SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2022
·
IF 4.831
Brian Musikavanhu,Dongwei Zhu,Mengran Tang,Zhaoli Xue,Shengjun Wang,Long Zhao
Naphthol hydrazone derivatives are recognized as efficient chelating agents for both qualitative and quantitative detection of metal ions. Here we design a naphthol hydrazine-based chemosensor with covalently linking a strong electron-withdrawing benzothiadiazole group to modulate the molecular electronic structure, nominated as NtHzBtd . The fluorescent probe performs excellent selectivity and sensitivity towards Fe 3+ with 1:1 binding stoichiometry, while exhibiting a quick response at 55 s with a relatively low limit of detection of 0.036 µM. A series of spectroscopic measurements in tandem with theoretical calculations suggest that the probe undergoes both intramolecular charge transfer (ICT) and chelation enhanced quenching (CHEQ) processes. Successful color rendering of paper strips and bioimaging in PC3 cells demonstrate the promising applicability of NtHzBtd for portable Fe 3+ detection in real samples and biosystems.
研究领域:
分析化学
·
生物医学
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产品关联
DOI
PubMed
高影响因子
CRYSTAL GROWTH & DESIGN
·
2019
·
IF 4.153
Yue Yuan,Duanxiu Li,Chenguang Wang,Shaodong Chen,Minmin Kong,Zongwu Deng,Changquan Calvin Sun,Hailu Zhang
Sulfamethizole (SMZ) is an antibiotic drug with good solubility but short in vivo half-life. Thus, reducing the dissolution rate is expected to improve bioavailability and therapeutic activity through reducing the systemic elimination of SMZ. To this end, two novel pharmaceutical cocrystals, SMZ–sarcosine (SMZ–SAR) and SMZ–saccharin (SMZ–SAC), were designed and prepared according to the structural resemblance strategy. These cocrystals, along with a previously obtained SMZ–l-proline (SMZ–l-PRO) cocrystal, present an opportunity for detailed analysis of the crystal structure to identify key intermolecular interactions that guide their molecular assembly. 13C Solid state NMR data suggested more than one symmetry independent molecules in SMZ (Z′ > 1), which was confirmed by the SMZ crystal structure solved at 100 K (Z′ = 3). The amine–carboxylate synthon plays an important role in the intermolecular hydrogen bonding interactions of both SMZ–SAR and SMZ–l-PRO. In contrast, no strong intermolecular hydrogen bonding and π···π stacking interactions between SMZ and SAC were observed in SMZ–SAC, which features a shape-fit structure. Additionally, all cocrystals demonstrated lower equilibrium solubility and intrinsic dissolution rates compared to SMZ. Therefore, they are suitable crystal forms for the possible improvement in therapeutic performance of SMZ.
研究领域:
药学
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晶体学
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药物化学
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产品关联
DOI
高影响因子
JOURNAL OF FLUORESCENCE
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2022
·Vol. 32
·期 6
·2077-2086
·
IF 2.525
Yu Bo,Yuan Ruimin,He Tianzhi,Liang Lijuan,Huang Kun
The development of mercury ion selective fluorescent probe is significant because it is one of toxic heavy metals and poses great risks and hazards to human health. Herein, we develop a mercury ion-selective fluorescent probe, namely IB , based on imidazole decorated benzothiadiazole that obtained by a facile palladium catalytic C-N coupling reaction. IB exhibits high selectivity and sensitivity towards mercury ion in water with nearly 32-fold fluorescent enhancement. The detection limit is calculated to be 0.93 nmol/L. In addition, the sensing of mercury ion can be conducted in a wide pH scope ranging from 4.0 to 10.0. Subsequently, the mercury ion elicits fluorescence of IB solution can be quenched by the addition of cyanide anions, showing “off-on-off” fluorescence transformation with at least 5 cycles, demonstrating the reversible sensing ability of IB . Furthermore, an INHIBIT logical detector has been developed using mercury ion and cyanide anions as inputs and fluorescence of IB as output. Significantly, IB can be utilized for mercury ion detection in real water sample.
