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Natural flavonoids as potential photosensitizers for dye-sensitized solar cells

Zdyb Agata, Krawczyk Stanisław

Ecological Chemistry and Engineering. S

2019

Vol. 26, nr 1

29--36

Natural flavonoids quercetin, morin, fisetin and luteolin were studied as potential photosensitizers for dye-sensitized solar cells (DSSC). Spectroscopic methods were used to investigate the formation of dye/TiO2 nanoparticles assemblies and the development of their absorption spectra. The results show that the flavonoids adsorb well on TiO2 nanoparticles and this process causes the shift of absorption spectra from the near UV into the visible range of solar light. The mode of binding of the dye molecules on TiO2 surface is analyzed by comparison of spectral absorption properties and with the use of structural differences introduced by fisetin and luteolin for discrimination between several possibilities.

Synteza i charakterystyka purynowo-ftalocyjaninowego koniugatu jako potencjalnego fotosensybilizatora

Kryjewski M., Czarczyńska-Goślińska B., Nowak M., Teubert A., Mielcarek J., Gośliński T.

Przemysł Chemiczny

2015

T. 94, nr 5

781-783

Dokonano syntezy ftalocyjaniny cynku(II) podstawionej ugrupowaniami 3-(pentyloksykarbonylo) propoksylowymi i 2-(1,9-dihydro-6H-puryn-6-on-9-ylo)etoksylowymi. Barwnik scharakteryzowano z wykorzystaniem spektrometrii mas, spektroskopii UV-VIS oraz różnych technik NMR.

6-Methylthiopurine was substituted at the N9 position with BrCH₂CH₂OH in HCONMe₂, at 65°C and etherified with 3-nitrophthalonitrile in Me₂SO at 40°C. The phthalonitrile derivative and 3,6-bis[3-(ethoxycarbonyl)propoxy]-1,2-benzenedicarbonitrile were subjected to the macrocyclization in presence of 1,8-diazabicyclo[5.4.0]undec-7-ene and Zn(OAc)2 in n-pentanol at 110°C to yield a green zinc(II) {1,4,8,11,15,18-hexakis-bis[3-(pentoxycarbonyl)propoxy]-22-[1,9-dihydro-6H-purin-6-on-9-yl)ethoxy]phthalocyanine pigment and a known zinc(II){1,4,8,11,15,18,22,25-octakis[(3-pentoxycarbonyl)propoxy]phthalocyanine as a by-product. The purine-phthalocyanine conjugate was characterized by mass spectrometry, UV-VIS spectroscopy and various NMR techniques.

Sol-gel coated fiberoptic applicator for photodynamic medicine - optical and AFM characterization

Kopaczyńska M., Hołowacz I., Ulatowska-Jarża A., Buzalewicz I., Podbielska H.

Biocybernetics and Biomedical Engineering

2012

Vol. 32, no. 1

41-50

The application of spectroscopic study, microscopic and AFM imaging for examination of fiberoptic applicators is presented. The potential carriers of photoactive agents for photodynamic medicine in form of sol-gel coatings of fiberoptic applicators, are proposed. Optical and morphological properties of the proposed sol-gel coatings doped with photosensitizer Photolon, are characterized. The influence of pH and oxygen changes on entrapped Photolon properties, was examined, as well. The morphology of the applicator coating was examined by using atomic force microscopy. The light distribution from an applicator was studied by means of computer aided image analysis.