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An integrated biological analysis and flow rate sensing for the real-time detection of carcinogen in water based on Co2+-doped optical fibers
摘要： The multi-parameter measurement has significant meaning for biosensor to enhance their practical sensing performance. For the biological detection, simultaneous measurement of biological molecule and flow rate could improve the accuracy and sensitivity of sensors significantly. In this paper, an integrated biological analysis and flow rate sensing based on Co2+ doped tilted fiber Bragg gratings has been proposed and experimentally demonstrated for the detection of the Benzo[a]pyrene molecules. A tilted fiber Bragg grating with a tilted angle of 8o was inscribed into a Co2+ doped fiber. The flow rate and Benzo[a]pyrene molecules can be measured simultaneously by interrogating the resonance wavelength of core mode and wavelength interval between the core mode and cladding mode according to the heat exchange and evanescent field of the cladding mode, respectively. Experimental results show that the real-time measurement sensitivities of 12 pm/pM and -0.13 nm/(μL/s) for the Benzo[a]pyrene detection and flow rate were achieved, respectively. Thus the technique appears to have potential applications in chemistry, medicine, and biology.
关键词： Thermal effects,Co2+ doped tilted fiber Bragg gratings,Flow rate measurement,Benzo[a]pyrene detection
更新于2025-09-12 10:27:22
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Dimethylaniline functionalised pyrene fluorophores; dual colour pH switching in solution and self-assembled monolayers
摘要： A pyrene charge transfer fluorophore with three ionizable N,N-dimethylaniline moieties was explored as an interfacial pH switch. The parent carboxylate compound and the thiolated derivative were shown by spectroscopy combined with DFT calculation to be successively and reversibly protonated. Protonation leads to progressive decrease of intensity of the 550 nm centered N,N-dimethylaniline to pyrene charge transfer emission which on protonation of the third site, leads to extinction of this transition and evolution of an intense blue (450 nm) pyrene-centered emission. Concomitant loss of the charge transfer absorbance was observed and the changes are reversed on neutralization of pH. A self-assembled monolayer of the thiolated derivative was prepared on gold and found from voltammetry of ferricyanide/ferrocyanide probe to form close packed monolayers. The probe voltammetry, label-free electrochemical impedance spectroscopy of the film was monitored as a function of pH and progressive, but reversible protonation steps were reflected in decreasing film resistance. The Stokes shift of the probe prevents self-quenching so a broad, charge transfer fluorescence centered around 540 nm was recorded for the self-assembled monolayer where as per solution, progressive and reversible reduction in intensity was observed. The facile assembly, impedance and optical switching make these materials potentially interesting as on–off or two colour on–off–on fluorescence switches with potential applications in logic gates or in responsive surface applications.
关键词： DFT calculation,self-assembled monolayer,fluorescence,charge transfer,pH switch,pyrene
更新于2025-09-12 10:27:22
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Position effect of arylamine branches on pyrene-based dopant-free hole transport materials for efficient and stable perovskite solar cells
摘要： In this work, arylamine branches N4-[4-[Bis(4-methoxyphenyl)-amino]phenyl]-N1,N1-bis(4-methoxyphenyl)-1,4-benzenediamine are introduced to the 1,6- and 2,7-positions of pyrene core to afford two novel HTMs coded PYR16 and PYR27. The influence of different positions of arylamine units on the optical and electronic properties and the performance of PSCs are investigated. The perovskite solar cells (PSCs) using dopant-free PYR16 exhibite a PCE of 17.00%, which is higher than that of PYR27 (14.67%). Furthermore, the PSCs based on PYR16 obtain better stability than those using PYR27 by maintaining 98% of the initial values after 1080 h at 80 ℃ in an ambient environment in the dark and 85% of initial values after 672 h under continuous sunlight soaking in an ambient environment at 45-50 ℃.
