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过滤筛选
- 2018
- electropolymerization
- polyporphyrin films
- quartz crystal microbalance method
- oxygen electroreduction.
- Applied Chemistry
- G.A. Krestov Institute of Solution Chemistry of RAS
- University Union Nicola Tesla
- Ivanovo State University of Chemistry and Technology
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Co-sensitization of porphyrin and metal-free dye for panchromatic dye-sensitized solar cells
摘要： Porphyrin dyes are outstanding photosensitizers. However, one of the limitations of using porphyrin dyes for dye-sensitized solar cells (DSSC) is their weak absorption in the 500–600 nm region. Co-sensitization approach with two complementary dyes is an approach to solve this problem. So, to enhance the DSSC performance by improving harvesting solar light, we have studied porphyrin dye (LD12) and an organic dye (D149) as the co-sensitizer. This co-sensitized LD12 + D149 device with complementary in their spectral responses shows the power conversion efficiency about 6.8%, which is higher compared with the individual LD12 and D149 solar cells. The obtained photon-to-current conversion efficiency (IPCE) by using this co-sensitized solar cell demonstrates a strong and broad spectral response. This improvement is due to increment of the dyes loading amounts, the fine-matched molecular structures and absorptions of both dyes as the co-sensitization system.
关键词： Dye-sensitized solar cells,Organic dye,Porphyrin,Co-sensitization
更新于2025-09-11 14:15:04
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Influence of the parameters in the preparation of silica nanoparticles from biomass and chemical silica precursors towards bioimaging application
摘要： Silica nanoparticles (SNP’s) occupy a prominent role in scientific research due to their easy preparation methodology and its wide uses in various applications. In this work, SNP’s were prepared from biomass (rice husk) and chemical precursor, tetraethoxysilane (TEOS) with the particle sizes of 50 nm and 200 nm respectively. The influence of particle size on varying the concentration of ethanol and water in Stober method of synthesis were also analysed. Since, porphyrin has the good electro and photo catalytic property, in this study, porphyrin NP’s was functionalized on the surface of the SNP’s. The functional groups were confirmed from FTIR spectra. From SEM analysis, it was observed that, the size of the SNP’s increased with increase in the concentration of ethanol. The optical dynamic properties of SNP’s functionalized with porphyrin NP’s were analysed from UV-Vis spectroscopy and Fluorolog. Further, the functionalization of SNP’s and their binding affinity were calculated by UV absorption spectra.
关键词： Porphyrin,Rice husk,photoluminescence,Silica nanoparticle
更新于2025-09-10 09:29:36
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Energy Transfer from CdSe/ZnS Nanocrystals to Tetraphenyl Porphyrin
摘要： CdSe/ZnS nanocrystals (NCs) and Tetraphenyl Porphyrin (TPP) are mixed uniformly to prepare CdSe/ZnS NCs/TPP complex. TPP can quench the fluorescent signal of CdSe/ZnS NCs. UV-Vis absorption spectra and fluorescence spectra are employed to analysis the energy transfer. The mechanism of energy transfer is the F?rster resonance energy transfer from CdSe/ZnS to TPP.
关键词： Tetraphenyl Porphyrin,energy transfer,CdSe/ZnS nanocrystals,F?rster resonance energy transfer
更新于2025-09-10 09:29:36
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Peculiar Photoinduced Electron Transfer in Porphyrin-Fullerene Akamptisomers
摘要： Porphyrin-fullerene dyads are promising candidates for organic photovoltaic devices. Electron transfer (ET) properties of the molecular devices depend significantly on the mutual position of the donor and acceptor. Recently, a new type of molecular isomerism (akamptisomerism) has been discovered. In the present study, we explore how photoinduced ET can be modulated by passing from one akamptisomer to another. To this aim, four akamptisomers of quinoxalinoporphyrin–[60]fullerene complex are selected for the computational study. The most striking finding is that, depending on the isomer, the porphyrin unit in the dyad can act as either electron donor or electron acceptor. Thus, the stereoisomeric diversity allows one to change the direction of ET between the porphyrin and fullerene moieties. To understand the effect of akamptisomerism on the photoinduced ET processes a detailed analysis of initial and final states involved in the ET is performed. The computed rate for charge separation is estimated to be in the region of 1-10 ns-1. The formation of a long-living quinoxalinoporphyrin anion-radical species is predicted.
