SCIENCE OF THE TOTAL ENVIRONMENT
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2022
·
IF 10.753
Xiaoxuan Zhou,Tao Liu,Shengyi Zhang,Bo Kang,Xu Duan,Yuanyuan Yan,Leiyu Feng,Yinguang Chen
Fluorene (Flu) occurs widely in various environments and its toxicity to organisms is well-known. However, the impact of Flu on complicated biochemical processes involving functional microbial community has been reported rarely. In this study, the facilitation of Flu on the volatile fatty acids (VFAs) generation executed by acidogenic microbial population during sludge acidogenic fermentation (37 °C, SRT = 8 d, pH = 10.0) was investigated. The accumulation of VFAs (particularly acetic acid) increased initially and then declined with the increasing of Flu concentration (0‐500 mg/kg dry sludge), which reached a maximum (3211.1 mg COD/L) as Flu content was 200 mg/kg dry sludge . The Flu-enhanced VFAs production was primarily attributed to the shift of hydrolysis/acidification, as well as the corresponding functional microbial community and the activity of enzymes. Based on the metagenomics analysis, the conversion of organic substrates, i.e. amino acid and monosaccharide , into VFAs embraced in hydrolysis/acidification shaped by Flu was constructed at the genetic level. The relative abundances of genes included in aminotransfer and deamination process of amino acid and glycolysis of monosaccharide into VFA-precursors (pyruvate, acetyl-CoA and propionyl-CoA), and the further formation of VFAs were improved due to the Flu presence. This study shed light on the Flu-affected microbial processes at the molecular biology level during acidogenic fermentation and was of great significance in resource recovery of sludge containing persistent organic pollutants.
研究领域:
环境科学
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分子生物学
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微生物学
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DOI
PubMed
高影响因子
FOOD AND CHEMICAL TOXICOLOGY
·
2023
·
IF 4.3
Qiwen Feng,Yumeng Liu,Liping Zou,Mengying Lei,Changhong Zhu,Wei Xia
Fluorene-9-bisphenol (BHPF) is an emerging global endocrine-disrupting chemical found in numerous household products as a substitute of bisphenol A. Many studies have reported various toxicities associated with BHPF. However, the effect of BHPF on male reproduction, particularly on the structural integrity of the blood testis barrier (BTB) in mice, has not yet been extensively studied. Ferroptosis , a newly identified form of cell death, occurs in the testicular tissue following exposure to BPA, affecting male fertility. We investigated whether ferroptosis plays a role in BHPF-induced testicular damage. The findings indicated that BHPF exposure led decreases in serum testosterone (T) concentration and sperm concentration and motility in mice. Furthermore, BHPF disrupted the BTB by interfering with key BTB-related proteins, including Cx43, β-catenin, and ZO-1. Moreover, BHPF induced ferroptosis through the induction of lipid peroxidation, iron overload, oxidative stress , and mitochondrial dysfunction in the testicular tissue. Inhibition of ferroptosis using Fer-1 mitigated the BHPF-induced damage to the BTB and ferroptosis in TM4 cells. Overall, our findings indicated the detrimental effects of BHPF on male reproductive function in mice, suggesting ferroptosis as a mechanism underlying testicular damage.
研究领域:
毒理学
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生殖生物学
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内分泌学
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DOI
PubMed
高影响因子
CHINESE JOURNAL OF CHEMISTRY
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2012
·Vol. 30
·期 7
·1571-1574
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IF 0.755
Jing Cao,Yang Li,Junxiang Feng
Two kinds of novel styryl chemosensory 2-FMNC and 3-FMNC, were designed and synthesized by an apporiate introduction of 9-benzylidene-9 H -fluorene group as fluorophore with the aim at avoiding photoisomerisation. These 9-benzylidene-9 H -fluorene derivatives showed the similar selectivity and sensitivity upon addition of metal ions. The sensitivity of FMNC to alkaline earth metal ions was Ba 2+ >Sr 2+ >Ca 2+ ≈Mg 2+ .
