polymers and the morphology of the obtained assemblies. Herein, an amphiphilic homopolymer with 2,2′-bipyridine (BPy) as side chain is synthesized (noted as PBPyAA), which can self-assemble into bowl-shaped nanoparticles (BNPs) in tetrahydrofuran (THF)/water. Taking advantage of the coordination interaction between BPy and metal ions, Fe 2+ is chosen to regulate the self-assembly behavior and the morphology of the assemblies of PBPyAA in two pathways. (Ⅰ) The aqueous solution of Fe 2+ with various concentrations is added to the THF solution of PBPyAA during self-assembly. (Ⅱ) Fe 2+ is added into the THF solution of PBPyAA before self-assembly, followed by the addition of deionized water to promote the self-assembly. The results show that the pathway Ⅰ facilitates the coordination of BPy and Fe 2+ . With the increase of the concentration of Fe 2+ aqueous solution, the coordination efficiency of BPy increases from 0.419 % to 7.789 %, leading to the transformation of BNPs to vesicles. Though the coordination efficiency of BPy also increases with the concentration of Fe 2+ in pathway Ⅱ, which is still quite low of 0.274 % to 0.366 %, and the morphology of the BNPs barely changes. In addition, ethylene diamine tetraacetic acid (EDTA), a strong chelating agent, is also added to promote the competitive complexation with BPy, resulting in the dissociation of BPy and Fe 2+ and the reversible transformation from vesicles to BNPs. Overall, the effect of Fe 2+ coordination on the self-assembly behavior of PBPyAA in two pathways is investigated and the reversible transformation of BNPs to vesicles is also achieved.
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 COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Ying Peng,Zhi-Gang Wang,Bao-Ping Qi,Cui Liu,Bo Tang,Zhi-Ling Zhang,Shu-Lin Liu,Dai-Wen Pang
Carbon nanodots (C-dots) with good biocompatibility have been extensively utilized as co-reactants for electrochemiluminescence (ECL) of the tris(2,2′-bipyridine)ruthenium(II) (Ru(bpy) 3 2+ ) system. However, the ECL intensity of this system is still relatively low and the mechanism of C-dots as co-reactants remains unclear, which greatly limits its further application in bio-analysis. In this work, we revealed that the carboxyl groups on C-dots are co-reactant sites for Ru(bpy) 3 2+ ECL by systematically investigating the contribution of carboxyl, hydroxyl and carbonyl groups on the surface of C-dots to the ECL intensity. Further treatment with hydrogen peroxide to increase the carboxyl-group content on C-dots resulted in a 10-fold increase in ECL intensity over the original Ru(bpy) 3 2+ /C-dots system. This work provides new insights for the rational design of ECL systems with C-dots as co-reactants and offers new chances for further applications of C-dots in the field of ECL.
研究领域:
分析化学
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生物医学工程
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2021
·
IF 13.273
Junshuai Zhang,Jialong Duan,Qiaoyu Zhang,Qiyao Guo,Furi Yan,Xiya Yang,Yanyan Duan,Qunwei Tang
Intramolecular structure of interfacial passivator highly determines the bond strength with detrimental defects located at perovskite surfaces and grain boundaries. Herein, we investigate the steric-charge-dependence of various π-conjugated pyridine derivatives on electron-donating ability to passivate inorganic CsPbIBr 2 perovskite film. The primary results demonstrate that the photovoltaic performances tightly correlate with the multidentate coordination sites and structure-steric hindrance because of their synergistic regulation on intramolecular electron-cloudy density and charge extraction. Comparing to pyridine and terpyridine treated devices, the bipyridine passivated device delivers an increased efficiency of 11.04% with a high open-circuit voltage of 1.301 V and improved stability after persistent irradiation over 20 h and storage for 60 days, which is one of the highest efficiencies for carbon-based all-inorganic CsPbIBr 2 solar cells. This work provides a direction to choose ideal passivator for high-efficiency perovskite optoelectronics.
研究领域:
材料科学
·
光伏技术
·
有机-无机杂化材料
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能源材料
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DOI
高影响因子
ELECTROCHEMISTRY
·
2015
·Vol. 83
·期 3
·155-160
·
IF 1.033
Yan-qing LI,Ying LUO,Li-jun LI,Hao CHENG,Wen-yi HUANG
In order to establish a simple, sensitive and rapid method for the determination of azithromycin, the gold electrode modified with Silica sol/Nano-Au/PVP/Ru(bpy)32+ was prepared, and the electrochemiluminescence (ECL) method was developed for the determination of azithromycin based on the sensitizing effect of azithromycin on Ru(bpy)32+. Moreover, the electrochemical behaviors and the electrochemical luminescence behaviors of the Ru(bpy)32+ system and the Ru(bpy)32+- azithromycin system were investigated by ECL respectively. The results show that the proposed electrode showed very good electrochemical activity and electrochemiluminescence response to the Ru(bpy)32+- azithromycin system, under the optimum experimental condition, the linearity of azithromycin concentration to ECL intensity was achieved in the concentration of azithromycin from 1.0 × 10−7 to 1.0 × 10−4 mol L−1 and the detection limit (S/N = 3) was 1.33 × 10−9 mol L−1. Through the parallel determination of 1.0 × 10−5 mol L−1 azithromycin for 8 times, the RSD of results was 1.82%, and the recovery ranging from 97.9% to 101.6% was obtained in the detection of azithromycin tabelets and the RSD was 1.36% (n = 5). The proposed method showed high selectivity and sensitivity and simplicity, and it could be applied to the analysis of azithromycin with satisfactory results.
