SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2019
·
IF 2.931
Fanyong Yan,Keqing Fan,Tengchuang Ma,Jinxia Xu,Jie Wang,Cong Ma
Two Schiff base fluorescein probes (FDA, FDH) based on fluorescein-aldehyde and nitroaniline derivatives were synthesized. The effects of amino and hydrazine substituents in fluorescein backbones were examined via fluorescence and absorbance spectra. In the presence of Ce 4+ , the fluorescence of FDA was quenched due to the ligand to metal charge transfer (LMCT). Hypochloric acid can react with the C N bond, and blocking the photo induced electron transfer (PET) of FDH leads to enhancement of the fluorescence. FDA showed detection limits for Ce 4+ and OCl − as low as 63 nM in concentration range of 0–4 μM. FDH showed detection limits for OCl − as low as 0.8 μM in concentration rang 0–100 μM. Polyvinylidene fluoride (PVDF) membrane containing the probes was prepared for the real-time qualitative detection of Ce 4+ and OCl − in real water samples. The probes were successfully applied to biological imaging in vascular smooth muscle cells (VSMCs) and are expected to find applications in biosensing.
研究领域:
分析化学
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生物化学
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环境科学
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DOI
高影响因子
TRANSITION METAL CHEMISTRY
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2015
·Vol. 40
·期 7
·769-777
·
IF 1.306
Wang Hu,Zhang Xiao-Yin,Bi Cai-Feng,Fan Yu-Hua,Meng Xiang-Min
Abstract Three complexes, Zn(C 40 H 36 N 4 O 8 )·3CH 3 OH ( 1 ), Ni(C 40 H 36 N 4 O 8 )·3CH 3 OH ( 2 ) and Co(C 40 H 36 N 4 O 8 )·3CH 3 OH ( 3 ), with a sexidentate (N 2 O 4 ) symmetric bis-Schiff base ligand (C 40 H 36 N 4 O 8 = 1,2-bis(2-methoxy-6-formylphenoxy)ethane- l -tryptophan) have been synthesized and characterized by physicochemical and spectroscopic methods. The X-ray crystal structures show that the metal atoms of three complexes are all six-coordinated by two nitrogens from C=N groups, two oxygens from ether groups and two carboxylic oxygens in the mono-ligand, forming a distorted octahedral geometry. The complexes were screened as photocatalysts for the degradation of methylene blue, rhodamine B and methyl violet. All three complexes proved to be good candidates for the photocatalytic degradation of methylene blue and complexes 2–3 are also good photocatalysts for the degradation of rhodamine B. The mechanism of these photocatalytic degradations is discussed. Graphical Abstract The main characterization and photocatalytic experiment of three complexes.
研究领域:
无机化学
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材料科学
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产品关联
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2023
·
IF 4.4
Xianfa Zhang,Shuaibing Yu,Xuliang Pang,Xiaochen Ren,Bo Zhang,Jinming Kong,Lianzhi Li
A solvent-directed, new Schiff base multiple correspondence fluorescent probe, (E)-2-(2-hydroxybenzylidene) hydrazine-1-carboxamid (L), was synthesized for selective sensing of Cu 2+ and Mg 2+ ions. L showed excellent selectivity and high sensitivity toward Cu 2+ in “turn off” mode with a detection limit of 40.5 nM in 10 mM, pH = 7.0 PBS buffer. Contrary to that, when acetonitrile was used as the solvent, L exhibited highly selective and sensitive fluorescence sensing ability for Mg 2+ in “turn on” mode with a detection limit of 9.5 nM. L can coordinate to Cu 2+ and Mg 2+ in a 1:1 molar ratio, respectively, evidenced by Job’s plot analysis. Their binding modes were investigated by NMR, IR and XPS spectroscopies. Moreover, the satisfied results were obtained when L was used to detect Cu 2+ and Mg 2+ in real water samples.