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高影响因子
CRYSTENGCOMM
·
2024
·
IF 2.6
Wenxiu Yao,Pengfei Wu,Yidan Xie,Xinyu Shen,Shuwei Xia,Liangmin Yu
A series of charge transfer cocrystals with fluorescent properties involving 1,2,4,5-tetracyanobenzene (TCNB, C10H2N4) as the acceptor, fluorene (FR, C13H10) and its bromide 2-bromofluorene (2-BrFR, C13H9Br), carbazole (CZ, C12H9N) and its bromide 2-bromocarbazole (2-BrCZ, C12H8BrN) as donors were synthesized via cocrystal design strategies. The formation mechanism of the crystal structure was explored by density functional theory at molecular level. The stacking structure of the cocrystal was formed by the combined interaction of charge transfer interactions, π-π interactions and hydrogen bonding. N atom of donors in TCNB-CZ and TCNB-2-BrCZ could enhance the charge transfer, appear as a red shift of the fluorescence emission wavelength. Conversely, Br atom in TCNB-2-BrFR and TCNB-2-BrCZ weaken the charge transfer, giving a blue shift in fluorescence emission spectrum. The four new cocrystals exhibit tunable luminescence from green (529 nm) to yellow (552 nm) and to red (604 nm and 614 nm). It was found that the introduction of N and Br atoms in the assembly units can not only regulate the luminescence range of the cocrystals, but also adjust the luminescence efficiency, which provides a strategy for the development of promising organic luminescent materials.
研究领域:
材料科学
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有机化学
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光化学
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晶体工程
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高影响因子
OPTICAL MATERIALS
·
2019
·
IF 2.687
Ting Zhang,Xiaojie Cheng,Xuchun Wang,Changchun Song
Two bipolar fluorene-cored derivatives, namely BFCz and BFPCz , containing electron-transporting benzothiazole and hole-transporting carbazole moieties, are synthesized utilizing the Suzuki C-C coupling reactions, and characterized by NMR, MS and elemental analysis . These compounds possess good thermal stability with decomposition temperature up to 400 °C, and strong deep-blue emission in solution with excellent fluorescent quantum yield of over 70%. They also show high HOMO energy levels of −5.44 eV and −5.57 eV for effective hole injection and transportation from hole-transporting layer to the emitting layer. The non-doped OLEDs using these fluorene-cored derivatives as emitters by means of vacuum deposition process emit pure deep-blue electroluminescence with CIE coordinates of y ≤ 0.15, achieving maximum luminance efficiencies of 2.59 cd A −1 for BFCz , 2.87 cd A −1 for BFPCz .
研究领域:
材料科学
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光学
·
有机电子学
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DOI
高影响因子
HIGH PERFORMANCE POLYMERS
·
2023
·
IF 2.1
Huanhuan Gao,Xiaozhou Zhang,Xigao Jian,Jinyan Wang
In this study, the melt polycondensation reaction of 9,9’- bis(4-hydroxyphenyl)fluoride (BHPF) and diphenyl carbonate (DPC) was catalyzed using three ionic liquids (ILs) and a conventional alkali metal as catalysts. The optimal IL catalysts were determined to be [BMmim][BF4] ionic liquid catalysts, and the catalytic mechanism was investigated. Furthermore, the optimum process conditions were identified: the optimal amount of [BMmim][BF4] was 0.05 mol% based on DPC, the polycondensation temperature was set at 200°C for a duration of 3 h, followed by polymerization at 280°C for another 3 h. As a result, the Mn value of poly(9,9-bis(4-hydroxyphenyl) carbonate) (PFC) reached up to 41387 g/mol with a glass transition temperature band of approximately 254°C and Td-5% value of around 436°C.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
Polymer Chemistry
·
2020
·Vol. 11
·期 21
·3605-3614
·
IF 5.342
Guiting Chen,Dan Cheng,Wenyan Zou,Ziyan Cai,Yufeng Xie,Yaqi Chen,Baitian He,Hongqing Hao,Wei Yang,Yong Cao
Herein, a novel electron-deficient conjugated water/alcohol-soluble polyelectrolyte (WSPE) named PFSOPyCl-E, consisting of dibenzothiophene-S,S-dioxide, bispyridinium salts and fluorene with ethylene oxide side chains, was presented. Previously we have synthesized another WSPE (PFSOPyCl) composed of the same backbone as that of PFSOPyCl-E but with octyl side chains. PFSOPyCl and PFSOPyCl-E were applied as cathode buffer materials (CBMs) to inverted polymer solar cells (PSCs) of poly[4,8-bis(2-ethylhexyloxyl)benzo[1,2-b:4,5-b′]dithiophene-2,6-diyl-alt-ethylhexyl-3-fluorothithieno[3,4-b]thiophene-2-carboxylate-4,6-diyl] (PTB7):[6,6]-phenyl-C71 butyric acid methyl ester (PC71BM) systems, and simultaneous enhancements in open-circuit voltage (Voc), short-circuit current density (Jsc) and fill factor (FF) could be achieved when inserting these cathode buffer layers (CBLs). It was found that these CBLs could build directed dipoles at the indium tin oxide (ITO)/active layer interfaces, leading to the reductions in the ITO work function (WF) and improvements in Voc for the modified devices. The Jsc and FFs of PSCs were increased by several mechanisms. Firstly, the energy level alignments between the reduced ITO WFs (4.30–4.32 eV), deep LUMO energy levels (ELUMO) of these CBLs (4.04–4.10 eV) and ELUMO of PC71BM (∼3.90 eV) could generate good ohmic contacts, facilitating electron extractions and transportations. Secondly, these CBLs were able to n-dope PC71BM at the interfaces, inducing efficient electron-transporting pathways in the devices. Moreover, these polar polymeric CBLs could improve the compatibilities between ITO and the active layers, thus decreasing the interfacial resistances. It is worth noting that PFSOPyCl-E showed better cathode-modifying performance than PFSOPyCl, probably since PFSOPyCl-E with ethylene oxide side chains of high polarity and flexibility possessed better wettability with ITO and smoother films than PFSOPyCl. Hence, the devices modified by PFSOPyCl-E displayed lower contact resistances and higher FFs and Jsc than the PFSOPyCl-modified ones. Therefore, this class of electron-deficient conjugated WSPEs are promising CBMs for high-performance PSCs.
