PHOTOCHEMISTRY AND PHOTOBIOLOGY
·
2013
·Vol. 90
·期 3
·496-502
·
IF 2.287
Kun Li,Qin Zhang,Mei Wang,Rongrong Zhu,Xiaoyu Sun,Xianzheng Wu,Shi-Long Wang
Tanshinone IIA (Tan IIA) has the properties of cardiovascular protection, anti-inflammation, antioxidation and anticancer. Its light-induced instability has drawn our interests in its photochemistry. Therefore, laser flash photolysis herein was used to investigate the transient photochemistry of Tan IIA. Our results show that direct photoexcitation by 355 nm laser pulses or photosensitization by energy transfer can lead to the formation of the triplet state of Tan IIA ( 3 Tan IIA*). The triplet absorption spectrum and molar absorption coefficient, and ISC quantum yield were determined. Self-quenching of 3 Tan IIA* by its ground state was identified as an autooxidation reaction. 3 Tan IIA* was proved to react quickly with N , N -dimethylaniline, tert-butylhydroquinone and propyl gallate via electron transfer with the diffusion-controlled rate constants. One of the products with maximum absorption around 390 nm was assigned to the radical anion of Tan IIA. Our results indicate that 3 Tan IIA* is a reactive transient species and can be generated by photosensitization or direct photoexcitation. According to our results, the possible role of Tan IIA as a photosensitizer to induce potential phototoxicity via Type-II pathway in the presence of O 2 can be predicted.
研究领域:
药理学
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光化学
·
生物医学工程
✓ 已验证
DOI
高影响因子
FUEL
·
2023
·
IF 7.4
Junjian Xie,Yuxuan Liang,Bo Yang,Jun Zhang,Jiawei Xie,Ji-Jun Zou,Qiuyu Zhang
Solar-energy-driven synthesis of high-density biofuels can help to achieve the dual carbon goal of the aviation industry sooner. Herein, a novel photo-Conia strategy was developed for synthesis of high-performance asymmetric polycyclic hydrocarbons from biomass-derived various ketones and petroleum-derived norbornene. The photosensitized Conia reaction mechanism is comprehensively revealed by the combination of monochromatic light excitation, triplet quenching, phosphorescence quenching, Stern-Volmer kinetic analysis and DFT calculations. The photoaddition of cyclopentanone and norbornene has a much faster reaction rate than self-cycloaddition of norbornene, and the green solvent water can promote both the norbornene conversion and the selectivity of monoadduct, along with the optimal norbornene conversion of 94.9 % and monoadduct selectivity of 91.6 %. After hydrodeoxygenation, the hydrocarbon derived from cyclohexanone/norbornene mixture endows high density of 0.941 g∙mL −1 (20.6 % higher than conventional aviation kerosene, 0.78 g∙mL −1 ) and volumetric net heat of combustion of 40.11 MJ∙L −1 , which is much higher than that of classic JP-10 (39.41 MJ∙L −1 ). Therefore, this work provides a new and eco-friendly route for synthesis of high-performance hydrocarbons using renewable resources (biomass) and renewable energy (solar energy).
研究领域:
有机化学
·
可再生能源
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
TETRAHEDRON
·
2017
·
IF 2.651
Ling-Ling Wu,Li Tang,Shui-Gen Zhou,Yi-Jie Peng,Xiao-Dong He,Zhi Guan,Yan-Hong He
We report an example of Rose Bengal-photosensitized oxidation of tertiary amines for the synthesis of bis-1,3-dicarbonyl compounds. This protocol employs Rose Bengal as a visible-light absorbing photocatalyst without the need of a transition metal, and air as a green oxidant . Various functional groups were well tolerated to afford products with yields of up to 80% under mild reaction conditions.
研究领域:
有机化学
·
绿色化学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2019
·
IF 3.375
Qian Chen,Yi Feng,Rongrong Tian,Jinghang Chen,Anqing Wang,Jianfeng Yao
Photosensitization is a promising way to make UiO-66 visible light responsive. In this work, zirconium (Zr) precursors and synthetic methods (solvent-assisted or nonsolvent-assisted) were found to significantly affect the electric charge and the defect sites of UiO-66. UiO-66 with enhanced adsorption and photosensitized photocatalytic ability was then obtained. When ZrOCl2·8H2O was applied as Zr-precursor in a nonsolvent method, defect rich UiO-66 (UiO–OCl–N) was achieved with higher Cr(VI) adsorbing ability and improved photosensitized photocatalytic ability. Moreover, with the coexistence of Rhodamine B in Cr(VI) solution, photocatalytic performance of UiO-66 can be further enhanced.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2024
·
IF 7.1
Jun Zhang,Xiu-tian-feng E,Bo Yang,Xiumei Ma,Xueping Wang,Ninghui Chang,Qiuyu Zhang,Ji-Jun Zou,Junjian Xie
High-energy-density cyclobutane fuels were directly synthesized via room-temperature-integrated one-pot two-step oxidation/self-photosensitized [2 + 2] cycloaddition using lignocellulose-derived cyclic ketones and cyclic alcohols for the first time, which endow much higher density, lower freezing point, and higher neat heat of combustion than other biofuels achieved from the same feedstocks and hence denote a new kind of sustainable high-density fuels appealing for practical applications.