研究领域:
分析化学
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环境科学
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产品关联
DOI
PubMed
高影响因子
LUMINESCENCE
·
2024
·Vol. 39
·期 10
·e4914
·
IF 3.2
Lingjie Hou,Linlin Wang,Chenhua Deng,Pengyue Jin,Chaochao Wen,Wenjia Zhang,Wenting Liang
Ca 2+ ion as a second messenger in signaling pathway plays many vital roles in many biological phenomena. Thus, it is of significance for developing effective probes to detect Ca 2+ ion specifically. Herein, a new Schiff base fluorescent probe FPH , fluorescein monoaldehyde (2-aminomethylpyridine) hydrazone, was designed and synthesized to identify Ca 2+ in DMSO aqueous solution. The probe FPH revealed significant responses to Ca 2+ with a fluorescence enhancement at 540 nm, exhibiting an evident fluorescence change from ultraweak luminescence to bright green. Otherwise, the FPH displayed a good linear range of 0.67 × 10 −6 to 3.33 × 10 −6 mol/L with a lower detection limit at 7.02 × 10 −8 mol/L. The probe FPH were further successfully utilized to detect Ca 2+ in living cells by an increased bright green fluorescence.
研究领域:
生物化学
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分析化学
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产品关联
DOI
PubMed
高影响因子
EUROPEAN POLYMER JOURNAL
·
2020
·
IF 3.862
Xinxing Zhang,Qingyin Wang,Shaoying Liu,Lilei Zhang,Gongying Wang
A new Schiff base flame retardant monomer with nitro group ( NO 2 ), 5-((4-nitrobenzylidene) amino) isophthalic acid (NBA) was firstly synthesized to prepare fire-safety PET copolyester (NBA n PET). The group of NO 2 passivated the cross-linking reactivity of Schiff Base by affecting the formation of the intermediate states of the cross-linking reaction and further to improve the cross-linking temperature of NBA n PET to the temperature range (347–372 °C) from that of (250–348 °C), which showed better machinability in a broad processing temperature zone. In additional findings, the new synthesized NBA Schiff Base helped to shorten the time of polycondensation of PET with the advantage to save 58% of the reaction time by its acid structure. And the group of NO 2 enhanced the thermal stability of NBA n PETs, which improved its residue char in high temperature to enhance its flame retardancy. NBA 10 PET with NBA (7.9 mol%) processed LOI of 32% and V-0 of UL-94 without drip. The analysis of mechanism showed that the group of NO 2 in NBA did not decompose into the gas phase and NBA performed the mechanism of condensed phase during combustion of Schiff Base modified PET. The newly prepared NBA n PET with these better properties could possess wider application prospects.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
Methods and Applications in Fluorescence
·
2019
·Vol. 8
·期 1
·015002
·
IF 2.94
Fanyong Yan,Yingxia Jiang,Keqing Fan,Tengchuang Ma,Liang Chen,Cong Ma
The effect of aminopyridines substituted at different positions on the fluorescence properties deserves to be studied. Since 2-aminopyridyl-based probes have been reported, the effects of 3-aminopyridine and 4-aminopyridine on the performance of fluorescein probes were discussed in here. Two Schiff base fluorescein probes FN-1, FN-2 were designed and synthesized. Among them, since the ligand shows a highly selective and sensitive response to metal charge transfer (LMCT), the fluorescence of FN-1 can be quenched by Ce3+ ions in PBS buffer. At the same time, a specific precipitation reaction between Ce3+ and F− releases the free probe to restore the fluorescence of FN-1. Therefore, FN-1 can be used for the recyclable 'ON-OFF-ON' detection of Ce3+and F−. The detection limits for Ce3+and F− are 4.48 μM and 11.58 μM in concentration range of 0–50 μM and 0–150 μM. However, due to the para position of N and amino groups on 4-aminopyridine, the spatial structure of FN-2 cannot be complexed with ions, resulting in poor selectivity. Polyvinylidene fluoride (PVDF) membrane containing FN-1 were prepared for the real-time qualitative detection of Ce3+and F− in real water samples. FN-1 exhibits high water solubility and biocompatibility and has been successfully applied to biological imaging in vascular smooth muscle cells (VSMCs).
