APPLIED CATALYSIS B-ENVIRONMENTAL
·
2023
·
IF 22.1
Fengwei Huang,Xiaoyun Dong,Yuexin Wang,Xianjun Lang
Conjugated microporous polymers (CMPs) have evloved into versatile visible light photocatalysts. Narrowing the bandgaps of CMPs could capture more visible light without shifting the suitable position with an established electron acceptor like thiazolo[5,4- d ]thiazole (TzTz). Here, benzene-1,3,5-tricarbaldehyde (Bz-CHO) and benzo[1,2-b:3,4-b':5,6-b'']trithiophene-2,5,8-tricarbaldehyde (BTT-CHO) are adopted to undergo condensation with dithiooxamide, preparing two TzTz-bridged CMPs, namely TzTz-Bz and TzTz-BTT. Thereby, TzTz-BTT could capture visible light more substantially than TzTz-Bz due to narrowing the bandgap. Endowed by TzTz, both TzTz-BTT and TzTz-Bz possess similar positions for the activation of O 2 and can drive the subsequent formation of imines. However, TzTz-BTT, with a narrower bandgap, could capture more green light to drive the electron and proton transfer for the selective formation of imines with higher conversions than TzTz-Bz. This work suggests that CMPs can be equipped with extensive visible light absorption for photocatalytic selective oxidations.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2013
·
IF 3.535
Bang Lin Li,Jun Hua Luo,Hong Qun Luo,Nian Bing Li
A novel electrochemical sensor based on d -penicillamine ( d -PA) molecularly imprinted polypyrrole film on a glassy carbon electrode was fabricated. The complementary cavities located on the surface of molecularly imprinted polypyrrole film were used for subsequent template recognition. It was confirmed that the molecularly imprinted polypyrrole modified glassy carbon electrode (MIP-GCE) showed greater recognition ability than the non-molecularly imprinted polypyrrole modified glassy carbon electrode (NIP-GCE). Considering the electrochemical oxidation of d -PA with ferrocyanide and the specific recognition of molecular imprinting technique, the highly selective determination of d -penicillamine was achieved on the d -PA molecularly imprinted polypyrrole modified glassy carbon electrodes using ferrocyanide as an electrochemical probe. Several factors affecting sensor response, such as film thickness, template concentration, and the pH of phosphate buffer solution, were investigated to achieve optimum electrochemical response to d -PA at the MIP-GCE. The MIP-GCE revealed highly linear behavior in the concentration range of 10.0–480.0 μmol L −1 with the detection limit of 3.5 μmol L −1 for d -PA. The novel sensor has been applied to the determination of d -PA in real biological samples with satisfactory results.
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APPLIED ORGANOMETALLIC CHEMISTRY
·
2020
·Vol. 34
·期 4
·e5451
·
IF 3.14
Shuang Huang,Xi Hong,Yong Sun,He-Zhen Cui,Quan Zhou,Yue-Jian Lin,Xiu-Feng Hou
Six tridentate NNN ligand precursors derived from 2-(pyridin-2-yl)benzo[d]thiazole(PBT) with different linkers, PBT NN X N (X = NH, NMe, O, S) ( 1a – 1f ), have been successfully prepared. The electronic properties of PBT NN X N ligands are well tunable by differing linkers between PBT skeleton and the pyridine ring, and/or by introducing electron-donating/withdrawing groups on the pyridine ring (R = OMe or F). The ligand precursors and representative complexes Ru ( PBT NN NH N )Cl 2 (PPh 3 ) ( 2a ), Ru ( PBT NN NMe N )Cl 2 (PPh 3 ) ( 2b ), and Ru ( PBT NN S N )Cl 2 (PPh 3 ) ( 2f ) have been characterized by NMR spectroscopy, high-resolution mass spectroscopy, and Fourier transform infrared (FT-IR). The molecular structures of 1f , 2a , and 2f have been determined by X-ray diffraction study. The results indicate that PBT NN NH N ligand in the complex presented coplanar with two five-membered chelating rings. It should be noted that 2a featuring a NH group exhibits superior performance compared to those with other linkers (such as NMe, O, or S). A variety of heterocyclic and aromatic nitriles with aromatic and aliphatic alcohols have been explored in α -alkylation for good to excellent yields. Based on kinetic experiments and mechanistic studies, a proposed mechanism was put forward. Ru-H species and benzaldehyde, which was oxidized from benzyl alcohol, were detected in the catalytic cycle.
