LETTERS IN ORGANIC CHEMISTRY
·
2025
·Vol. 23
·期 1
·24-34
·
IF 1
Yuanbin Wu,Yuting Zhang,Shunyan Wang,Meihui Chen,Donghong Xie,Huihua Gong,Zhenye Wang,Yue Yu,Mingguang Zhu,Yaohui You
α-Cyanostilbene, as a key Aggregation-Induced Emission (AIE) fluorophore, has garnered considerable attention in the fields of biology, chemistry, and materials science for diverse applications. Herein, α-cyanostilbene luminogen with π-electron acceptor-π-electron donor (π-A-π-D) architecture was easily synthesized in a high yield of 86% via Knoevenagel condensation of 4-aminophenylacetonitrile and benzaldehyde in the presence of NaOH. The relationship between the structure and photophysical properties was studied via spectroscopic analysis and Density Functional Theory (DFT) calculations. Interestingly, it demonstrated the solvatochromism in the solution state. With an increasing polarity of the solvent, the Stokes shift was increased, and a significant change in fluorescence from blue to green was observed; however the fluorescence emission intensity decayed due to the Twisted Intramolecular Charge Transfer (TICT) effect. Moreover, it expressed solid green fluorescence and underwent noticeable acidichromism. The periodic HCl/NH3 vapor stimulated changes in fluorescence from green to faint yellow, suggesting that it could be utilized for reusable encryption technology. Furthermore, it displayed apparent fluorescence quenching upon the addition of different amounts of water in hygroscopic organic solvents. The Limits Of Detection (LODs) of it in THF, MeCN, EtOH, and DMF for water detection were 0.0023%, 0.0018%, 0.0015%, and 0.003%, respectively.
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DALTON TRANSACTIONS
·
2026
·
IF 3.3
Xing-Yu Bi,Yuting Gao,Chenyuan Ma,Zhi Fang,Mei-Hong Duan
Designing birefringent crystals with wide band gap presents significant challenges, especially within chalcogenide systems. Herein, motivated by the high structural anisotropy of thiourea, along with the ultraviolet compatibility and birefringence activity of halogenated tin(II)-based anionic groups, SnCl2[SC(NH2)2], a novel molecular crystal, was discovered. SnCl2[SC(NH2)2] was characterized by a bench-shaped molecule structure which is formed by the sharing of sulfur anion between a distorted SnCl2S trigonal pyramid and a planar π-conjugated thiourea unit. Through the synergistic interactions among multiple functional groups and the auxiliary regulation of hydrogen bonds, SnCl2[SC(NH2)2] succeeded in breaking the “3 eV wall” with a band gap of 3.362 eV and achieved a large birefringence of 0.20@546 nm, demonstrating a facile design strategy for the development of chalcogenides with dual optical enhancement.
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Scientific Reports
·
2017
·Vol. 7
·期 1
·7448
·
IF 4.259
Han Lina,Li Qinglian,Chen Shuai,Xie Wei,Bao Weiren,Chang Liping,Wang Jiancheng
A sort of magnetical material named Fe 3 O 4 –NH 2 –Pd was prepared by loading varying amounts of immobilizing Pd on the surface of the magnetic Fe 3 O 4 –NH 2 microspheres. This magnetical material was used firstly for capturing Hg° from coal derived fuel gas based on its recoverability. The experimental results showed that the loading Pd on the amine-functionalized magnetite nanoparticles can greatly improve the efficiency of removing Hg° at a high temperature range between 200 and 300 °C. The magnetic Fe 3 O 4 –NH 2 –Pd sorbent with 5% Pd loaded exhibited significantly high activity and stability in capturing Hg°, affording over 93% capture efficiency at 200 °C for more than 8 hrs. Compared to the Fe 3 O 4 –NH 2 sorbent that converted the Hg° as HgS, this Fe 3 O 4 –NH 2 –Pd sorbent can remove the Hg° by forming Pd-Hg amalgam and HgS. In addition, the experimental tests indicated that the as-synthesized Fe 3 O 4 –NH 2 –Pd sorbent still showed stable magnetic properties after two regeneration cycles in removing Hg°, which provided the opportunity for preparing a recyclable sorbent which can be easily separated and recovered for Hg° removal.