研究领域:
分析化学
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生物化学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF COORDINATION CHEMISTRY
·
2021
·
IF 1.751
Guo Lina,Yuanyuan Gao,Limin Han
A tridentate Schiff base probe L (2-NC5H4)C(H)=N(C6H4OH-2) was synthesized via a facile reaction. Probe L showed weak fluorescence emission that originated from intermolecular proton transfer in solution. With addition of Cu2+, the emission of L was quenched by the paramagnetic nature of Cu2+. However, after the solution of L and Cu2+ was refluxed, the emission presented a completely opposite result changing from fluorescent quenching to fluorescent enhancement. The fluorescent enhancement was attributed to a planar cis-structure of Cu2+ complex. Hence, a strategy for change of emission behavior of fluorescent probe L to Cu2+ was developed; a “turn on” mode of detection Cu2+ was realized in methanol solution. A simple refluxing made probe L work as a light-up fluorescent sensor for Cu2+ in methanol solution and gave improvement of sensitivity and selectivity in detection of Cu2+. When H2O was added into the solution of the Cu2+ complex, fluorescent enhancement increased and it can be used to detect water content in methanol.
研究领域:
化学
·
分析化学
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产品关联
DOI
高影响因子
ACS Omega
·
2023
·
IF 4.1
Jun Li,Yuhang Hua,Qiannan Yuan,Wenqi Gou,Hao Sun,Long Lin,Mengtao Wang,Mingxun Yu,Aiwen Qin
A corolla-shaped Schiff base polymer was synthesized from terephthalaldehyde (TPAD), glutaraldehyde (GA), and p-phenylenediamine (PPD) by block copolymerization, and Schiff base iron complexes were formed by doping with FeCl3. The microscopic morphology, crystal structure, and elemental valence state were characterized by field emission scanning electron microscopy (FESEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). Comparing the change of conductivity before and after Fe3+ doping, it was found that the conductivity did not break away from the category of insulator, and the doped sample is a paramagnetic material. Morphological changes were observed by adjusting the ratio of GA to TPAD, and it was found that the corolla-like structure was most complete when the ratio of GA to TPAD was 2:1, and its Schiff base iron complex absorbed waves better. At a thickness of 3 mm, the absorption effect can reach below −10 dB at 12.44–15.16 GHz, and the maximum absorption value is −45.07 dB at a thickness of 3.8 mm; it is an organic absorbing agent with excellent impedance matching and absorbing properties.
研究领域:
材料科学
·
化学
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产品关联
DOI
PubMed
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2024
·
IF 4.3
Brian Musikavanhu,Tingting Pan,Quanhong Ma,Yongdi Liang,Zhaoli Xue,Lei Feng,Long Zhao
Fluorescent chemosensors are often preferred for tracking toxic ions because of their non-destructive measurement and ease of use in environmental real samples and biosystems. Exploring high selectivity, great sensitivity, and biocompatible fluorophores with facile, accessible and dual-responsive features is currently highly demanding. A coumarin-based naphthol hydrazone Schiff base chemosensor, NaChro , is designed and synthesized in a two-step process to detect toxic metal ions with strong emission. Fluorescence spectra analysis demonstrates that the probe binds to Hg 2+ and Pb 2+ ions with a 1:1 and a 2:1 stoichiometry, respectively, with high sensitivity, short response time and minimal interference from other metal ions. The observed reversible turn-on reaction was attributed to the inhibition of C = N isomerization and excited-state intramolecular proton transfer (ESIPT) processes once the ions were introduced. The practical applications of NaChro are successfully addressed in paper strips, various water samples, HeLa cells and Zebrafish, demonstrating that the probe can detect and track Hg 2+ and Pb 2+ ions in environmental samples and biosystems.