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JOURNAL OF LUMINESCENCE
·
2019
·
IF 2.961
Chengjun Wang,Ying Qian
A red emissive fluorescent probe 1,7-dimethyl-3,5-bis(4-methoxyphenyl-vinyl)-8-(10-n-butyl-10H-phenothiazine-3-yl)BODIPY 1,7-dimethyl-3,5-bis(4-methoxyphenyl-vinyl)-8-(10- n -butyl-10 H -phenothiazine-3-yl)BODIPY (avyl-BODIPY-PTZ) with a special orthogonal donor-acceptor structure was designed and synthesized for rapid, sensitive, and selective discrimination of ClO − , over other reactive oxygen species and anions. The probe displays a linear ratiometric absorption (A 578 /A 640 ) and fluorescence (F 599 /F 660 ) response toward ClO − with a fast response velocity (~10 s). The limit of detection (LOD) for ClO − was obtained as 22.6 nM from the fluorescence titration experiment. The fluorescence enhancement of the probe can be observed from the 32-fold enhancement in ratiometric value (F 599 /F 660 ) and the increasement of quantum yield from 0.01 at 660 nm to 0.28 at 599 nm. The oxidation of S atom in phenothiazine by ClO − to form the sulfoxide-type structure was proposed as the recognizing mechanism according to the Mass spectral analysis. The ratiometric enhancement of fluorescence was rationalized by the theoretical calculations. The orthogonal donor-acceptor structure according to optimized calculation and solvent effects of avyl-BODIPY-PTZ illustrated that the ClO − oxidation induced conversion from the nonradiative TICT process to the radiative LE process and caused the fluorescence ratiometric enhancement. The probe with low cytotoxity can successfully permeate into living cells and the cell images can be achieved in single channel. Moreover, after addition of ClO − , another bright red emission channel of the probe switched on and the probe displayed two-channel emission in living cells.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Lujia Ding,Pengcheng Wang,Qiuhan Lin,Dongxue Li,Yuangang Xu,Ming Lu
Fused cyclic energetic compounds are a unique class of large conjugated structures containing two or more rings, and have been identified as promising competitors for traditional energetic materials. In the present work, we investigated 5-amino-6-oxo-4,6-dihydro-[1,2,5]oxadiazolo[3′,4′:5,6]pyrido[4,3- d ][1,2,3]triazine 8-oxide ( 3 ) in detail as a fused amphoteric energetic molecule that can be protonated and deprotonated by acids and bases to obtain its cationic ( 11 – 13 ) and anionic ( 4 – 10 ) salts. All the new compounds were thoroughly characterized by infrared and multinuclear NMR ( 1 H and 13 C) spectroscopy, and elemental analysis. The structural features of 3 – 6 , 9 , 10 , 12 , and 13 were investigated by single-crystal X-ray diffractions and different theoretical techniques (Hirshfeld surfaces analyses, and noncovalent interactions). The aromaticity of compound 3 was studied via localized orbital locator- π and iso -chemical shielding surfaces (ICSS). Their thermal decomposition temperatures were investigated by differential scanning calorimetry and thermogravimetry to be 310–344 °C (onset). In addition, impact and friction tests revealed that these compounds were insensitive. Densities, heats of formation and detonation properties were measured by a gas pycnometer, calculated using the Born-Haber energy cycle and EXPLO5 v6.05.04 program, respectively. The neutral compound 3 and all its non-metallic salts have better detonation properties than HNS and PYX and lower sensitivities. In particular, salt 11 (N + O: 61.74 %, T d : 330 °C, Δ H f : 1.68 kJ g −1 , D : 8.795 km s −1 , P : 36.0 GPa, IS: > 40 J, FS: > 360 N) is a potential candidate for heat-resistant explosives.
