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Photophysical features and semiconducting properties of propeller-shaped oligo(styryl)benzenes
摘要： Electronic, optical, and semiconducting properties of a series of propeller-shaped oligo(styryl)benzenes have been systematically investigated to monitor the effect of the number of styryl branches (three, four, and six) around a central benzene core. In order to clarify the relationships between their structures and properties, Density Functional Theory calculations were carried out at several levels of theory considering solvents with different polarity. Absorption and vibrational Raman spectroscopies showed that cruciform, four-branched derivatives present the most effective π-conjugation in agreement with the lowest calculated bond length alternation and bandgap. Deviations from the mirror image symmetry between absorption and fluorescence spectra were related to changes in the molecular conformation upon electronic excitation. Furthermore, in order to investigate the semiconducting behavior of oligo(styryl)benzenes, molecular structure changes and different electronic properties related to ionization processes were calculated and analyzed. Hole and electron reorganization energies were also computed to provide a first approximation on the n- or p-type character of these compounds. In some cases, electron reorganization energies comparable to common n-type semiconductors were found.
关键词： photophysical properties,Density Functional Theory,charge transport,Raman spectroscopy,oligo(styryl)benzenes,semiconducting properties
更新于2025-11-20 15:33:11
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Tuning the photophysical properties of carboranyl luminophores by <i>closo</i> - to <i>nido</i> -carborane conversion and application to OFF–ON fluoride sensing
摘要： A family of closo-carborane-appended luminophores (closo-OXD1–2 and closo-DPS1–2) in which 2-R-o-carboranes (R = H, Me) are attached to the diphenyl-1,3,4-oxadiazole (OXD) or diphenyl-sulfone (DPS) acceptor groups were prepared and characterized. Deboronation of the closo-carborane cage produced the corresponding nido-carboranyl luminophores (nido-OXD1–2 and nido-DPS1–2). Whereas the closo-compounds were poorly emissive in THF (ΦPL < 0.01), the nido-luminophores exhibited an intense fluorescence with good quantum yields (ΦPL = 0.1–0.45). Electrochemical studies showed that while the closo-OXD and -DPS compounds displayed only carborane-centred, quasi-reversible reduction, the nido-compounds exhibited the typical features for nido-carborane-centred, irreversible oxidation and acceptor-centred, reversible reduction. Theoretical studies suggested that while the 1ππ* state of closo-compounds is nonemissive due to the contribution of closo-carborane to the LUMO in the S1 excited state, the intramolecular charge transfer (ICT) state from the nido-carborane to acceptor moieties in nido-compounds leads to an efficient fluorescence. Finally, THF solutions of closo-OXD1 and -DPS1 showed strong fluorescence upon the addition of fluoride anions under mild heating, but were intact to other anions, including cyanide, allowing the selective OFF–ON fluorescence sensing of fluoride.
关键词： fluoride sensing,carborane,fluorescence,photophysical properties,luminophores
更新于2025-11-20 15:33:11
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[Lecture Notes in Electrical Engineering] Advances in Graphic Communication, Printing and Packaging Volume 543 (Proceedings of 2018 9th China Academic Conference on Printing and Packaging) || Application of Anthracene-Based Fluorescent Materials on Green Fluorescent Inkjet Ink
摘要： Presently, the existing green ?uorescent materials are rare earth luminescent material, which cannot reach the requirement of inkjet ink on dispersion and stability because of the inferior solubleness. In this paper, the ?uorescent inkjet inks were prepared by anthracene-based derivatives, ink’s printability was tested and the relationship between molecular structure and ink’s printability was researched systematically. Finally, the optimal formula of green ?uorescent inkjet ink was obtained. The results showed the photophysical properties of proofs a–c had obvious change comparing with inks a–c and the contact angle of ink d was the biggest of all due to the planar construction of ?uorescent material with large conjugate degree. The green ?uorescent material: 9, 10-bis (4-methoxyphenylethynyl) anthracene with 0.5% and crylic acid B817 with 12% formed the optimal formula. The printing quality of ink prepared by the optimal formula can accord with the demand of digital printing quality.