研究领域:
环境科学
·
生物化学
·
分析化学
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产品关联
DOI
PubMed
高影响因子
Analytical Methods
·
2025
·
IF 2.6
Qian Sun,Lu Ren,Jing Liu,Zhaoyun Yang,Dawei Zhang,Shuangbao Li
A Schiff base fluorescent probe, HTT, based on a sulfonylhydrazone structure was designed and synthesized for the sensitive and selective detection of Cu2+. The probe HTT exhibits good anti-interference performance toward Cu2+ in the presence of a variety of metal ions. After the addition of Cu2+, it can quickly respond within 40 seconds, and the fluorescence detection limit is 1.10 nM. The coordination ratio of probe HTT and Cu2+ is 2 : 1, and the coordination reaction between CN, SO and Cu2+ limits the formation of hydrogen bonds between the hydroxyl group and CN, disrupting the spatial coplanar effect of the probe molecule and thereby inducing fluorescence quenching. The probes can be recovered and reused using EDTA for the detection of Cu2+. The probe was also applied to the successful monitoring of Cu2+ in living cells and real water samples.
研究领域:
分析化学
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生物化学
·
细胞生物学
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产品关联
DOI
PubMed
高影响因子
ACS Applied Polymer Materials
·
2024
·
IF 4.4
Tong Xue,Dunjie Fang,Leilei Si,Yunjie Yin
Textiles with antibacterial and antiultraviolet properties have gained significant attention because of their ability to protect the human body. This study presents the design and synthesis of a Schiff base for chitosan modified with salicylaldehyde and titanium dioxide (SCSB-Si-TiO2). SCSB-Si-TiO2 was coated onto cotton fabrics by using a layer-by-layer self-assembly method, resulting in functional cotton fabrics (SCSB-Si-TiO2/cotton) with excellent antibacterial and antiultraviolet properties. This functional textile demonstrated excellent antibacterial effects with inhibition rates of 95.22% against Escherichia coli and 98.99% against Staphylococcus aureus. Moreover, SCSB-Si-TiO2/cotton exhibited outstanding antiultraviolet characteristics, with a ultraviolet protection factor (UPF) value of 110.9, and maintained a UPF value above 82 even after 25 washing cycles. Additionally, SCSB-Si-TiO2/cotton exhibited good hydrophobicity with a water contact angle of 123.6°. The breathability of SCSB-Si-TiO2/cotton decreased slightly, and its tensile strength increased, which was sufficient to meet daily life requirements. This study presents an approach to the development of multifunctional textiles.
研究领域:
材料科学
·
纺织工程
·
生物学
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产品关联
DOI
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2023
·
IF 4.3
Shoushun Huang,Hua Yan,Liangbin Lin,Hongyu Guo,Fafu Yang
Although some detection methods for Al 3+ have been presented, the rapid, simple and in-situ detection on Al 3+ with high selectivity and sensitivity was still anticipated. In this work, a “turn-on” and color-changed fluorescence sensor for Al 3+ was reported with the high selectivity and low detection limitation. A bis-tetraphenylimidazole Schiff base ( bis-TPMS ) was prepared by simple “1 + 2” condensation in 80 % yield. It displayed the strong “turn-on” purple fluorescence on sensing Al 3+ selectively among various metallic ions and anions. The detection limitation was as low as 1.56 × 10 -8 M. The sensing mechanism was deduced as Al 3+ was located in the opening cavity composed of HC = N, OH and NH groups. This sensing ability of bis-TPMS for Al 3+ was successfully used in test paper, on-site detection for real samples of gastric tablets, indicating the good application prospect in the simple, rapid and in-situ detection for Al 3+ in real samples.
研究领域:
分析化学
·
材料科学
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DOI
高影响因子
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