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HOLZFORSCHUNG
·
2023
·Vol. 77
·期 6
·437-452
·
IF 2.4
Haonan Zhang,Qi Liu,Yanchen Zhu,Zhang Feng,Hao Ren,Huamin Zhai
In this study, representative lignin samples differing in hydroxyl content, molecular weight, linkage composition and lignin units ratio were prepared from eucalyptus wood by different isolation means and modification means: milled wood lignin (MWL), kraft lignin classified at different pH (KL), lignocresol (LC), lignoresorcinol (LR), lignopyrogallol (LP) as well as lignocresol secondary functional switched samples (LC 2 nd deriv). The structure of various lignins was characterized in detail by Fourier transform infrared (FT-IR) spectroscopy, gel permeation chromatography (GPC) and nuclear magnetic resonance (NMR). In order to eliminate the interference of other factors, bovine serum albumin (BSA) with relatively simple protein structure and different kinds of lignin and their derivatives were selected as the research objects. The adsorption/desorption behavior and mechanism between lignin samples and BSA were studied by quartz crystal microbalance with dissipation monitoring (QCM-D). The results showed that the content of phenolic hydroxyl was the main factor affecting the interaction of lignin and BSA, but in addition, the molecular size, linkages composition and the types of lignin units also had important effects on its adsorption behavior. The research will provide theoretical guidance and all-round reliable basic data for the interaction of lignin on lignocellulose hydrolysis enzymes in industrial application.
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International Journal of Nanomedicine
·
2017
·
IF 4.3
Jifu Hao,Tiantian Tong,Kai Jin,Qiannan Zhuang,Te Han,Yanping Bi,Jianzhu Wang,Xiaodan Wang
A folic acid (FA)-functionalized drug vehicle platform based on Pluronic 127 (P127)/D-α-tocopheryl polyethylene glycol 1000 succinate (TPGS) mixed micelles was orchestrated for an effective delivery of the model drug resveratrol in order to address the problem of poor water solubility and rapid metabolism of resveratrol and improve its targeted accumulation at tumor site. The FA-decorated mixed micelles were prepared using thin-film hydration method and optimized by central composite design approach. The micelles were also characterized in terms of size and morphology, drug entrapment efficiency and in vitro release profile. In addition, the cytotoxicity and cell uptake of the micelles were evaluated in folate receptor-overexpressing MCF-7 cell line. In vivo pharmacokinetic and biodistribution studies were also performed. The average size of the micelles was ~20 nm with a spherical shape and high encapsulation efficiency (99.67%). The results of fluorescence microscopy confirmed the targeting capability of FA-conjugated micelles in MCF-7 cells. FA-modified micelles exhibited superior pharmacokinetics in comparison with that of solution. Further, the low accumulation of resveratrol-loaded FA micelles formulation in the heart and kidney avoided toxicity of these vital organs. It could be concluded that folate-modified P127/TPGS mixed micelles might serve as a potential delivery platform for resveratrol.
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DOI
PubMed
高影响因子
FOOD CHEMISTRY
·
2020
·
IF 6.306
Hang Yu,Qili Zhong,Yunfei Xie,Yahui Guo,Yuliang Cheng,Weirong Yao
A kinetic model for Maillard reaction (MR) model system of d -glucose and l -lysine was established; activation energy ( Ea ) of each step was calculated. Potential generation pathways of furosine and pyrraline were a combination of either 3-deoxyglucosone (3-DG) or methylglyoxal (MG) with l -lysine. Ea value for furosine generated through 3-DG pathway was 81.70 ± 14.01 kJ mol −1 , which was significantly higher than that through MG pathway (52.08 ± 4.48 kJ mol −1 ). As for pyrraline, Ea for the 3-DG pathway (53.45 ± 4.02 kJ mol −1 ) was significantly lower than that through the MG pathway (110.22 ± 18.77 kJ mol −1 ). Results of the kinetic study indicated that furosine was preferred to be generated through the MG pathway since MG is more likely to react with each other and form a furan ring as a precursor of furosine. Pyrraline was more easily to be generated from the 3-DG pathway through cyclization of 1,4-dicarbonyl compounds to pyrrole.
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PubMed
高影响因子
Advanced Science
·
2025
·
IF 14.1
Yue Chen,Xunheng Jiang,Zhiyu Pan,Zhenjie Li,Chaohuang Chen,Can Li,Chenghui Luo,Shengkun Zhang,Daohui Lin,Xinhua Xu,Jiang Xu
Nonradicals relying on peroxymonosulfate (PMS) activation face inherent kinetic and thermodynamic limitations in pollutant mineralization. This is overcome using asymmetric iron single-atom catalysts (Fe-SACs) with Sabatier-adjusted d -band centers that establish a synergistic nonradical network of pathways, achieving exceptional mineralization (≈85%) with only one-tenth conventional PMS dosage. Direct coordination of high-loading Fe (≈10 wt.%) with controllable p -block elements (S, P, B) simultaneously facilitates electron-transfer pathways and selective generation of nonradicals ( 1 O 2 , Fe IV = O). Compared to symmetric Fe 1 -N 4 , they enhance pollutant removal and mineralization by 4.2-fold and 6.3-fold, respectively. Atomic-resolution characterization and theory reveal that the dopant's electronegativity governs the electronic perturbations of the Fe center, dictating PMS adsorption. Pollutant-specific charge transfer and adsorption affinity critically determine nonradical activity. The asymmetric Fe SACs exhibit excellent stability and applicability in complex matrices and continuous-flow wastewater treatment. This work provides a transformative strategy to overcome fundamental limitations in advanced oxidation processes and a design framework for sustainable environmental technologies.