研究领域:
有机化学
·
可再生能源
·
生物燃料开发
✓ 已验证
产品关联
DOI
高影响因子
DYES AND PIGMENTS
·
2013
·
IF 3.532
Xu-Feng Zang,Yang-Fan Xu,Zafar Iqbal,Zu-Sheng Huang,Dai-Bin Kuang,Lingyun Wang,Herbert Meier,Ying Li,Derong Cao
Three novel metal-free organic dyes with dihydro-5 H -dibenzo[ b , f ]azepine as a donor and cyanoacrylic acid as an anchoring unit were designed as an innovative linear skeleton of D–D–π–A type of organic dyes. The conversion efficiency of the derived dye-sensitized solar cells is moderate. Among them, the dye with a hydroxy group as an additional anchoring moiety exhibited the highest UV–Vis absorption with a maximum molar extinction coefficient of 24,136 M −1 cm −1 at λ max = 458 nm and the best photovoltaic performance with an overall power conversion efficiency of 4.88%, while the dye with a carboxy group as an additional anchoring moiety exhibited the lowest conversion efficiency (4.52%). The results show that the dye loading on the film and photovoltaic performance of the dyes were influenced by the additional anchoring units.
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 Materials Chemistry A
·
2014
·Vol. 2
·期 37
·15365-15376
·
IF 0
Zu-Sheng Huang,Hao-Lin Feng,Xu-Feng Zang,Zafar Iqbal,Heping Zeng,Dai-Bin Kuang,Lingyun Wang,Herbert Meier,Derong Cao
Four novel D–π–A metal-free organic dyes DTP1–4 containing a dithienopyrrolobenzothiadiazole (DTPBT) unit were synthesized and applied in dye-sensitized solar cells, where DTPBT was employed as a π-spacer for the first time. The photophysical, electrochemical and photovoltaic properties of the dyes were systematically investigated. The dyes DTP1–4 showed broad absorption spectra and high molar extinction coefficient, resulting in high light harvesting efficiency. In addition, the impacts of donors and the thiophene unit as an additional π-spacer were also studied. The results showed that the dye DTP4 with triphenylamine as the donor exhibited better photovoltaic performance than DTP1–3 with phenothiazine as the donor. The linking position of the thiophene unit to the DTPBT unit significantly influenced the photovoltaic performance. A power conversion efficiency of 7.55% with 1 mM CDCA as the co-adsorbent under simulated AM 1.5 G illumination was reached by the DSSC sensitized by the dye DTP4. These results indicate that the DTPBT-based organic dye is a promising candidate for efficient DSSCs.
研究领域:
材料科学
·
能源科学
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有机化学
✓ 已验证
DOI
CATALYSIS COMMUNICATIONS
·
2011
·
IF 2.827
Jing Yang,Kunqi Wang,Liang Liang,Ligang Feng,Yuwei Zhang,Bo Sun,Wei Xing
A hybrid photoelectrochemical biofuel cell is composed of a TiO 2 film conductive glass electrode sensitized by a copper chlorophyll trisodium salt in combination with the platinized cathode and the electrolyte which contains redox mediator and enzyme as catalyst. The photovoltaic measurements indicate the optimal dye-adsorption time is 4 h and the incident photon-to-collected electron conversion efficiency is 16% at 400 nm. From the current–voltage curve the open-circuit voltage, short-circuit current density, maximum power density and overall energy conversion efficiency are 468 mV, 482 μA/cm 2 , 97 μW/cm 2 and 9.7%, respectively.