研究领域:
分析化学
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药物分析
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生物医学工程
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DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 9
·3654-3663
·
IF 3.288
Dong-Mei Ma,Jing Wang,Hao Guo,Dong-Jin Qian
Thioxanthones (TXs) and viologens (VIOs) are important photo-sensitizers and electron mediators with interesting opto-electrochemical properties and potential applications for novel opto-electrical devices, displays, switches and sensors. Here, we reported the photophysical and electrochemical properties of newly synthesized TX–VIO binary derivatives, and their photo-/electrochromic displays in the ionic liquids and polymer gels. The precursor of TXBr (without the VIO substituent) gave off a blue light emission centered at about 437 nm with a quantum efficiency (QE) of approximately 0.2. For TX-VIOs, their QE was below 0.01; this significant luminescent quenching was attributed to an intramolecular energy transfer from the excited singlet state of TX to electroactive VIO. Thus, these TX–VIOs displayed good photochromic behaviors under ultraviolet and/or visible light radiation. Cyclic voltammograms of TX–VIOs showed two couples of chemically reversible waves centered at approximately −0.43 and −0.90 V (vs. Hg/Hg2Cl2). The former one was attributed to the electron transfer process of TX–VIO2+ ↔ TX–VIO+˙, and the latter one to that of TX–VIO+˙ ↔ TX–VIO0 together with that of TX(red)–VIO2+ ↔ TX(ox)–VIO2+. Finally, sandwiched types of transparent and flexible photo- and electrochromic devices were constructed with the use of TX–VIOs in the ionic liquids and polymeric gels as the light-sensitizer and color display layer. These devices displayed a good transmittance and good reversible color (pink, blue and colorless) change behavior under visible light radiation or an applied bias of −2.4 V.
研究领域:
化学
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材料科学
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光电子学
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DOI
高影响因子
Chemosensors
·
2024
·Vol. 12
·期 3
·39
·
IF 3.7
Yu Zhang,Chang Liu,Rongqiu Yan,Chenghong Lei
Bipyridyl Ruthenium-decorated Ni-MOFs on multi-walled carbon nanotubes (MWCNT-RuBpy@Ni-MOF) were synthesized. In an alkaline solution, the glucose was electrocatalytically oxidized at +0.5 V vs. Ag/AgCl at the composite interface of MWCNT-RuBpy@Ni-MOF on a glassy carbon electrode. The Ni3+/Ni2+redox couples in Ni-MOFs played a key role as the active center for the catalytic oxidation of glucose at the electrode, where both RuBpy and MWCNTs enhanced the current responses to glucose. The resulting enzymeless glucose sensor from MWCNT-RuBpy@Ni-MOF exhibited a wide range of linear responses, high sensitivity and selectivity for the determination of glucose.
研究领域:
材料科学
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电化学
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纳米技术
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分析化学
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产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2018
·
IF 11.698
Heng Li,Meng Li,Lijun Zhang,Xiang Zhang,Yundi Ma,Bing Yu,Qiang Wei,Shuhua Yin
Dipyridyl benzene skeleton (Py-ph-Py) was synthesized and chem.-grafted on titanium dioxide through hydrothermal method. The novel organic/inorganic hybrid structure DPA-TiO 2 displays remarkable photocatalytic activity and stability. The structural and surface characterization revealed that hybrid composites were linked with chemical ester bonds, which enabled the organic skeletons on the surface to act as charming transmitters of charges. The hybrid structure not only shortens the bond gap of catalyst hence to make charges be generated under visible light, but also transfers the photogenerated electrons in time to avoid them recombining with positive holes. In addition, the excellent adsorption capacity to waste organic compounds also contributes to its wonderful catalytic properties. The novel methodology is of great instructive to the utilization of solar energy to dispose environmental pollutions.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
JOURNAL OF INVERTEBRATE PATHOLOGY
·
2018
·
IF 2.511
Tongxiang Song,Huijie Liu,Tengteng Lv,Xuelin Zhao,Yina Shao,Qingxi Han,Chenghua Li,Weiwei Zhang
Under low iron bioavailability environment, many bacteria acquire iron for growth and survival through siderophore-mediated iron acquisition systems. However, until now, little research on the growth, siderophore production and siderophore receptors of Vibrio splendidus Vs under iron limited conditions has been reported. In our present study, V. splendidus Vs could survive in media supplemented with 160 µM 2,2′-dipyridyl (DIP), but 74.5% of the growth was suppressed at 48 h, while the siderophore production of V. splendidus Vs increased by 35.9%. As the OD 600 of V. splendidus Vs decreased when the concentration of DIP was increased from 40 to 80 µM, the siderophore production of V. splendidus Vs increased from 34.0% to 43.4% at 24 h, and it was further determined to be a hydroxamate siderophore. To explore the potential siderophore receptors anchored on the outer membrane of V. splendidus Vs, outer membrane proteins from cells grown with and without 80 µM DIP were extracted and the differentially expressed proteins were identified by SDS-PAGE and MALDI-TOF/TOF MS. Five proteins, aerobactin siderophore receptor IutA, enterobactin receptor protein FepA, ATP synthase subunit A, ATP synthase subunit B and the ATP synthase F0F1 subunit beta were identified. Real-time reverse transcriptase PCR showed that mRNA levels of iutA , fepA, atpA , atpB and atpβ - F0F1 were upregulated 271.5-, 15.1-, 1.1-, 2.5- and 67.9-fold respectively, after 6 h in cells treated with 80 µM DIP. In addition, the promoters of the siderophore receptor genes of iutA and fepA had apparent ferric uptake regulator (Fur) binding sites. Combined with the simultaneous production of both the hydroxamate siderophore and its corresponding aerobactin siderophore receptor IutA, these results suggested that there might be a hydroxamate siderophore-IutA mediated iron uptake pathway in V. splendidus Vs.
