TALANTA
·
2023
·
IF 6.1
Xuejia Chen,Min Zhang,Xuejun Li,Jin Xu,Ying Liang
This paper discusses the first-time study of a naphthalene-based fluorescent probe—naphthalene-2,3-dicarboxaldehyde (NDA), in combination with merging-zone flow injection analysis for the automated fluorescence determination of ammonium. The determination was contingent on detecting the fluorescent product of NDA-SO 3 2- -NH 4 + , which has maximum excitation and emission wavelengths of 508 nm and 564 nm, respectively. And the possible sensing mechanism of NDA-NH 4 + was proposed. The effects of the reaction parameters, including reagent concentrations, reaction flow rate , coil length, reaction temperature, and pH were optimized. Under optimal conditions, this method afforded a sampling rate of 8 h −1 , a limit of detection of 0.045 μmol L −1 , and RSD of 3.68% (n = 14) with 1.50 μmol L −1 ammonium, and the calibration range was 0.045–6.00 μmol L −1 . Examination of the organic nitrogen interference confirmed that the method attracts minimal interference from organic nitrogen, and the stability of the NDA reagent facilitates its field application. Other exhibited advantages include low reagent consumption and high automation; the method has been utilized in the successful determination of ammonium in freshwater and rainwater. The development of NDA applications for ammonium determination also provides more options for fluorometric determination of ammonium.
研究领域:
环境科学
·
分析化学
✓ 已验证
DOI
PubMed
高影响因子
MOLECULES
·
2024
·Vol. 29
·期 14
·3396
·
IF 4.2
Zhengyang Wang,Shuting Wang,Yuexing Zhang,Mingliang Ma
A series of fluorescent molecules with 1,1-dimethylnaphthalene-2(1H)-one as the core were synthesized to overcome aggregation quenching and emit bright green fluorescence. The low molecular weight of these molecules led to them to smoothly pass through the cell membrane and penetrate deep into the nucleus to emit the corresponding fluorescence. Among them, NC-4-Br and NC-5-3O have good optical and in vitro properties and showed potential for use as fluorescent probes.
研究领域:
生物化学
·
分子生物学
·
医学成像
✓ 已验证
DOI
PubMed
高影响因子
LANGMUIR
·
2023
·
IF 3.9
Longnan Yu,Sihao Li,Yan Lu,Zhongping Wang,Mingming Fu,Sheng Wei,Changgang Xu,Qing Wang,Xiaoqing Liu,Li Wang
The delicate regulation of structural phase transition can provide advanced approaches for fabricating desired and well-organized nanoarchitectures on surfaces. Introduction of metal ions into pure organic systems can facilitate the phase transition from hydrogen-bonded structures to metal–organic structures by coordinating with organic molecules. However, it remains a challenge to attain a phase transition dominated by variable metal coordination configurations through adjustment of the metal ion concentration. Herein, we report the phase transitions of naphthalene-2,3-carbonitride (2,3-DCN) molecules on highly oriented pyrolytic graphite (HOPG) under varying solvents and Cu2+ ion concentrations. By integrating data from scanning tunneling microscopy imaging and density functional theory calculations, it is demonstrated that phase transitions of 2,3-DCN occur through forming diverse coordination configurations where Cu2+ ions can coordinate with 2,3-DCN and 1-nonanoic acid or Cl– ions to form different ligand components with a coordination number of 4 when varying the molar ratios of 2,3-DCN to Cu2+ ion in the 1-nonanoic acid solvent. However, in the case of 1-heptanoic acid as a solvent, the self-assembly structure of 2,3-DCN only changes via the alteration of hydrogen bonding sites and Cu2+ ions do not coordinate with 2,3-DCN molecules. These findings provide valuable insights into the coordination behavior of metal ions in different solvents.
研究领域:
材料科学
·
表面化学
·
计算化学
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产品关联
DOI
PubMed
高影响因子
ANALYST
·
2018
·Vol. 143
·期 20
·5054-5060
·
IF 3.864
Bo Lin,Li Fan,Jinyin Ge,Wenjia Zhang,Caihong Zhang,Chuan Dong,Shaomin Shuang
A mitochondrial-targeted pH fluorescent probe 4-(2-(6-hydroxynaphthalen-2-yl)vinyl)-1-methylpyridin-1-ium was facilely synthesized via the carbon–carbon double bond bridging of 6-hydroxy-2-naphthaldehyde and 1,4-dimethylpyridinium iodide salt. The probe exhibited remarkable pH-dependent behavior in the linear range of 7.60–10.00, with a pKa value of 8.85 ± 0.04 near mitochondrial pH. A significantly large Stokes shift of 196 nm was obtained, which reduces the interference of excitation light. Application of the probe in live HepG2 cells indicated that the probe had excellent mitochondrial targeting ability and was successfully used to visualize mitochondrial pH fluctuations in live cells.