研究领域:
环境科学
·
材料化学
·
能源工程
·
污染控制
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ANALYST
·
2022
·Vol. 147
·期 24
·5655-5662
·
IF 5.227
Ying Zhou,Ruichun Li,Guomei Zhang,Yan Zhang,Caihong Zhang,Shaomin Shuang
Metal–organic frameworks (MOFs) have emerged as interesting nanomaterials owing to their large surface area, high porosity, tunable pore architecture and easy functionalization. However, an inferior electrical conductivity hinders their application in electrochemical sensing. In this paper, gold–palladium alloy/UiO-66-NH2/graphene (AuPd/UiO-66-NH2/GN) composites were synthesized by loading alloys on the surfaces of MOFs and then attaching them to the graphene surface. The addition of metal nanoparticles and graphene enhanced the electron transfer ability of MOFs. Then, composites were used to modify a glassy carbon electrode (GCE) to construct a sensitive dopamine (DA) electrochemical sensor. The developed sensor manifested two linear relationships in lower concentration ranges and in higher concentration ranges with a 0.21 × 10−6 mol L−1 low detection limit (3σ/k) under optimal conditions. The results certified that the constructed sensor had high selectivity, excellent reproducibility and good stability, and had been used successfully for DA detection in actual human serum samples.
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TALANTA
·
2022
·
IF 6.556
Pengfei Zhao,Sisi Tang,Xiaodan Wu,Yu Chen,Kangling Tang,Jinli Fu,Huibin Lei,ZhaoXia Yang,Zhaohui Zhang
Development of method with micro-volume reagent usage and high selectivity for rapid determination of valuable disease-related biomarkers is of great importance for disease surveillance. Herein, a novel ratiometric fluorescence capillary imprinted sensor was developed for highly selective fluorescence determination of sialic acid (SA) based on luminescent metal-organic framework (UiO-66-NH 2 ). In this strategy, the imprinted pre-polymer with double emissions was sucked into the capillary to grow imprinted layer on the inner wall of the capillary. In presence of SA, the blue fluorescence (440 nm) served as fluorescence response signal was quenched due to the electron transfer mechanism between metal organic framework and SA while the red fluorescence (655 nm) served as the reference signal was remained. Within SA concentration linear range of 1.0 × 10 −7 –3.0 × 10 −4 M, the ratiometric fluorescence capillary imprinted sensor was applied to detect SA in human serum and saliva samples successfully with a detection limit of 2.5 × 10 −8 M. A sensitive and selective fluorescence method with micro-volume sample consumption (15 μl) for determination of SA in practical samples was established.
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CHIRALITY
·
2022
·Vol. 34
·期 3
·462-472
·
IF 2.183
Zhen Wang,Wan-Qi Xiong,Zhi-Feng Huang,Gai-Zhao Qin,Min Zi,Li-Ming Yuan
Chiral covalent organic framework materials have many excellent properties, which have received much attention in the field of separation. Synthesized the covalent organic framework COF-TpBD (NH 2 ) 2 modified, respectively, by L-valine trifluoroacetyl derivative, L-hydroxyproline, and (1S)-(+)-10-camphorsulfonyl chloride, three capillary columns of chiral covalent organic framework materials were obtained for gas chromatography. Those columns are able to separate some chiral compounds, positional isomers, n-alkanes, n-alcohols, aromatic hydrocarbon mixture, and Grob's reagents. They are complementary to other chiral capillary columns and are possible for potential applications.
