Národní úložiště šedé literatury Nalezeno 50 záznamů.  začátekpředchozí21 - 30dalšíkonec  přejít na záznam: Hledání trvalo 0.00 vteřin. 
Synthesis of Amidoazaphenacenes for Applications in Organic Molecular Electronics.
Váňa, Lubomír ; Storch, Jan ; Církva, Vladimír
This work is focused on preparation of amidoazaphenacenes by photocyclization of various ortho-chloro-substituted aromatic amides. Their amide functional groups can make hydrogen bonds, which have a positive effect on formation of a stable supramolecular structure to facilitate the charge carrier transport in thin solid film.\n
Plný tet: SKMBT_C22017111612581 - Stáhnout plný textPDF
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Photochemical Synthesis of Aza-aromatic Compounds.
Kos, Martin ; Žádný, Jaroslav ; Storch, Jan ; Sýkora, Jan ; Církva, Vladimír
Herein we report synthesis of series of novel both aza- and diaza-helicenes, and phenacenes, which were prepared mainly by photocyclization of corresponding imine precursors. Reaction conditions of photocyclization (i.e. solvent, photocatalyst, type of irradiation, use of water scavenger) were optimized and enhanced. Usage of TEMPO as oxidizing agent leads to improvement of yields up to 72 %. Prepared 2-pyridyl substituted azaphenacenes will be utilized for preparation of potential semiconductive layers in cooperation with IMC of the CAS.
Plný tet: SKMBT_C22017111612580 - Stáhnout plný textPDF
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Transition-Metal Complexes with Helical Phosphines.
Beránek, Tomáš ; Žádný, Jaroslav ; Sýkora, Jan ; Storch, Jan
In this work the synthetic pathways were investigated to provide other suitable phosphine derivatives of [6]helicene and their transition metal complexes. Attempts on enantiomeric resolution of prepared helicenes and synthesis of their transition-metal complexes were also done.
Plný tet: SKMBT_C22017111612590 - Stáhnout plný textPDF
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Potential-driven On/Off Switch Strategy for the Electrosynthesis of [7]Helicene-derived Polymers.
Žádný, Jaroslav ; Storch, Jan ; Strašák, Tomáš ; Církva, Vladimír ; Hrbáč, J. ; Fekete, Ladislav ; Pokorný, Jan ; Bulíř, Jiří ; Vacek, J.
3-([7]H elicen-9-yl)-thiophene hybrid monomer was electrooxidized in acetonitrile by cyclic voltammetry with anodic potential limits of +1.5 V or +2.5 V, resulting in a conductive and non-conductive polymer, respectively. The electrochemical findings were supplemented by microscopy investigations; UV-Vis, fluorescence and vibrational spectroscopies, ellipsometry measurements and computational chemistry. The electrodeposited polymers could be used for the further development of materials applicable in organic electronics and sensing technologies.
Plný tet: SKMBT_C22017111612582 - Stáhnout plný textPDF
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Preparation of Partially Fluorinated Polyaromatics by Photocyclization of Stilbenes.
Jakubík, Pavel ; Storch, Jan ; Žádný, Jaroslav ; Pfleger, Jiří ; Církva, Vladimír
Synthetic strategies to partially fluorinated polyaromatics by photocyclization were examined, leading to both 1,2,3,4-tetrafluoro[6]helicene (1) and 1,2,3,4,13,14,15,16-octafluoro[6]helicene (2), and to 1,2,3,4-tetrafluoro[5]phenacene (3) and 1,2,3,4-tetrafluoro[6]phenacene (4). Thin films of the prepared compounds were characterized for their electrical properties and incorporated into OFET structures.
Synthesis of Helicene-based Imidazolium Salts.
Jakubec, Martin ; Storch, Jan
In this work, an optimized synthesis of [6]helicenoimidazole was developed. The compound was characterized and its reactivity furnishing conveniently substituted imidazolium salts was explored.
Plný tet: SKMBT_C22017111612591 - Stáhnout plný textPDF
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A Short Overview of the Electrochemistry of Helical Polyaromatics.
Vacek, J. ; Hrbáč, J. ; Zatlouklová, M. ; Storch, Jan
Here we describe the electrochemical behavior of a group of polyaromatics designated helicenes. These compounds are finding many applications in optoelectronics, catalysis and chiral separation. Thus it is important to investigate the electrochemical and optical behavior of helicenes with respect to improving their application potential and our knowledge of strategies for their surfaces immobilization. Electrochemical analyses were performed in acetonitrile and in aqueous media with glassy carbon and indium tin oxide electrodes. Specifically, [n]helicenes and their salts 1-buty1-3-(2-methy1[6]heliceny)-immidazolium bromide and 3-([7]helicene-9-y1)thiophene were investigated, the application of acquired electrochemical data is disussed, especially in terms of optoelectronics and the construction of semi-conductive devices.
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Ruthenium (II) Complexes with 6,7-Diaza[5]phenacene.
Beránek, Tomáš ; Žádný, Jaroslav ; Jakubík, Pavel ; Církva, Vladimír ; Storch, Jan
In this work we focused on preparation of novel bidentate and fully aromatic N,N-ligand and its ruthenium complexes. 6,7-Diaza[5]phenacene (1) was synthetized from 4-bromoisoquinoline by microwave-assisted tandem Hyama-Heck cross coupling reaction3 followed by photocyclization (Scheme 1). With 6,7-diaza[5]phenacene (1) in our hand, we prepared some new ruthenium(II) complexes (e.g. 2) , characterized them from structural point of view and determined some of their electronic and optical properties with regard to their application potential.
Plný tet: SKMBT_22316112114160 - Stáhnout plný textPDF
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