关键词： perovskite solar cell,position effect,stability,hole transport material,pyrene
更新于2025-09-12 10:27:22
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Pyrene Based NLOphoric D‐π‐A‐π‐D Coumarin‐Chalcone and Their Red Emitting OBO Difluoride Complex: Synthesis, Solvatochromism, Z‐scan, and Detailed TD‐DFT Studies
摘要： NLOphoric D-π-A-π-D coumarin chalcone 5 and their BF2 complex 6 were designed, synthesized and characterized through Mass,13C-NMR, and 1H-NMR analysis. Their Photophysical properties are extensively studied in solvents of different polarity. On BF2 complexation of coumarin chalcone shows highly red shift in absorption and emission spectra compared to uncomplexed coumarin chalcone. Positive solvatochromism observed which is well supported by linear and multilinear regression analysis. For BF2 complexed coumarin-chalcone 6 the solvent dipolarity (CSdP) is the main factor responsible for slightly red shift in absorption spectra, and also for the highly red-shift in emission spectra. Frontier molecular orbital, molecular electrostatic potential and Generalized Mulliken-Hush analysis revealed intramolecular charge transfer in these compounds. Nonlinear optical (NLO) properties for compounds 5 and 6 were studied by solvatochromic and computational method. The linear polarizability (α), first-order hyperpolarizability (β) and second-order hyperpolarizability (γ) of compounds were studied by the time dependent density functional theory using three different functionals namely B3LYP, BHHLYP and CAM(cid:0) B3LYP with the 6–31 G (d) basis set. BF2 complexed compound 6, show higher values for αe + αv as well as βe+βv compared to compound 5. Third order nonlinear optical susceptibility (χ(3)) of these compounds obtained by Z-scan analysis. Third-order (χ(3)) non-linear optical properties of BF2 complexed coumarin-chalcone 6 were observed to be several times higher than those of the uncomplexed coumarin-chalcone 5 these justify the design approach.
关键词： NLOphoric,Z-Scan,positive solvatochromism,pyrene-chalcones,TD-DFT,solvatochromic NLO
更新于2025-09-11 14:15:04
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New pyrene-based butterfly-shaped blue AIEgens: Synthesis, structure, aggregation-induced emission and their nondoped blue OLEDs
摘要： Developing the blue emitters with excellent electroluminescence (EL) performance is crucial for full-color displays and solid-state lighting. Based on the synthetic strategy for exploring highly efficient luminescent solids by constructing aggregation-induced emission (AIE) systems, two new pyrene-based butterfly-shaped blue AIEgens, Py(5,9)BTPE and Py(5,9)BTriPE, have been successfully designed and synthesized by integrating two tetraphenylethylene (TPE) or triphenylethylene (TriPE) groups into pyrene ring. The adoption of the pyrene unit with a large optical bandgap, the use of the TPE or TriPE group with AIE characteristic, the integration of the TPE or TriPE group into pyrene ring at 5,9-positions, and the highly twisted molecular conformations of present AIE systems endow the two compounds with bright blue emission in the solid state. These foregoing features ensure that the new pyrene-based compounds can serve as excellent blue-emitting materials in OLEDs. A non-doped OLED based on Py(5,9)BTPE exhibited a sky-blue emission (Von: 3.2 V) with a CIE coordinates of (0.19, 0.28), a maximum external quantum efficiency (EQEmax) of 3.35%, a current efficiency (CE) of 6.51 cd A-1 with a low efficiency roll-off that represents one of the highest value reported for sky-blue AIE-based OLEDs. An analogous device with Py(5,9)BTriPE as an emitting layer displayed a pure-blue emission (CIE: 0.16, 0.17) with a moderate EQEmax of 1.27% and a CE of 1.63 cd A-1 with a low efficiency roll-off. Furthermore, the EL emissions of the two devices display almost no change with the increasing of the current density, indicating their good color stability.
关键词： nondoped OLED,blue AIEgens,aggregation-induced emission (AIE),phenylethylene,pyrene
更新于2025-09-11 14:15:04
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Synthesis and Properties of New Imidazole Derivatives Including Various Chromophore for OLEDs
摘要： Two new blue compounds were successfully synthesized by introducing phenanthroimidazole group as a side group into pyrene, a chromophore with good luminous efficiency: 1-(4-(10-(naphthalen-2-yl)anthracen-9-yl)phenyl)-2-(pyren-1-yl)-1H-phenanthro[9,10-d]imidazole (NA-PPI) and 1-(4’-(9H-carbazol-9-yl)-[1,1’-biphenyl]-4-yl)-2-(pyren-1-yl)-1H-phenanthro[9,10-d]imidazole (CP-PPI). The optical and electroluminescence properties of newly synthesized materials were measured. Both materials emit blue or sky-blue photoluminescence in the film state and have a high PLQY value of over 80% in solution state. The synthesized materials were applied as EML in non-doped devices, and high efficiency of 3.51 cd/A and EQE of 2.39% in CP-PPI device were achieved.