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产品关联
DOI
PubMed
高影响因子
Foods
·
2025
·Vol. 14
·期 9
·1648
·
IF 5.1
Feng Yang,Xin Qi,Yan Chen,Kai Tang,Mengyang Fang,Yanwei Song,Jiufen Liu,Lianming Zhang
In this study, β-cyclodextrin (β-CD) functionalized graphene quantum dots (GQDs) was employed to augment the array of chiral recognition sites, thereby enhancing the affinity of GQDs/β-CD composite for imprinting molecules and realizing heightened chiral selectivity. The incorporation of GQDs/β-CD into the synthesis of molecularly imprinted polymers (MIPs), synergizing with the host-guest inclusion properties of β-CD and the abundant carboxyl groups of GQDs, enhanced the chiral recognition capacity of MIPs materials. Consequently, a novel MIPs/(GQDs/β-CD) sensor with chiral recognition capabilities tailored for D-carnitine was successfully fabricated. The binding mechanism between GQDs/β-CD and D-carnitine was elucidated via Ultraviolet-visible spectroscopy and Fourier transform infrared spectroscopy. The variation in the response signal (ΔI) of the probe molecule exhibited a linear correlation with the logarithm of D-carnitine concentration (lgC) in the range of 1.0 × 10−12mol/L to 1.0 × 10−9mol/L, and the detection limit (3δ/S) was calculated as 2.35 × 10−13mol/L. These results underscore a 7.15-fold enhancement in the selectivity of MIPs/(GQDs/β-CD) sensor for D-carnitine recognition. Moreover, the sensor presented commendable efficacy in real-world scenarios, yielding recovery rates ranging from 98.5% to 103.0% during the determination of D-carnitine content in real samples.
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产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2019
·
IF 3.131
Mingwei Zhao,Mengjiao Cao,Yong Hu,Qianru Yang,Yining Wu,Zhongzhong Chu,Xuewen Hu,Caili Dai
Polymer as non-Newtonian fluids is widely used in oilfield flooding for enhanced oil recovery (EOR). The study on the oil droplet behaviors in polymer solution has a remarkable influence for clarifying the EOR mechanism of polymer flooding. In this paper, factors influencing the oil droplet breakup process, including polymer concentration, pore throat structure, elasticity as well as flow rate, were investigated. It was found that the oil droplets were liable to breakup and the average size of daughter droplet decreased by about a quarter as the polymer concentration increased (from 0.01% to 0.5%). A prediction model for the effect of polymer concentration on the length of the first daughter droplet was established. Furthermore, the relationship between polymer concentration and the length of the first daughter droplet was fitted to an exponential function. After excluding the influence of viscosity, it was found that the elastic property of polymer fluid made the oil droplets more likely to breakup when passing through pore throat.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Qianqian Song,Junqi Li,Beiyi Zhang,Hu Li,Xiaoxu Liu
Despite the challenges on tuning the d-band structure of transition metals , the d-band is of great importance for promoting the interaction between catalytic and intermediates during the oxygen evolution reaction (OER) process. Herein, ultrafine Co nanoparticles embedded in the surface layer of nitrogen-doped carbon microspheres are prepared through an in-situ co-coordination strategy, and its d-band is modulated by introducing different Ni amounts. The introduction of Ni in the Co crystal lattice can tune the d-band center and unpaired electrons, which collectively result in an enhancement of OER activity and kinetics. By investigating the catalysts with Ni content from 0% to 75%, it is concluded that the catalyst with 25% Ni shows optimal OER activity, lower overpotential (285 mV at 10 mA cm −2 ) and higher current densities (73.75 mA cm −2 at 1.63 V). Moreover, the good stability is also demonstrated with the negligible decrease on current densities after 3000 CV cycles or 100 h of continuous test in alkaline media. This concept of modulating the d-band structure by introducing a transition metal with different contents in another transition metal crystal lattice could present an alternative pathway to the development of highly active catalytic materials for OER and beyond.
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