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Nanofiber materials simultaneously photogenerating NO and 1O2 species; Reversible NO binding on boron-containing clusters
Dolanský, Jiří ; Mosinger, Jiří (advisor) ; Klán, Petr (referee)
This project is concerned with the preparation of electrospun polystyrene (PS) nanofiber materials with covalently bonded NO-photodonor and electrostatically attached tetracationic porphyrinoid photosensitizers. These photofunctional nanofiber materials exhibit effective simultaneous photogeneration of small antibacterial NO and O2(1 ∆g) species under irradiation with daylight creating an antibacterial surface and near surrounding. NO species can be also generated just by gentle heating. Nanofiber materials were analyzed with SEM, FTIR, emission and UV/vis spectroscopy and time-resolved emission and absorption spetroscopy. The antibacterial effect was tested on Escherichia coli. The dual antibacterial action, in combination with the nanoporous character of the material that detains pathogens like bacteria on its surface, is ideal for any application where a sterile environment is neces- sary. The known bimetallic cluster system [(PMe2Ph)4Pt2B10H10] that possesses the propen- sity to reversibly bind small gaseous molecules (O2, SO2, CO) was synthesized in good yields for NO reversible binding investigation. Seven new monometallic precursors (Pt, Pd and Ni) to new bimetallic species were succesfully synthesized with the aim of future study of NO reversible binding. All new compounds were purified by...
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The surface modification of materials by polydopamine layer
Strmeň, Timotej ; Mosinger, Jiří (advisor) ; Havlíček, David (referee)
The bachelor thesis describes structure, main properties and possible applications of polydopamine (PDA). The main focus of the work lies in the description of uses of the PDA, including in detection of chemical substances, in energetics and in biomedicine. The short experimental section studies quality of deposition of the PDA depending on the deposition time and on the types of used nanofiber materials.
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Zirconium complexes with polyaminocarboxylate ligands
Hacaperková, Eliška ; Kubíček, Vojtěch (advisor) ; Mosinger, Jiří (referee)
This thesis is focused of zirkonium complex with polyaminocarboxylate li- gands. Formation kinetics of zirkonium complex with DTTAPPh ligand was stu- died by spectrophotometry and potentiometry with ISE electrode. According to both methods [Zr(DTTAPPh)] complex is formed rapidly (t99 % < 5 s). In the second part formation kinetics and stability of [Zr(DFO)] complex with fluo- ride anions were studied by potentiometry. For pH range 1-7 average number of fluoride anions coordinated to [Zr(DFO)] complex was determined. This de- pendence shows maxima at pH 3. Number of coordinated fluoride anions as function of increasing fluoride cincentration was studied at pH 3 and 5. Sta- bility of [Zr(DFO)(F)n] complex at fysiological pH was evaluated to determine usability of the complex in vivo.
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Photoactive Sulfonated Polystyrene Nanomaterials
Henke, Petr ; Mosinger, Jiří (advisor) ; Lang, Kamil (referee)
This thesis deals with the preparation and study of three new types of photoactive nanomaterials. Sulphonated polystyrene (PS) nanofiber layer with encapsulated photosensitiser 5,10,15,20-meso-tetraphenylporphyrin (TPP) inside the nanofibers and sulfonated PS nanofiber layers with surface-bound cationic photosensitiser (5,10,15,20- tetrakis(N-methylpyridinium-4-yl)porphyrin (TMPyP) and Sn(IV) (5,10,15,20-tetrakis(N- methylpyridinium-4-yl)porphyrin (TMPyP(Sn)). In addition to the spectral characteristics of these materials were studied ion exchange capacity and photogeneration of H2O2 and 1 O2. For all studied materials were using time-resolved spectroscopy monitoring of 1 O2 phosphorescence or delayed fluorescence of photosensitiser demonstrated 1 O2 photogeneration. H2O2 photogeneration detected by scopoletin fluorescence quenching was found in nanomaterials with surface-bound photosensitiser. Photobactericidal properties against E. coli were detected in all studied nanomaterials. Bactericidal properties were not recorded without the visible light irradiation. This shows that the bactericidal properties of nanofiber nanomaterials are caused by photogenerated 1 O2 or H2O2. Subject headings: photochemistry, photophysics, photocytotoxicity Keywords: singlet oxygen, hydrogen peroxide, nanofibers,...
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Complexes of metals as potential anion receptors
Marečková, Vendula ; Vojtíšek, Pavel (advisor) ; Mosinger, Jiří (referee)
An important class of anion receptors are based on bimetallic complexes with phenols bearing an pendant arms in 2,6-positions. A ligand of this type, 2,6-bis[(N- methylpiperazine-1-yl)methyl]-4-formyl phenol (L1), was prepared using the Mannich reaction. An attempt to prepare a similar compound L2 yield only an oily product. The molecular structure of compound L1 was determinated by X-ray diffraction. Comparison of the L1 structure with similar ones from CCDC showed important influence of the intramolecular H-bond on pendant arms orientations in this type of compounds. Further synthetic exploitation of the aldehyde group (in the position 4) was tested by reaction with 4-nitroaniline. The Shiff base (L3) was obtained but only as an oily substance. Reactions of L1 with Cu(ii) and Zn(ii) perchlorate or acetate produce complexes; the compound [Cu2L1(OH)(OAc)(H2O)]ClO4 (K1) was obtained in a crystallic form. The interactions of anion-bimetallic complex receptor were discused from stereochemical point of view using the structural data from CCDC in the last part of this work.
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The study of sulphonated polystyrene nanofabrics with encapsulated sensitizer
Hrdinková, Veronika ; Mosinger, Jiří (advisor) ; Vojtíšek, Pavel (referee)
The diploma thesis is dedicated to the exploitation of sulphonated polystyrene nanofibres as ion exchange nanomaterial. Ion exchange capacity of these nanomaterials has been determined by titration method and AAS. The effect of sulphonation on photophysical, photooxidative and photocytotoxic properties of sensitizer 5,10,15,20-meso- tetraphenylporphyrin (TPP) encapsulated in polystyrene nanofibres has been studied as well. Properties of TPP have been examined with time-resolved spectroscopy, photooxidation of uric acid as substrate and bactericidal tests on Escherichia coli DH5α with pGEM11Z plasmid. It has been discovered that following the sulphonation of the nanofabrics, the encapsulated sensitizer is partly present even in aggregation form. The polystyrene nanofabrics with encapsulated sensitizer keep its bactericidal efficiency also after sulphonation.
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