关键词： quinoxalinoporphyrin–[60]fullerene complex,Porphyrin-fullerene dyads,photoinduced electron transfer,organic photovoltaic devices,akamptisomerism
更新于2025-09-10 09:29:36
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Photodegradation of metoprolol using a porphyrin as photosensitizer under homogeneous and heterogeneous conditions
摘要： Porphyrins are known as effective photosensitizers and can be an interesting key in phototreatment of water contaminated with micropollutants such as pharmaceuticals. They already showed to be efficient photocatalysts for the degradation of dyes, chlorophenols and other pollutants. This work demonstrates the applicability of 5,10,15,20-tetrakis(pentafluorophenyl)porphyrin (H2TF5PP) as photosensitizer for treatment of water contaminated with metoprolol, a highly prescribed β-blocker, which is not completely removed in sewage treatment plants. Studies were firstly developed under homogeneous conditions with simulated solar radiation and porphyrin was found to be efficient in the photodegradation of metoprolol, following a pseudo-first order kinetics with ca. 90% metoprolol degradation after 12 h. Experiments in presence of scavengers confirmed the mechanism of degradation via singlet oxygen. Appearance of several new peaks in HPLC chromatograms indicates the formation of products, identified by HPLC-MSn. Furthermore, the porphyrin was immobilized on a silica support and used as heterogeneous photocatalyst in degradation of metoprolol. Experiments using this heterogeneous photocatalyst under real solar irradiation were also performed, and similar results were obtained. Kinetic comparison of metoprolol photodegradation in buffer solution and in real wastewater treatment plant effluent showed that the efficiency of the immobilized porphyrin was not decreased by the complex matrix of the effluent.
关键词： Metoprolol,Wastewater,Porphyrin,Photodegradation,Photocatalysis
更新于2025-09-10 09:29:36
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Photophysical and photocatalytic properties of corrophyll and chlorophyll
摘要： Tetrapyrrolic macrocycles are well known photosensitizers, absorbing light in the ultraviolet and visible region. The quantum e?ciency of these naturally occurring compounds in optical processes, and the possibility of altering their behavior by modifying its constituent features, make them promising candidates for applications as Dye Sensitized Solar Cells (DSSC) and photocatalytic reactions. The time-dependent density-functional theory (TD-DFT) were used to study the optical and redox properties of chlorophyll and corrin-related molecules (corrophyll). The in?uence of the substituents and metallic atoms in their properties have been investigated. Our results show lower reduction potentials for corrophyll molecules compared with chlorophyll. The optical absorbance spectra of corrophyll without a metallic atom at their central rings shows a signi?cant blue-shift, as compared to their chlorophyll counterparts. The presence of Co(I) ion species at the corrophyll core leads to oxidation potentials below than that of water, which puts corrophyll ahead of traditional chlorophyll pigments as photocatalysts. We show that the substituents and the ions coordinated to the macrocycles play an important role in this phenomena. These ?ndings show the great potential of tuning the spectroscopic and reactive properties of tetrapyrrole macrocycles for applications in photocatalysis and optoelectronic devices, while keeping their essential structural features intact.
关键词： Corrole,Photophysics,Porphyrin,Electronic structure,TD-DFT,Optical absorbance,Photocatalysis
更新于2025-09-10 09:29:36
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Ultrasensitive Redox-responsive Porphyrin-based Polymeric Nanoparticles for Enhanced Photodynamic Therapy
摘要： Stimulus-sensitive nanoparticles (NPs) have been established to widely adapt to remarkable abnormalities under the tumor microenvironment, which can observably enhance the therapeutic efficiency, improve the specific targeting ability and reduce the side effects. Photodynamic therapy (PDT) as a promising non-invasive and selective treatment for cancers through photodynamic reaction can profit from stimulus-sensitive NPs. Herein, a harmonious amphiphilic polymer (PEG-b-PTPPDS-b-PEG) with an extremely sensitive redox response is constructed via click chemistry between N3-TPPC6-N3, PEG-N3 and alkynyl-containing disulfide ester for PDT. This polymer can be self-assembled into micelles with excellent stability, ultra-fast sensitivity of redox-triggered porphyrin release, and significant photodynamic anticancer performance. The redox-triggered dissociation of micelles and the release of porphyrin are much faster than common porphyrin-containing polymer. The bio-distribution and phototoxicity of micelles against A549 cells are measured and evaluated in vitro by flow cytometry, confocal scanning laser microscopy (CLSM) and MTT assay, respectively. The results reveal that PEG-b-PTPPDS-b-PEG micelles can effectively enhance the cellular uptake and cellular internalization of porphyrin and have an extremely low dark toxicity with efficient PDT towards A549 cells. This intracellular responsive nanoparticle provides a potential strategy for anticancer therapeutic application.