研究领域:
生物工程
·
材料科学
·
可再生能源
✓ 已验证
DOI
高影响因子
Separations
·
2023
·Vol. 10
·期 6
·335
·
IF 2.6
Nian Wang,Die Zhou,Huaying Liu,Yina Tu,Yanqiong Ma,Yingjie Li
Photochemical generation is an important pathway for atmospheric sulfate formation. However, the roles of atmospheric co-existing photosensitive dissolved organic matter (DOM) in sulfate formation are still unclear. The experimental results in this work provide evidence that atmospheric photosensitizers produce active intermediates to oxidize S(IV) into S(VI) under illumination. Quenching experiments of eight photosensitive model compounds (PS) demonstrate that their triplet-excited states (3PS*) dominate sulfate formation for the photosensitizing pathway with a contribution of over 90%, and1O2plays an important role in sulfate formation. The results using humic acid (HA) and water-soluble organic carbon in vehicle exhaust particles (WSOC) as representatives of atmospheric photosensitizers further verify that triplet-excited DOM (3DOM*) is the main reactive species for sulfate formation, which is consistent with the results of PS. Our findings provide new insights into the photochemical formation pathways of atmospheric sulfate.Keywords:atmospheric oxidants;atmospheric sulfate;water-soluble organic carbon;aqueous-phase oxidation;triplet-excited states;photosensitization
研究领域:
大气化学
·
环境科学
·
光化学
✓ 已验证
产品关联
DOI
高影响因子
WATER RESEARCH
·
2025
·
IF 12.4
Lingyou Meng,Zhuo Li,Binhong Qu,Peng Li,Jianhui Sun,Yang Qu,Ziqing Zhang,Liqiang Jing
The ultrasensitive, visual and intelligent identification of persistent chlorophenols (CPs) in complex drinking and environmental water matrices is highly desirable. In this study, we have established an interesting colorimetric dye eosin Y (EY)-molecular imprinted Bi 4 O 5 Br 2 nanosheet photosensitization sensing system for CPs detection, in which the key is the rapid EY photosensitization decolorization to be efficiently inhibited in the presence of CPs. It displays an ultrasensitive detection of CPs, especially for the typical 2,4,6-trichlorophenol (TCP) across from 10 ng·L −1 to 1 mg·L −1 , achieving a limit of detection of 7 ng·L −1 with remarkable selectivity. By means of in-situ Fourier transform infrared spectroscopy, time-resolved laser flash photolysis spectroscopy, and theoretical calculations, the outstanding performance is attributed to (i) the efficient transfer of triplet excited state electrons from EY to the ultrathin Bi 4 O 5 Br 2 (∼4 nm) nanosheets through energy band alignment and (ii) enhanced TCP selective adsorption resulting from a planar adsorption configuration induced by multiple Bi–Cl interactions, along with specific molecular imprinting recognition sites. Additionally, a real-time intelligent sensing platform was further engineered by integrating automatic sampling, an optical fiber source and a smartphone with color recognition software, enabling convenient and visual detection of TCP in challenging water environments. The sensing system exhibited excellent performance in detecting TCP across various actual water matrices, achieving acceptable recovery rates ranging from 93.33% to 113.33% with the relative standard deviations between 0.80% and 11.31%. It also demonstrated significant advantages over the ultra-performance liquid chromatography-tandem mass spectrometry, particularly regarding speed, simplicity and sensitivity, thus indicating substantial potential for practical applications in water quality monitoring.
研究领域:
环境科学
·
分析化学
·
纳米技术
·
材料科学
·
传感器技术
·
水污染检测
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ANALYTICAL CHEMISTRY
·
2019
·
IF 6.35
Yufeng Liu,Min Zhou,Wen Cao,Xiaoyu Wang,Quan Wang,Sirong Li,Hui Wei
Nanomaterials with enzyme-like characteristics (nanozymes) have been developed to mimic enzymes because of their low cost, high stability, and large-scale production. By using light as an external stimulation, one can modulate nanozymes’ catalytic activities with controlled spatial and temporal precision. A few inorganic photoactive materials have been investigated to construct light-responsive oxidase-like nanozymes. However, these materials suffered from limited absorbance of visible light. To address this challenge, herein we have developed a photosensitized metal–organic framework (PSMOF) by using a derivative of Ru(bpy)32+ with stronger visible-light absorption as a PS linker. The PSMOF exhibited excellent oxidase-like activity, which could be modulated by switching light on and off. Moreover, the PSMOF was used to detect glutathione levels in both normal and cancer cells with good selectivity and high sensitivity. This study not only provides a smart strategy to modulate nanozymes’ activities but also broadens the sensing applications of nanozymes.
研究领域:
材料科学
·
纳米技术
·
生物化学
·
分析化学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2019
·
IF 6.393
Tingyan Shi,Zuorui Wen,Lijun Ding,Qian Liu,Yingshu Guo,Caifeng Ding,Kun Wang
A novel photoelectrochemical (PEC) aptasensor for diclofenac detection, based on visible/near-infrared (vis/NIR) light-responsive vanadyl-phthalocyanine/graphitic carbon nitrid nanosheet (VOPc/CN) nanocomposites, was successfully fabricated. In this work, the first coupling of CN and VOPc with a facile solution–phase method was prepared and applied to PEC sensing. The UV–vis diff ;use reflection spectra (DRS) indicated that VOPc is an excellent photosensitizer when applied to the surface of CN. It promoted CN light absorption to the visible-NIR region, which greatly enhanced the light excitation capability. The PEC signal of the VOPc/CN nanocomposites improved 2.7 and 12.42-fold compared with pure VOPc and CN, respectively, indicating that VOPc/CN nanocomposites have good photoelectric activity and enhanced photo-to-current conversion efficiency. As a result, VOPc sensitized CN was introduced as a covalent immobilizing PEC aptasensor for the sensitive and selective determination of diclofenac (DCF). Under optimal conditions, the fabricated PEC biosensor exhibited good PEC performances with high sensitivity, a low detection limit of 0.03 nM (S/N = 3) and a wide linear response, in the range of 0.1-500 nM. This was due to the specific interaction between DCF and the aptamer. It is concluded that VOPc/CN nanocomposites are potentially promising photoactive materials for applications in PEC biosensors, as well as for photocatalysis and other related fields.
研究领域:
分析化学
·
环境科学
·
生物医学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）