研究领域:
化学
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环境科学
·
分析化学
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DOI
PubMed
高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2014
·Vol. 32
·期 3
·292-304
·
IF 1.42
Li Zhi-min,Zhang Gang,Li Dong-sheng,Yang Jie
Highly refractive and transparent polyamides containing thiadiazole units have been developed. These polymers were prepared by a polycondensation reaction of 4,4′-(1,3,4-thiadiazole-2,5-thio) bis(methylene) dibenzoyl chloride (TDTBM-DC) and diamine which contained thioether (-S-) and sulfone units. They showed good thermal stabilities such as a relatively high glass transition temperature of 206–233 °C and a 5% weight-loss temperature ( T
5% ) of 376–395 °C. The optical transmittance of the polymer at 450 nm is higher than 83%. The heterocycle units and plural -S- linkages provide the polymer with a high refractive index of 1.716–1.725 at 633 nm and a low birefringence of 0.003–0.004. Also they showed improved solubility in polar aprotic solvents and could form moderate strength films with tensile strength of 72.8–83.1 MPa and storage modulus of 1.0–1.8 GPa (at 200 °C).
研究领域:
材料科学
·
高分子化学
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产品关联
DOI
高影响因子
TALANTA
·
2020
·
IF 5.339
Lingling Li,Yang Li,Yijing Dang,Tingting Chen,Ao Zhang,Chunyong Ding,Zhiai Xu
Intracellular pH is a key physiological factor for controlling the activities and functions of cells and lysosome is a vital subcellular organelle. Thus, developing a novel lysosome-targeting fluorescence probe for selective and sensitive detection of lysosomal pH in living cells is very important. In this work, we synthesized a series of fluorescence probes based on imidazole-fused benzothiadiazole . The optical properties of these probes were easily adjusted by modifying the substituents with different electron-withdrawing/donating ability in imidazole moiety. All of them showed acid-response and decreased fluorescence intensity during pH values changing from 4.0 to 8.5. The introduction of morpholine group allowed them to specifically respond to the changes of lysosomal pH. Among them, probe MIBTAA possessed a suitable p K a value (5.3) and showed good linear response to pH (R 2 = 0.9918) with red emission when pH changed from 4.4 to 5.6. The probe was successfully applied for monitoring pH variation in living cells induced by proton-pump inhibitor Baf-A1 and chloroquine , indicating its great potential for pH imaging in biological applications.
研究领域:
生物化学
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细胞生物学
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医学影像学
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产品关联
DOI
PubMed
高影响因子
Polymer Chemistry
·
2018
·Vol. 9
·期 35
·4468-4475
·
IF 4.927
Chang Cheng,Xunchang Wang,Yaoyao Lin,Luying He,Jia-Xing Jiang,Yunfeng Xu,Feng Wang
The development of highly efficient organic photocatalysts for water splitting into hydrogen is one of the key challenges in materials chemistry. Herein, we have designed and synthesized a series of conjugated polymers with either a one- or three-dimensional framework consisting of pyrene and benzothiadiazole with different numbers of fluorine substitutions (0 or 2). The effect of molecular structure and fluorine substitution on their catalytic activity was investigated. It was found that the linear non-fluorinated polymer L-PyBT exhibited the highest hydrogen evolution rate up to 83.7 μmol h−1 under visible light irradiation among the prepared polymers because of its broad light absorption, suitable energy bandgap, and enhanced charge generation and separation process.