关键词： amphiphilic polymer,polymeric nanoparticles,porphyrin,photodynamic therapy,reduction-sensitive
更新于2025-09-09 09:28:46
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Building from Ga-porphyrins: Synthesis of Ga-Acetylide complexes using acetylenes and polyynes
摘要： Multidimensional, conjugated building blocks have been formed through the axial coordination of polyynes to the central Ga atom of tetraarylporphyrins. Electron deficient pentafluorophenyl substituents in the meso-positions provide more stable s-acetylide complexes to Ga than analogous structures with tert-butylphenyl groups. Mono-, di-, and triynes have been used, including a pyridyl endcapped diyne that allows for formation of porphyrin triads through coordination of the pyridyl ligand to a Ru porphyrin.
关键词： polyyne,axial s-acetylide,Ga-porphyrin,supramolecular assembly,hierarchical assembly
更新于2025-09-09 09:28:46
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Click synthesis of glycosylated porphyrin-cored PAMAM dendrimers with specific recognition and thermosensitivity
摘要： Glycoporphyrin dendrimers have received increasing attentions due to their distinct physical and chemistry properties, such as fluorescence and water solubility. They also acted as a promising photodynamic therapy (PDT) sensitizer and used in the study of carbohydrate-protein interaction. In this study, different generations of porphyrin-cored dendrimers consisting of glycosylated siloxane-poly (amido amine) typed dendron (PP-Si-PAMAM-Dm-Lac, m = 1, 2, and 3), multifunctional specific-targeting sensitizers, had been synthesized via click reaction. The structure of PP-Si-PAMAM-Dm-Lac was characterized by 1H NMR, GPC, FT-IR, UV-vis and fluorescence analyses. This glycoporphyrin dendrimers, not only obtained high fluorescence quantum yield and singlet oxygen production efficiency, but also showed specific recognition of lectin and remarkable temperature-responsive property (20–80 °C). These properties proved a facile click synthetic strategy of glycosylated siloxane-poly (amido amine) typed dendrimers with multiple functions as a promising tumor-selective photsensitizer (PS) for PDT and also allow applications in highly sensitive fluorescent probes over a larger temperature window.
关键词： Thermosensitivity,Glycosylated porphyrin,Dendrimers,PDT,Specific recognition
更新于2025-09-09 09:28:46
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A highly sensitive and selective “off-on” porphyrin-based fluorescent sensor for detection of thiophenol
摘要： Thiophenol and its derivatives easily cause damage to aquatic bioorganisms, animals and even human being, therefore, fluorescent probes for detecting thiophenol with sensitive and selective characters are highly popular. In this study, a highly sensitive and selective porphyrin-based fluorescent sensor (M1) was reported for detection of thiophenol based on the steric hindrance effect, where the recognition unit, 7-nitrobenzo[c][1,2,5]oxadiazolyl group is linked to aromatic ortho-position in the porphyrin, and correspondingly the fluorescence of fluorescein is efficiently quenched. Its time of fluorescence response for thiophenol was only 60s, and its fluorescence responses for the other anions/molecules were all far lower than the relative fluorescence ratio values for thiophenol, which means that the porphyrin-based fluorescent sensor is rapid, sensitive and selective to detection of thiophenol. This approach offers some useful insights for designing sensitive and selective fluorescent turn-on sensors in the detection assays for other analytes.
关键词： thiophenol,7-nitrobenzo[c][1,2,5]oxadiazolyl group,steric hindrance effect,the porphyrin-based fluorescent sensor
更新于2025-09-09 09:28:46