研究领域:
材料科学
·
能源科学
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DOI
高影响因子
ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Jiaqi Xu,Zongcai Deng,Bo Wu,Meijin Lin,Dongyang Chen
Organic polymers containing redox-active moieties have attracted increasing attention as electrode materials for high-performance rechargeable batteries due to their sustainability, flexibility, environmentally benign, and high stability. Herein, viologen functionalized fluorene-containing poly(arylene ether ketone)s (MV-FPAEKs) were synthesized by polycondensation , bromination, and quaternization in sequence. 1 H NMR was used to monitor the degree of functionalization (DF), which increased with the increasing of the molar ratio of the bromination agent. The MV-FPAEK-96 with a DF of 96% for viologen was used as the active material for polymer cathode. The theoretical specific capacity was calculated to be 87.6 mAh g −1 based on the dual electron transfer per viologen unit. It had been found that the MV-FPAEK-96 battery delivered a discharge specific capacity of 87.1 mAh g −1 at a current rate of 0.1 C, and maintained 32.1 mAh g −1 after 100 galvanostatic cycles. In contrast, the small molecule of dimethyl viologen was highly soluble in the electrolyte, and the corresponding capacity decreased to negligible values after only 20 cycles. Therefore, the attachment of viologen to polymeric backbones is an effective strategy to increase the stability in electrolyte while maintaining the rechargeability, and the MV-FPAEK-96 is a promising redox-active candidate for polymer batteries.
研究领域:
材料科学
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电化学
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DOI
高影响因子
CHEMISTRY OF MATERIALS
·
2026
·
IF 7.1
Hao Zhang,Rui Wang,Can Tang,Chengkai Xu,Shuting Zhai,Weijun Zhao,Yongzhen Wu
Organic single-luminophore systems featuring regulated monomer–excimer emission constitute an attractive framework for adaptive photonic materials. Here, we report two thiophene-decorated fluorene derivatives, TDDF and MTDDF, designed to modulate molecular packing and excimer formation through heteroarene-involved interactions. Compared with the nonthiophene analogue DDF, thiophene incorporation decreases optical bandgaps, enhances thermal robustness, and promotes close intermolecular association, leading to pronounced excimer emission in aggregated states. Single-crystal analyses reveal that methyl substitution in MTDDF increases intermolecular spacing, enabling a finely tunable balance between monomeric and excimeric states. When dispersed in a fatty-acid phase-change matrix, MTDDF exhibits a distinct, reversible thermally modulated luminescence transition across the physiological temperature range, producing a continuous color shift from yellow-green to blue. This thermally driven packing reorganization enables highly sensitive ratiometric temperature readout, delivering a maximum sensitivity of 44% °C–1 near 37 °C, among the highest reported for organic luminescent thermometers. This work demonstrates thiophene decoration as an effective approach for stabilizing excimer states and provide a versatile design strategy for advanced thermoresponsive luminophores and stimuli-adaptive photonic materials.