关键词： Fluorescent inkjet ink,Photophysical properties,Ink’s printability,Anthracene-based ?uorescent materials
更新于2025-11-14 15:26:12
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X-Shaped Polycyclic Aromatic Hydrocarbons: Optical Properties and Tunable Assembly Ability
摘要： Although a number of synthetic methodologies have been developed to prepare stable polycyclic aromatic hydrocarbons (PAHs), much less research has been devoted to functionalize the peripheral of molecules to tune the self-assembly ability or introduce functional groups without altering their photophysical properties. Herein, we report twisted “X” shaped molecules prepared through annulation of hexacene with benzoanthracene on the zigzag edge, and an investigation of their photophysical properties and self-assembly properties. The shape-complementary “X” shaped molecules prefer to dimerize, while the π-extension would lead to one dimensional π-stacking. Our findings gave some insights into the design of stable PAHs without disturbing the electronic structures.
关键词： Photophysical properties,Self-assembly,Polycyclic aromatic hydrocarbons,Dimerize
更新于2025-09-23 15:23:52
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BODIPY derivatives bearing borneol moieties: Enhancing cell membrane permeability for living cell imaging
摘要： Three novel boron-dipyrromethene (BODIPY) dyes bearing borneol moieties have been designed, synthesized and characterized. The single-crystal structure of the compound 3 was also elucidated for the first time. Their photophysical properties and confocal fluorescence images were investigated by the optical spectroscopy and Confocal fluorescence microscopy. The results indicate that the compounds 2-3 take on high fluorescence quantum yield and cell membrane permeability, which can be utilized as fluorescent visualizers for cell and lysosome fluorescence imaging.
关键词： photophysical properties,borneol,cell imaging,BODIPY,membrane permeability
更新于2025-09-23 15:23:52
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Luminescence properties of a family of lanthanide metal-organic frameworks
摘要： Two isostructural series of lanthanide metal-organic frameworks denoted as SUMOF-7II (Ln) and SUMOF-7IIB (Ln) ( Ln = La, Ce, Pr, Nd, Sm, Eu, and Gd) were synthesized using4,4',4''-(pyridine-2,4,6-triyl)tris(benzoic acid) (H3L2) and a mixture of H3L2 and 4,4′,4′′-(benzene-1,3,5-triyl)tris(benzoic acid) (H3BTB) as linkers, respectively. Both series were characterized usingpowder X-ray diffraction (PXRD), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), thermal analysis (TGA), and photoluminescence spectroscopy. Photoluminescence measurements show that Eu-MOFs demonstrate a red emission while Pr- and Nd-MOFs display an emission in the near-infrared (NIR) range. On the other hand, La-, Ce-, Sm- and Gd-MOFs exhibit only a ligand-centered emission. The average luminescence lifetimes in the SUMOF-7IIBseries are 1.3-1.4-fold longer than the corresponding ones in the SUMOF-7II series. SUMOF-7IIs show a good photo- and thermal stability. Altogether, the properties of SUMOF-7II and SUMOF-7IIB render them promising materials for applications including sensing, biosensing, and telecommunications.
关键词： Lanthanide MOFs,Antenna Effect,Photostability,Photophysical Properties.,Metal-Organic Frameworks,Luminescence
更新于2025-09-23 15:23:52
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Photophysical Properties of Fluorescent Self-Assembled Peptide Nanostructures for Singlet Oxygen Generation
摘要： In this work, a drug delivery system for perillyl alcohol based on the peptide self-assembly containing 3-(2-benzothiazolyl)-7-(diethylamino)coumarin (C6) as a fluorescent additive is obtained, and its photophysical characteristics as well as its release dynamics were studied by steady-state and time-resolved fluorescence spectroscopy. Results proved the dynamics of drug release from the peptide nanostructures and showed that the system formed by the self-assembled peptide and C6, along with perillyl alcohol, presents unique photophysical properties that can be exploited to generate singlet oxygen (1O2) upon irradiation, which is not achieved by the sole components. Through epifluorescence microscopy combined with time-correlated single photon counting fluorescence spectroscopy, the release mechanism was proven to occur upon peptide structure interconversion, which is controlled by environmental changes.