研究领域:
化学
·
生物化学
·
细胞生物学
·
荧光成像
✓ 已验证
DOI
PubMed
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2013
·Vol. 41
·期 5
·3243-3260
·
IF 0.88
Fa HuanBao,Zhou JingTing,Zhang Dong,Yin Wei,Zhang HaiFeng,Huo DanQun,Hou ChangJun,Luo XiaoGang,Mao YaLi,Zhang Jin
A novel 4-(2-{[6-(1,1-dicyanoprop-1-en-2-yl)naphthalen-2-yl](methyl)amino} ethoxy)-4-oxobutanoic acid ( 5 ) fluorescent probe for β-amyloids was synthesized by catalytic acylation using 4-dimethylaminopyridine between succinic anhydride and (1-{6-[(2-hydroxyethyl)(methyl) amino]-2-naphthyl}ethylidene)malononitrile ( 4 ). The structures of all compounds were identified by proton nuclear magnetic resonance spectroscopy, infrared spectroscopy, mass spectrometry, and ultraviolet–visible (UV–Vis) spectroscopy. The UV–Vis and fluorescence spectra of 1-{6-[(2-hydroxyethyl)(methyl) amino]-2-naphthyl}ethan-1-one ( 3 ), 4 , and 5 in solvents with different polarities were investigated, and the effects of solvent polarity on the optical properties of the three compounds were studied. The objective product 5 showed high binding affinities toward Aβ(1–40) aggregates in vitro ( K
d = 29.4 nmol/L) by fluorophotometry. This study provides a powerful fluorescent probe for the molecular diagnosis of Alzheimer’s disease.
研究领域:
化学
·
生物化学
·
神经科学
·
分子生物学
·
药学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2023
·
IF 6.4
Xin Li,Cancan Bian,Jun Zhang,Jian Hong,Rusheng Fu,Xufeng Zhou,Zhaoping Liu,Guangjie Shao
Silicon monoxide (SiOx, x ∼ 1) has emerged as a highly promising candidate for high-energy-density lithium-ion batteries due to its high specific capacity and suitable working potential. Nevertheless, the formation of a large quantity of irreversible products, such as Li2O and lithium silicates, during the initial lithiation process results in a low initial coulombic efficiency (ICE) of SiOx, which is a significant impediment to its commercial application. To overcome this limitation, two lithium aromatic complexes, namely, lithium-naphthalene-2-methyl-tetrahydrofuran (N-LAC) and lithium-biphenyl-2-methyl-tetrahydrofuran (B-LAC), with a low redox potential are used to pre-lithiate SiOx anodes. The differences in lithiation kinetics and efficacy of the two LAC solutions are identified and assessed by scrutinizing the pre-lithiation process of SiOx materials. It is revealed that both pre-lithiation agents produce solid electrolyte interphase (SEI) films on the material surface enriched with substances such as LiF, Li2CO3, and ROCO2Li, but the LiF content in the SEI of the N-LAC pre-lithiated electrode is significantly higher. Furthermore, the surface roughness of the N-LAC pre-lithiated electrode is lower, and the horizontal distribution of mechanical properties and surface potential tend to be more homogeneous, even during cycling, at approximately the same degree of lithiation. The results indicate that the N-LAC solutions not only improve the ICE of the SiOx material but also optimize the interfacial and structural stability of the SiOx electrode. When the pre-lithiated SiOx anode is paired with lithium-rich layered oxide cathode materials, the energy density and ICE are significantly improved compared to the cell using pristine SiOx anode.
研究领域:
材料科学
·
电化学
·
电池技术
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Wenjing Wang,Jing Wu,Yuxin Xing,Zonghua Wang
Herein, a kind of red emissive carbon dots (BNCDs) based on 1,1′-binaphthyl-2,2′-diamine (BNDM) and citric acid as carbon source were prepared through one-pot solvothermal method . The synthesized BNCDs have uniform size distribution, photobleaching resistance, and excitation wavelength-independent emission performance with the optimal fluorescence at λ ex /λ em = 540/603 nm. The composite films of BNCDs in polyvinyl alcohol (PVA) matrix exhibited bright red emission under ultraviolet irradiation , indicating their potential in solid-state luminescence. Also, BNCDs shows unique solvent-dependent phenomenon, the optical behavior can be tuned by the change of solvent polarity. Another striking observation was that BNCDs can be applied as a fluorescence sensor for highly sensitive quantitative detection of trace water in organic solvents because it’s polarity-sensitive property. Through fluorescence “on–off–on” mechanism, BNCDs could be used as a fluorescence sensor for detection of Fe 3+ and F - with LOD of 0.219 and 0.0104 μmol L −1 , respectively. This strategy offers an efficient approach for preparing red emissive carbon dots and lays a foundation for its multi-functional application.
研究领域:
材料科学
·
纳米技术
·
分析化学
·
光学传感
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）