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高影响因子
EUROPEAN POLYMER JOURNAL
·
2026
·
IF 6.8
Mengdie Gan,Shiyan Feng,Jin Zhu,Jinggang Wang
Partially bio-based PECBF copolyesters were synthesized from FDCA, BPEF, CHDM and EG. • The copolyesters turn fully amorphous above 10 mol% BPEF, with lower softening and processing temperature than those of PEN/PCTT. • PECBF15 combines a Tg of 100 °C, 68 MPa strength, 65% elongation and <5% haze. Commercial polyesters such as PET and PBT suffer from limited heat resistance, while the heat-resistant PEN and PCTT demand high processing temperatures, and are fully petroleum-based. The bio-based alternative PEF combines only a modest glass transition temperature with pronounced brittleness. Herein, partially bio-based, highly heat-resistant PECBF copolyesters were synthesized from dimethyl furan-2,5-dicarboxylate, 9,9-bis[4-(2-hydroxyethoxy)phenyl]fluorene (BPEF), 1,4-cyclohexanedimethanol and ethylene glycol via transesterification–melt polycondensation (M n = 36,000–49,500 g/mol, Đ = 1.47–1.75). Quantitative 13 C NMR sequence analysis reveals a random but non-ideal comonomer distribution in which BPEF units are preferentially isolated (L n ,BF = 1.1–1.3 even at ≥ 20 mol% BPEF), suppressing consecutive BFB sequences. The copolyesters turn fully amorphous above 10 mol% BPEF, while the glass transition temperature rises from 82 to 115 °C and the Vicat softening temperature from 90 to 117 °C, with 5 % weight-loss temperatures above 365 °C. The PECBF15 and PECBF30 show lower processing temperatures than PET, and afford high transparency (>82 %) and low haze (< 5 %). At 15 mol% BPEF, the copolyester combines a T g of 100 °C with a yield strength of 68 MPa and an elongation at break of 65 %, reconciling heat resistance, toughness, melt processability and transparency. With heat resistance approaching that of PCTT and PEN, substantially lower processing temperatures and a partially bio-based constitution, these PECBF copolyesters show promise as potential candidates for applications requiring heat-resistance and transparency with moderate optical scattering. Download: Download high-res image (150KB) Download: Download full-size image
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ELECTROCHIMICA ACTA
·
2026
·
IF 5.6
Meng Wang,Zhe He,Saijin Wang,Yanli Zhao,Naitian Zhang,Ximing Cui,Xiaoyan Yu,Shi Zhou,Huiting Mao,Jinlian Li,Yiying Zhang
Zebrafish (Danio rerio) is a widely adopted vertebrate model in toxicological research, yet current growth-toxicity assessments rely heavily on morphological endpoints that demand long observation periods and thus preclude rapid screening or early warning. The persistent organic pollutant fluorene perturbs purine metabolism in zebrafish embryos at environmentally relevant concentrations and subsequently impairs embryonic development. Herein, we present a novel electrochemical sensor based on an iridium oxide-modified glassy carbon electrode (IrO₂/GCE) that enables ultrasensitive monitoring of xanthine and guanine (X/G) fluctuations as metabolic biomarkers of fluorene cytotoxicity. Comprehensive characterization by scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), and cyclic voltammetry (CV) confirmed the surface morphology, elemental composition, and electrochemical performance of the modified electrode, affording high sensitivity and a wide linear range for the simultaneous detection of four purines. Using X/G as sentinel analytes, the IrO₂/GCE platform successfully tracked dynamic purine metabolic changes in fluorene-exposed embryos, corroborated by high-performance liquid chromatography (HPLC). Notably, the electrochemical assay already detected fluorene-induced suppression of purine levels at as early as 24 hpf, with excellent concordance to HPLC data. The IrO₂/GCE sensing system therefore provides a rapid, reliable, and embryo-scale tool for developmental toxicity assessment of fluorene and lays a solid technical foundation for the early-warning monitoring of persistent organic pollutants in the environment.
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高影响因子
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2014
·Vol. 119
·期 3
·1913-1921
·
IF 2.206
Wang Hui,Wang Jun,Feng Tian-tian,Ramdani Noureddine,Li Yue,Xu Xiao-dong,Liu Wen-bin
A series of fluorene-based benzoxazine-endcapped copoly(ether ketone ketone)s (co-PEKKs) were successfully synthesized, in which the co-PEKKs were prepared with different molar ratios of 2,7-dihydroxy-9-fluorenone to bisphenol-A. The obtained phenol-ended co-PEKKs reacted with formaldehyde and n -butylamine to yield the benzoxazine-endcapped co-PEKKs (B-PEKKs). The structure of these oligomers was studied by Fourier transform infrared spectroscopy and 1 H nuclear magnetic resonance spectroscopy, and the molecular mass of these phenol-ended co-PEKKs was detected by gel permeation chromatography. The thermal behaviors of these B-PEKKs were determined by differential scanning calorimetry. In addition, the thermal and dynamic mechanical properties of the polymer films were investigated by thermogravimetric analysis and dynamic mechanical analysis. The results indicate that the incorporation of co-PEKKs within the benzoxazine backbone considerably improves the toughness of the fluorene-containing polybenzoxazines without much sacrifice of their thermal properties. Furthermore, as the content of 2,7-dihydroxy-9-fluorenone increases, the T
5 values decrease, while the T
g values and char yields of the prepared polymers increase to reach their highest values at 256 °C and 64 %, respectively.
研究领域:
材料科学
·
高分子化学
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高影响因子
危险品化学品经营许可证（带存储）