关键词： photophysical properties,perillyl alcohol,drug delivery system,time-resolved fluorescence spectroscopy,fluorescent additive,peptide self-assembly,epifluorescence microscopy,singlet oxygen generation
更新于2025-09-23 15:21:01
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Photophysical Properties of Multilayer Graphenea??Quantum Dots Hybrid Structures
摘要： Photoelectrical and photoluminescent properties of multilayer graphene (MLG)–quantum dots (QD) hybrid structures have been studied. It has been shown that the average rate of transfer from QDs to the MLG can be estimated via photoinduced processes on the QDs’ surfaces. A monolayer of CdSe QDs can double the photoresponse amplitude of multilayer graphene, without influencing its characteristic photoresponse time. It has been found that efficient charge or energy transfer from QDs to MLG with a rate higher than 3 × 108 s?1 strongly inhibits photoinduced processes on the QD surfaces and provides photostability for QD-based structures.
关键词： photophysical properties,CdSe–ZnS quantum dots,hybrid structures,photoelectrical properties,multilayered graphene,photoactivation
更新于2025-09-23 15:19:57
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Environmentally Friendly InP-based Quantum Dots for Efficient Wide Color Gamut Displays
摘要： Quantum dots (QD) are regarded as ideal light emitters for current and next-generation displays. Hence, there is an urgent need to produce environmentally friendly QDs that show high efficiency and better color purity. From this perspective, a strategy of tuning the wavelength and spectral width is discussed to optimize the brightness and color space agreement. The critical parameters affecting photophysical properties, such as the uniformity of InP QD core, the thickness and shape of the ZnSe shell, the electron/hole distribution, surface dangling defects, oxidative phase, and the stacking faults in the crystalline structure, are examined. Also, quantitative analyses are suggested to understand the nature of the ligands so that practical applications can be diversified. Recently, the QD-LED using InP-based QDs with controlled shell structure showed a potential of future commercialization. As a further development, it is required to improve the stability via the control of inorganic and organic passivating structures.
关键词： Quantum dots,InP-based,QD-LED,photophysical properties,environmentally friendly,wide color gamut displays,ligand exchange
更新于2025-09-23 15:19:57
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Exploring the Relationship between Intermolecular Interactions and Solid-state Photophysical Properties of Organic Co-crystals
摘要： Five new binary co-crystals have been prepared through molecular self-assembly of π-electron-rich molecules like Phenanthrene (PHEN), Benzo[c]cinnoline (BCC) and Phenazine (PHNZ) in the presence of π-electron-deficient molecules like Tetrafluoro-1,4-benzoquinone (TFQ), Tetrachloro-1,4-benzoquinone (TCQ) and 1,2,4,5-Tetracyanobenzene (TCNB), taken in an equimolar ratio. Crystal structure analysis revealed that in three binary co-crystals the constituent molecules were alternately sandwiched in a cofacial arrangement through π···π interactions, while in the remaining two binary co-crystals the constituent molecules were aligned in a unique edge-to-face manner through lp···π interactions. Co-crystals with π-stacking arrangement were fluorescent, whereas almost complete quenching of luminescence was observed in those having edge-to-face alignment of molecules. The photophysical observations of these co-crystals have been demonstrated via energetic quantification of intermolecular interaction topology, which provides a molecular level understanding of factors controlling their solid-state absorption and luminescence behavior.
关键词： Magnetic,Organic Co-crystals,Plasmonics,Solid-state Photophysical Properties,Intermolecular Interactions,Optical,Hybrid Materials
更新于2025-09-23 15:19:57