研究领域:
微生物学
·
海洋生物学
·
分子生物学
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产品关联
DOI
PubMed
高影响因子
ENERGY & FUELS
·
2018
·
IF 3.024
Qing-ying Li,Yingzhou Lu,Hong Meng,Chunxi Li
CuSiF6(4,4′-bipyridine)2 (SIFSIX-1-Cu) is a crystalline complex of CuSiF6 and 4,4′-bipyridine with rich microporosity, high specific area (∼1100 m2·g–1), and negligible hydroscopicity. Furthermore, this complex can be synthesized and dried under much milder conditions compared with conventional MOFs. In this paper, three complexes, SIFSIX-1-Cu(1), SIFSIX-1-Cu(2), and SIFSIX-1-Cu(3), were prepared using Cu(BF4)2, Cu(NO3)2, and CuSO4, respectively, as the copper sources, and their structure was characterized by SEM, XPS, XRD, and N2-adsorption desorption measurements. The adsorptivity of these compounds for dibenzothiophene (DBT) in model oil follows the order of SIFSIX-1-Cu(1) > SIFSIX-1-Cu(2) > SIFSIX-1-Cu(3), which is consistent with the order of their crystallinity and specific areas. The adsorption amount of SIFSIX-1-Cu(1) is 49.5 mg-S·g–1 for DBT model oil at an equilibrium sulfur concentration of 700 ppm and 303.15 K, and follows the order of DBT > benzothiophene (BT) > 3-methylthiophene (3-MT) for other sulfur compounds. The adsorptive desulfurization performance of SIFSIX-1-Cu is one of competitive sorbents among MOFs. The used sorbent can be regenerated easily by methanol washing and can be reused with an approximately 11% loss of adsorption capacity after five cycles. This study reveals the potential application of microporous crystal complexes for fuel desulfurization.
研究领域:
材料科学
·
能源化学
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产品关联
DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY B-ANALYTICAL TECHNOLOGIES IN THE BIOMEDICAL AND LIFE SCIENCES
·
2013
·
IF 2.487
Guimei Zhu,Shihua Long,Hao Sun,Wen Luo,Xia Li,Zaibin Hao
A novel sensitive method based on tertiary amine labeling for the analysis of gibberellins (GAs) by capillary electrophoresis (CE) coupled with electrochemiluminescence (ECL) detection was proposed. GA 3 was tagged with 2-(2-aminoethyl)-1-methylpyrrolidine (AEMP) using N, N′-dicyclohexylcarbodiimide (DCC) and 3,4-dihydro-3-hydroxy-4-oxo-1,2,3-benzotriazine (HOOBt) as coupling agents in acetonitrile to produce GA 3 -AEMP-derivative. The GA 3 -AEMP-derivative was injected into CE by electrokinetic injection and detected by Ru(bpy) 3 2+ -based ECL . The parameters affecting derivatization, detection and separation such as concentration of reactants, detection potential, pH and concentration of separation buffer, were investigated in detail. Under optimum conditions, the linear concentration range for GA 3 was from 2.0 × 10 −7 to 1.28 × 10 −4 M with a correlation coefficient of 0.9997. The detection limit was 8 × 10 −8 M (S/N = 3). The relative standard deviations of migration time, peak intensity and peak area for nine continuous injections of 2.0 × 10 −5 M GA 3 -AEMP-derivative were 1.0%, 2.1% and 4.2%, respectively. The developed approach was successfully applied to the determination of total GAs in the stem, leaf and seed of soybean ( Glycine max [L.] Merr.) with recoveries in the range from 89.6% to 99.3%.
研究领域:
植物学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）