研究领域:
材料化学
·
光催化
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能源材料
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高分子化学
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光功能材料
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DOI
高影响因子
ECS Journal of Solid State Science and Technology
·
2021
·Vol. 10
·期 7
·076003
·
IF 2.07
Bin Hu
A novel monomer of 4-(4H-dithieno[3,2-b:2',3'-d]pyrrol-4-yl)-N,N-dimethylaniline (TPDA) based on pyrrole and thiophene units was designed and synthesized, with the homopolymer and copolymer with 4,7-di(2,3-dihydro-thieno[3,4-b][1,4]dioxin-5-yl)benzo[1,2,5]thiadiazole (BDT) prepared by an electrochemical method. Both polymers exhibited good electrochemical properties. Spectroelectrochemical features were investigated using an electrochemical station and UV–vis spectrophotometer. PTPDA film showed orange color in the neutral state and blue color for the oxidation state while PBDT film exhibits a neutral green color and light blue for the oxidation state. The copolymer film can cover the entire visible region due to its possessing the absorption features of both PTPDA and PBDT films, which exhibits black color in the neutral state (0 V) and blue color in the oxidation state (1.0 V). In addition, both the homopolymer and copolymer exhibit good electrochemical stability and coloration efficiency. These electrochromic properties make them as potential candidates for applications.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2016
·
IF 4.836
Wenwen Gong,Xinhui Liu,Shuhua Xia,Baocui Liang,Wei Zhang
Dinitroaniline herbicides such as trifluralin and pendimethalin are persistent bioaccumulative toxins to aquatic organisms. Thus, in-situ remediation of contaminated sediments is desired. This study investigated whether black carbons (BCs), including apple wood charcoal (BC1), rice straw biochar (BC2), and activated carbon (BC3), could facilitate abiotic reduction of trifluralin and pendimethalin by sulfides of environmentally-relevant concentrations in anoxic coastal sediments. The reduction rates of trifluralin and pendimethalin increased substantially with increasing BC dosages in the sediments. This enhancing effect was dependent on BC type with the greatest for BC3 followed by BC1 and BC2, which well correlated with their specific surface area. The pseudo-first order reduction rate constants ( k obs ) for BC3-amended sediment (2%) were 13- and 14 times the rate constants in the BC-free sediment. The reduction rates increased with increasing temperature from 8 to 25 °C in the BC-amended sediment, following the Arrhenius relationship. Finally, through molecular modeling by density functional theory and reaction species identification from mass spectra, molecular pathways of trifluralin and pendimethalin reduction were elucidated. In contrary to the separate sequential reduction of each nitro group to amine group, both nitro groups, first reduced to nitroso, then eventually to amine groups.
研究领域:
环境科学
·
化学
✓ 已验证
DOI
PubMed
高影响因子
Science China-Chemistry
·
2024
·
IF 10.4
Li Jiangao,Niu Niu,Wang Deliang,Liu Xue,Qin Yi,Wang Lei,Tang Ben Zhong,Wang Dong
Exploration of single molecular species synchronously featured by long excitation/emission wavelength, accurate diagnosis, and effective therapy, remains supremely appealing to implement high-performance cancer phototheranostics. However, those previously established phototheranostic agents are undiversified and stereotyped in terms of structural skeleton, and generally exhibit insufficient phototheranostic outcomes. Herein, we innovatively utilized indanone-condensed thiadiazolo[3,4-g]quinoxaline (ITQ) as electron acceptor to construct novel photosensitizer with second near-infrared (NIR-II) emission. Experimental study and theoretical calculation demonstrated that comparing with the counterparts constituting by widely employed NIR-II building block benzobisthiadiazole (BBTD) and 6,7-diphenylthiadiazoloquinoxaline (DPTQ), ITQ-based photosensitizer (TITQ) showed superior aggregation-induced emission (AIE) characteristics, much stronger type-I reactive oxygen species (ROS) production, and prominent photothermal conversion capacity. Furthermore, TITQ nanoparticles with excellent biocompatibility were capable of effectively accumulating in the tumor site and visualizing tumor through fluorescence-photoacoustic-photothermal trimodal imaging with highly spatiotemporal resolution, and completely eliminating tumor by type-I photodynamic-photothermal therapy.