关键词： pyrene,blue emission,Organic light-emitting diode,imidazole,fluorescence
更新于2025-09-11 14:15:04
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Design of Novel Pyrene-Bodipy Dyads: Synthesis, Characterization, Optical Properties, and FRET Studies
摘要： A new series of dendronized bodipys containing pyrene units was synthesized and characterized. Their optical and photophysical properties were determined by absorption and ?uorescence spectroscopy. This series includes three different compounds. The ?rst one has an anisole group linked to the bodipy unit, which was used as the reference compound. In the second, the bodipy core is linked to a zero generation dendron with one pyrene unit. The third In this compound contains a ?rst generation Fréchet-type dendron bearing two pyrene units. work, the combination pyrene-bodipy was selected as the donor-acceptor pair for this ?uorescence resonance energy transfer (FRET) study. Doubtless, these two chromophores exhibit high quantum yields, high extinction coef?cients, and both their excitation and emission wavelengths are located in the visible region. This report presents a FRET study of a novel series of pyrene-bodipy dendritic molecules bearing ?exible spacers. We demonstrated via spectroscopic studies that FRET phenomena occur in these dyads.
关键词： ?uorescence resonance energy transfer (FRET),pyrene,bodipy
更新于2025-09-10 09:29:36
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Anthracene- and pyrene-bearing imidazoles as turn-on fluorescent chemosensor for aluminum ion in living cells
摘要： A newly designed 2-(2-Aminophenyl)-1H-benzimidazole integrated anthracene/pyrene derivatives as efficient chemosensors were synthesized. The probes N-(anthracen-9-ylmethylene)-2-(1H-benzo[d]imidazol-2-yl)aniline (ANP) and N-(pyren-1-ylmethylene)-2-(1H-benzo[d]imidazol-2-yl)-aniline (PYP) exhibited high selectivity and sensitivity towards Al3+ ion over other interfering and competing cations in aqueous solution. Job’s plot analysis reveals that the interaction of ANP/PYP with Al3+ was 1:1 binding stoichiometry. The detection limit of probes ANP and PYP for Al3+ ions were found to be 1.85 × 10-7 M and 1.08 × 10-7 M, respectively. The DFT/TD-DFT calculations have also been revealed that the ICT mechanism is responsible for the observed photophysical changes. Moreover, the probes ANP and PYP were applicable to image intracellular Al3+ ions in living cells via confocal fluorescence microscopy technique.
关键词： Pyrene,Al3+ imaging,ICT mechanism,Turn-on chemosensor,Anthracene
更新于2025-09-10 09:29:36
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Exploring aggregation-induced emission through tuning of ligand structure for picomolar detection of pyrene
摘要： Tuning of ligand structures through controlled variation of ring number in fused‐ring aromatic moiety appended to antipyrine allows detection of 7.8 × 10?12 M pyrene via aggregation‐induced emission (AIE) associated with 101‐fold fluorescence enhancement. In one case, antipyrine unit is replaced by pyridine to derive bis‐methylanthracenyl picolyl amine. The structures of four molecules have been confirmed by single crystal X‐ray diffraction analysis. Among them, pyrene‐antipyrine conjugate (L) undergoes pyrene triggered inhibition of photo‐induced electron transfer (PET) leading to water‐assisted AIE.
关键词： pyrene,AIE,sensor,SPE,SC‐XRD
更新于2025-09-10 09:29:36
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Cellular Detection of Hydrazine as Isoniazid Metabolite by a New Turn-On Fluorescent Probe: Synthesis, Live Cell Imaging and In Vitro Toxicity Studies
摘要： A new turn-on fluorescent probe 2-((pyren-3-yl) methyl) isoindoline-1,3-dione was synthesized in a single step, high yielding reaction to detect hydrazine in solution. This ligand is highly sensitive to detect hydrazine in micromolar (1.1 μM) concentration in solution. It has high selectivity towards hydrazine compared to other analytes. Different biophysical experiments like hydrazine screening from both tap water and distilled water, vapour phase detection, anti-interference studies with different analytes also corroborate the phenomenon of selective detection of hydrazine by our ligand. NMR titration and mass spectrum established the mechanism of hydrazine sensing. In addition, the probe was successfully used to trap exogenously added hydrazine inside the cell, which was further utilized to study insitu hydrazine released from an anti-tubercular drug Isoniazid (INH), after its metabolism.
关键词： Pyrene,Fluorescence,Pthalimide,Hydrazine,Isoniazid
更新于2025-09-10 09:29:36