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Normally dye molecules are adsorbed onto the nanocrystal (NC) surface in dye–NC mixed solution, but it is very unlikely that all dye molecules present in the solution will be attached to NCs. The distribution of dye molecules on the NC surface is an important factor to take into account while investigating the quenching of NC emission via energy transfer to adsorbed dye molecules. Here, we analysed...
A di-anchoring organic dye based on an acceptor–π spacer–donor–secondary donor–donor–π spacer–acceptor structural motif has been synthesized and used as a sensitizer for dye-sensitized solar cells (DSSCs). The new synthetic approach uses two π spacers, two acceptors and two different donors such as arylamino and carbazole units. The double donor–acceptor dye CBZ-3 is linked by a carbazole unit as...
Donor–Acceptor systems, in which a donor triphenylamine (TPA) directly connected to a corrole (Cor) acceptor (TPA-Cor) and separated by an ethynylphenyl bridge between TPA and Cor (TPA-E-Cor) have been designed, synthesized and fully characterized by elemental analysis, MALDI-MS, UV–Visible and 1 H NMR spectroscopic methods. A comparison of the UV–Visible and 1 H NMR features of these...
Novel light-activated antibacterial screen protectors were produced from commercially available protectors by a simple dye functionalization process. The screen protectors were shown to be effective against Escherichia coli and an epidemic strain of methicillin-resistant Staphylococcus aureus, EMRSA-16 under white light conditions. UV–vis spectroscopy and Fourier transform infrared spectroscopy showed...
Excited state spectral properties like fluorescence quantum yield, emission maxima and lifetime of 2-((7,8-dimethyl-1-oxo-2,3,4,9-tetrahydro-1H-carbazol-6-yl)oxy) acetic acid (DOTHCA) are markedly sensitive to polarity and the H-bonding ability of its immediate local environment. Inspired by the excited state properties of the molecule in homogeneous solvents, attempt has been made to investigate...
Riboflavin, a redox active chromophore commonly present in biological systems, undergoes photoinduced electron transfer with an aliphatic amine, triethylamine (TEA), both in singlet and triplet spin states. The extent of electron transfer is quite high in water compared to that in organized assemblies of β-cyclodextrin (β-CD) where Rf and TEA are confined in different regions of such heterogeneous...
Fish bones were converted into materials consisting of silver phosphate (Ag 3 PO 4 ), β-calcium phosphate (β-Ca 3 (PO 4 ) 2 , β-TCP) and hydroxyapatite (Ca 10 (PO 4 ) 6 (OH) 2 , HAp), as well as of metallic silver (Ag 0 ), with a simple treatment in solution and calcination (650 or 1000°C). The antibacterial activity of...
A general kinetic model for the photothermal oxidation of polypropylene has been derived from the basic auto-oxidation mechanistic scheme in which the main sources of radicals are the thermolysis and photolysis of the most unstable species, i.e hydroperoxides. Thermolysis is a uni- or bi-molecular reaction whose rate constant obeys an Arrhenius law. In contrast, photolysis is exclusively a unimolecular...
Membrane photocatalytic systems (MPS) can provide efficient separation of gaseous products in reactions of hydrogen production. In order to decrease permeability and improve products separation, Nafion was loaded on a MPS with the structure Pt/chemically loaded TiO 2 /filtration loaded TiO 2 /PTFE porous membrane/fibrous support. Influence of Nafion and ethanol amounts on MPS permeability,...
The paper deals with surface properties modifications of cryogels based on poly(vinyl alcohol) and cellulose during exposure to several doses of ultraviolet (UV) irradiation. Significant color changes were observed during UV exposure. The cryogels exhibited a fading trend with irradiation dose increase. Structures accumulated instable red chromophores and exhibited a yellowing tendency. The ultraviolet–visible...
The ability of γ-cyclodextrin to form ternary inclusion complexes has been utilized to mediate photo-heterodimerization between cinnamic acids and coumarins in the solid-state. Stabilizing steric and electronic interactions between the alkenes in the inclusion complex appear to be primarily responsible for directing the complexation toward the 1:1:1 hetero-guest pair complex. Photoexcitation of the...
If a molecule is distorted by steric factors or by its environment along a photochemically active coordinate, vertical excitation puts it to a down-slope in the upper state, so that it is accelerated into the same direction. If the photoreaction is barrierless or nearly so, this acceleration can be decisive for selecting one of several possible paths. This principle is used to explain the accordancy...
In this work, the effects of NaYF 4 :Yb 3+ , Tm 3+ (NYT) structure on the near-infrared light (NIR) photocatalysis performance of ZnO were investigated. α-NYT/ZnO nanocomposites (NCs) and β-NYT/ZnO NCs were fabricated by a high temperature decomposition reaction method. The prepared NCs were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), UV–vis...
The design, synthesis, and sensor activity of a novel highly water-soluble 9,10-dihydro-7H-imidazo[1,2-b]benz[d,e]isoqionolin-7-one derivative are reported. The changes in the photophysical properties of the compound as a function of pH were investigated in 100% aqueous medium. Novel compound manifests ratiometric “off–on–off” pH sensor activity. Due to the two different “off”-states, it is able to...
The fluorescence properties of five monobenzo-BODIPY compounds were measured in nonpolar and polar solvents by UV–vis absorption, steady-state fluorescence and time-correlated single-photon counting methods. These monobenzo-BODIPY dyes emit bright red fluorescence (wavelength >605nm) with high fluorescence quantum yields (Φ f ≥0.60) which are slightly affected by solvent polarity. The fluorescence...
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