研究领域:
癌症研究
·
光疗
·
纳米医学
·
生物医学工程
·
分子成像
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DOI
高影响因子
ORGANIC ELECTRONICS
·
2018
·
IF 3.68
Zhen Xu,Hongmei Du,Mengjie Yin,Bozhen Wang,Jinsheng Zhao,Yu Xie
4,7-Bis(4-hexyl-5-(trimethylstannane) -2-thienyl) −2,1,3-benzothiadiazole (HTBT) coupled with 2,5-bis (decyloxy)-1,4-dibromobenzene to afford the donor-π-bridge-donor-acceptor conjugated poly (4,7-bis (4-hexyl-2-thienyl) −2,1,3-benzothiadiazole-co-p-didecyloxybenzene) (PTBTB). Further, copolymerization of fluorine-functionalized HTBT moiety with alkoxyl benzene π-bridge using Stille crossing-coupling reaction yield PTBTB-F. The optical, electrochemical, fluorescent, spectroelectrochemical and electrochromic switching properties of two polymers with different acceptors are studied in detail. Both polymers exhibit excellent solubility in conventional organic solvents , high thermal stability and favorable fluorescence properties. The combination of a strong electron withdrawing pendant group (fluorine atoms) with benzothiadiazole (BT) backbone significantly influences the electrochemical redox, optical and electrochromic behaviors of conducting polymers . The introduction of fluorine atoms to BT lead to a higher oxidation onset potential, but an improved electrochemical n-doping process. The optical band gaps (E g ) of PTBTB and PTBTB-F films are calculated to be 2.02 eV and 1.91 eV, respectively. PTBTB and PTBTB-F films exhibited obvious and reversible color switching between their neutral and oxidized states with high optical contrasts as well as favorable response times, making the polymers unique candidates for flexible organic electrochromic device applications.
研究领域:
材料科学
·
有机化学
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DOI
高影响因子
Analytical Methods
·
2015
·Vol. 7
·期 22
·9604-9608
·
IF 1.821
Yanhua Yu,Changzhi Dong
In this paper, an efficient colorimetric and fluorescent probe based on a benzothiadiazole derivative was developed for the detection of fluoride ions (F−). The selectivity of this approach capitalized on the highly selective and straightforward chemical reaction between F− and the Si–O bond. The sensing behavior of this probe towards anions was monitored by UV-visible and fluorescence spectroscopies in acetonitrile–aqueous buffer mixtures. Among the tested anions: F−, Cl−, Br−, I−, ClO4−, NO3−, CN−, HSO4−, AcO− and H2PO4− only F− induced a remarkable red-shift (149 nm) in the absorption spectrum which is concomitant with a color change from colorless to pink. This probe provides a new approach for naked-eyed detection of F− and the detection limit was calculated to be 1.7 μM. Besides, a concomitant fluorescence decrease was also observed. These results demonstrated that the probe could detect F− with excellent sensitivity and selectivity in complicated samples.
研究领域:
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2016
·Vol. 4
·期 38
·9094-9102
·
IF 5.066
Ming Li,Hui Zhang,Yan Zhang,Baoshan Hou,Chuangyang Li,Xibin Wang,Ji Zhang,LingHan Xiao,Zhanchen Cui,Yuhui Ao
Novel benzothiadiazole-based second-order nonlinear optical (NLO) chromophores with different push–pull structures were developed. Incorporation of benzothiadiazole (BTD) as a bridge for improving the electro-optic (EO) coefficient (r33) of bulky materials has not been well investigated, despite its extensive application in other photonic materials as electron acceptor. NMR and MS have been used to characterize the structure of synthesized chromophores 5–7. Optical properties have been investigated by UV-vis spectra. Density functional theory calculations have been used to calculate the first-order hyperpolarizability (β) of chromophores r1, 5a, 7a and 5b. Moreover, the poling results of guest–host EO polymers, 5a/PC and 5b/PC, afforded good r33 values of 67 pm V−1 and 45 pm V−1, respectively. All the results demonstrated an improvement in both micro- and macroscopic nonlinearity after incorporation of BTD into chromophores.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
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