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NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 17
·8203-8214
·
IF 3.925
Lingli Zhang,Han Tao,Chun Ji,Qiaoling Wu,Xiao Wang,Yuangeng Wu
As an alternative to bisphenol A (BPA), bisphenol S (BPS) is widely used in many consumer goods and industrial products. However, BPS has similar genotoxic, reproductive and endocrine disrupting effects to BPA and can enter the body through the food chain or by dermal absorption to endanger human health. This paper presents a rapid and direct electrochemical sensing technique for ultra-trace BPS determination on the basis of the signal amplification of the 1T phase & 2H phase hybrid MoS2 nanosheets (1T&2H-MoS2) and amino-functionalized carbon nanotube (CNTs-NH2) composites. The cooperative electrocatalytic effect and high-electrically active surface area of 1T&2H-MoS2/CNTs-NH2 composites not only facilitated the electron transfer between BPS and the electrode, but also promoted the adsorption of BPS on the electrode. Hence, the 1T&2H-MoS2/CNTs-NH2 modified electrode exhibited excellent electrocatalytic activity with a lower oxidation potential and higher peak current for BPS. Under the optimized conditions, the peak current response of BPS showed a good dose-dependent relationship with its concentration in the range of 0.02–1.0 μM and 1.0–70.0 μM, while the detection limit was as low as 8.6 nM. The proposed method was used to determine BPS in the mineral water bottle and orange juice samples with satisfactory spiked recoveries between 92.31% and 104.20%, demonstrating its reliability and practicality in real sample analysis. Furthermore, the sensing method has the characteristics of facile electrode fabrication, fast response (<4 min) and good reproducibility.
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Environmental Science-Nano
·
2022
·Vol. 9
·期 8
·3081-3093
·
IF 9.473
Yuqi Wan,Huaizhi Yang,Qigao Shang,Qingrong Cheng,Hong Zhou,Zhiquan Pan
A novel metal–organic framework@covalent organic framework (MOF@COF) heterojunction was synthesized based on post-synthetic covalent modification. In the present work, aldehyde-modified MOFs (NH2–MIL-101(Fe)) were covalently bonded with covalent organic frameworks (Schiff base network-1, SNW-1) forming the NH2–MIL-101(Fe)@SNW-1 (MS-x) heterojunction by using this strategy. The MS-x heterojunction showed excellent photodegradation ability for pollutants and photocatalytic hydrogen production under simulated sunlight. The superior photocatalytic performance of the MS-x heterojunction can be attributed to the formation of –CN– bonds between NH2–MIL-101(Fe) and SNW-1, which enhances the charge separation efficiency and improves the stability of the photocatalyst. It is worth mentioning that SNW-1 on the surface of the catalyst had a hollow structure which can promote the photoelectric charge migration. Furthermore, the results verified that the matched band structure of NH2–MIL-101(Fe) and SNW-1 could induce a type II heterojunction, which could well explain the improved photocatalytic performance of the photocatalytic system. This work not only provides a new idea to construct highly efficient and stable MOF@COF heterojunctions but also broadens the applications of COF-based materials.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2021
·
IF 3.764
Ju Liu,Dandan Hao,Huiwen Sun,Yu Li,Jianlin Han,Bo Fu,Jiancheng Zhou
In this Article, a hybrid foam was fabricated through the integration of amine-functionalized Fe-MOF (MIL-101-NH2) into cellulosic matrix. The existence of enormous group linkages and ionic bonding interactions among the composite foam network leads to a uniform dispersion of MIL-101-NH2 and high affinity between the MOF and cellulose skeleton. As-prepared hybrid foams were utilized as photocatalysts to reduce toxic hexavalent chromium ions (Cr(VI)) under visible light. Optimal performance was observed over CM-1 (with a MIL-101-NH2 and nanocellulose mass ratio of 1:1). When compared to pure MOF nanoparticle counterparts, the CM-1 foam presented preferable and more efficient Cr(VI) removal performance. The reasons could be attributed to the hierarchal pore structure and uniform MOF loading. Moreover, the flexible foams could be easily separated from the solution and preserved more than 80% removal efficiency of Cr(VI) after 10 runs. This work would shed light on how to construct high-efficiency photocatalysts for environmental governance from sustainable materials.
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Catalysis Science & Technology
·
2021
·Vol. 11
·期 19
·6507-6515
·
IF 6.119
PanPan Xu,Liuxue Zhang,Xu Jia,Hao Wen,Xiulian Wang,Suqing Yang,Juxian Hui
Compared to the current commercial three-step production process involving low phenol yield, low atomic efficiency, and the formation of explosive intermediates, the direct oxidation of aromatic hydrocarbon to more desirable and important chemical industry intermediate such as phenol offers a more attractive and challenging pathway. Here, we report the selective photocatalytic hydroxylation of benzene to phenol using NH2-MIL-88/PMo10V2-3 as the catalyst and H2O2 as a mild oxidant. Heteropoly acid (PMo10V2) was immobilized to metal–organic frameworks (NH2-MIL-88), where PA anions play an essential role in anchoring NH3+ cations to form stable heterogeneous photocatalysts. The reaction offered a high selectivity of 99% with a yield of 24% for phenol under optimum reaction conditions. Comprehensive characterizations and experiments disclosed a multistep reaction mechanism in which high dispersion of PMo10V2, the production of hydroxyl radical(˙OH) and the formation of V5+/V4+ redox pairs are responsible for the activity of the reaction in the presence of electrons (e−). The recycling experiments were essential in confirming the reusability of the catalyst, and FT-IR characterization analysis also proved the integrity of NH2-MIL-88/PMo10V2-3 after three cycles. This work provides potential applications in the green and highly efficient photocatalytic synthesis of other organic compounds and other environmental applications.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Guanglai Mo,Linxi Wang,Jianhong Luo
It is a challenge to achieve efficient photocatalytic activity of pure MOFs. Herein, the defective NH 2 -MIL-125(Ti) with adjustable linker vacancy level was successfully created by thermal treatment. The band gaps of samples decreased and the more Ti-O clusters on the surface of the samples can be achieved as the time of thermal treatment increased from 0 to 500 min, both of which facilitated the photocatalytic activity for the reduction of Cr(VI). Moreover, the ligands from the surface to the inside of the samples were successively decarboxylated, resulting in the declined specific surface area and the increased proportion of mesoporous and the defect level. The moderate defect level in NH 2 -MIL-125(Ti) can be obtained as the time of thermal treatment was 300 min, which facilitated the separation of photogenerated charges, contributing to the highest photocatalytic activity for reduction of Cr(VI), which was 9.2 times than that of the initial MOFs. However, the excessive linker vacancy defect level in NH 2 -MIL-125(Ti) may result in the seriously affected crystal structure and the retarded separation of photogenerated charges.
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RSC Advances
·
2021
·Vol. 11
·期 62
·38982-38989
·
IF 3.361
Zang Chuanfeng,Han Xiangye,Dong Erying,Shen Feiyu,Yan Tingting,Wang Runyue,Zhang GuangyuYu
A new type of nanofiber membrane was prepared by mixed electrospinning of cellulose diacetate and amino-terminated hyperbranched polymer (HBP-NH2), and glutaraldehyde (GA) crosslinking was used to improve its water resistance and shape retention. pH, adsorption time, and initial solution concentration on Cu(II) and Cr(VI) ions were studied. Results showed that the prepared GA-CDA/HBP-NH2 nanofiber had good spinning uniformity, hydrophilicity, and adsorption effect on Cu(II) and Cr(VI) ions compared with the pure CDA nanofiber. The maximum adsorption capacity of GA-CDA/HBP-NH2 for Cu(II) and Cr(VI) was 50.2 and 176.6 mg g−1, respectively.
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