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Charge Transport through Molecular Towers Based on Tetraphenyhmethane Tripods
Kolivoška, Viliam ; Šebera, Jakub ; Lindner, M. ; Valášek, M. ; Mayor, M. ; Mészáros, G. ; Gasior, Jindřich ; Hromadová, Magdaléna
Molecular platforms with multiple anchors were introduced recently to provide robusi coupling between molecular electronic components and metallic electrodes. In this work, charge transport in tower-shaped single molecule conductors based on tetraphenylmethane tripod possessing three thiol anchors is investigated by scanning tunneling microscopy break junction technique. The effect of tripod substitution pattern and number of repeating units in molecule is addressed. The substitution was found to influence conductance value in early stages of molecular junction evolution, where tower lays parallel to surface. In late stages, the charge is transported through principal molecular axis and junction breaks thermally in tilted configuration.
Charge Transport in Single Oligophenylene Molecular Wires with Different Anchoring Groups
Hromadová, Magdaléna ; Kolivoška, Viliam ; Šebera, Jakub ; Sebechlebská, Táňa ; Gasior, Jindřich ; Nováková Lachmanová, Štěpánka ; Mészáros, G. ; Lindner, M. ; Mayor, M. ; Valášek, M.
This work compares single molecule conductance measurements of selected organic systems containing identical oligophenylene molecular wires and different tripodal anchoring groups. Single molecule conductance G was obtained by a scanning tunneling microscopy break junction technique complemented by theoretical calculations based on the density functional theory and non-equilibrium Green’s function formalism. Two molecules were compared where the same oligophenylene wire is connected to one of the electrodes via a tripod substituted on each leg by a thiol group either in the meta or para position. By combined experimental and theoretical analysis it was possible to confirm that single molecule conductance in the metal-molecule-metal junction of both molecules corresponds to a fully extended molecular wire, which is attached to one of the electrodes by all three thiolate bonds of the tripod. Experimental results confirmed that G value of meta-connected molecules is lower than that of para, whereas junction formation probability was higher for meta functionalization.
Charge Transport in Single Oligophenylene Molecular Wires with Different Anchoring Groups
Hromadová, Magdaléna ; Kolivoška, Viliam ; Šebera, Jakub ; Sebechlebská, Táňa ; Gasior, Jindřich ; Nováková Lachmanová, Štěpánka ; Mészáros, G. ; Lindner, M. ; Mayor, M. ; Valášek, M.
This work compares single molecule conductance measurements of selected organic systems containing identical oligophenylene molecular wires and different tripodal anchoring groups. Single molecule conductance G was obtained by a scanning tunneling microscopy break junction technique complemented by theoretical calculations based on the density functional theory and non-equilibrium Green’s function formalism. Two molecules were compared where the same oligophenylene wire is connected to one of the electrodes via a tripod substituted on each leg by a thiol group either in the meta or para position. By combined experimental and theoretical analysis it was possible to confirm that single molecule conductance in the metal-molecule-metal junction of both molecules corresponds to a fully extended molecular wire, which is attached to one of the electrodes by all three thiolate bonds of the tripod. Experimental results confirmed that G value of meta-connected molecules is lower than that of para, whereas junction formation probability was higher for meta functionalization.
Charge Transport in Single Oligophenylene Molecular Wires with Different Anchoring Groups
Hromadová, Magdaléna ; Kolivoška, Viliam ; Šebera, Jakub ; Sebechlebská, Táňa ; Gasior, Jindřich ; Nováková Lachmanová, Štěpánka ; Mészáros, G. ; Lindner, M. ; Mayor, M. ; Valášek, M.
This work compares single molecule conductance measurements of selected organic systems containing identical oligophenylene molecular wires and different tripodal anchoring groups. Single molecule conductance G was obtained by a scanning tunneling microscopy break junction technique complemented by theoretical calculations based on the density functional theory and non-equilibrium Green’s function formalism. Two molecules were compared where the same oligophenylene wire is connected to one of the electrodes via a tripod substituted on each leg by a thiol group either in the meta or para position. By combined experimental and theoretical analysis it was possible to confirm that single molecule conductance in the metal-molecule-metal junction of both molecules corresponds to a fully extended molecular wire, which is attached to one of the electrodes by all three thiolate bonds of the tripod. Experimental results confirmed that G value of meta-connected molecules is lower than that of para, whereas junction formation probability was higher for meta functionalization.
Synthesis of modular components for molecular electronics
Valášek, Michal
This work is focused on synthesis of new modular components (molecular wires, insulators, diodes, sensors and self-assembled compounds), which may find application in molecular electronics. In the first part of this work, procedure for the preparation of "molecular wires", based on the oligomers of pyridinium salts, is described. The synthetic strategy is based on a stepwise prolongation of these rodlike molecules by reaction of terminal amino group with the monofunctional units. The series of pyridinim oligomers of well-defined length have been prepared without complicated separation of complex mixtures of oligomers. The following part of work describes synthetic approach for the preparation of pyridinium oligomers ending with alkylsulfanyl or acetylsulfanyl groups. These compounds are further used to study the conductivity of conjugated oligomers, after anchoring between the gold electrodes. The following section deals with the preparation of "molecular insulators" based on a rigid bicyclo[2.2.2]octane, 1,12-dicarba-closo-dodecaborane and 1,10-dicarba-closo- decaborane units. The next part deals with the preparation of a series of five "molecular diodes", where the acceptor part (pyridinium monomer) and donor part [(η4 -tetraarylcyclobutadiene)(η5 - cyclopentadienyl) cobalt complex] are mutually separated...
Life, Work and Contribution of Dr. Stanislav Šidlák.
Štěpánová, Václava ; Saláková, Magdalena (advisor) ; Valášek, Marek (referee)
The following bachelor thesis deals with the person and work of the cantor, director of elementary school, choirmaster, composer, pianist, and conductor PaedDr. Stanislav Šidlák (1904-1987), whose life is inherently connected with regions Trutnov, Úpice, and Malé Svatoňovice. This personality has become an important cultural promoter in the region of Northeastern Bohemia, specifically Sudet. He developed cultural events in the aforementioned location. He founded and led many choirs (e.g. the Vítězslav Novák choir), as well as vocal chamber groups, one of which was the internationally successful Dívčí pěvecké trio. He also acted as a conductor of the Strážkovická hornická hudba (a group typical of that region). For his ensembles, he edited a number of folk songs for various musical groups. As a composer he is the author of suites, cantatas, several vocal works for men's and mixed choirs, and an operetta (popular during that time) on the motifs of Božena Němcová's Pantáta Hájek. He not only led his ensembles but also actively participated as a regular member (e.g. Pěvecký sbor českých učitelů). He was also a sought-after tenor. This thesis deals not only with the life and musical and patriotic activities of Stanislav Šidlák (including correspondences with personalities such as Josef Bohuslav...
National Performance of the children's choirs
Lišková, Marie ; Valášek, Marek (advisor) ; Stříteská, Leona (referee)
This diploma thesis is addressing the "National Performance of the Children's Choirs" in former Czechoslovakia and Czech Republic. It aims to map its beginnings in the early 1990s and follows its subsequent course and changes, primarily from an administrative viewpoint. Special chapters focus on propositions and repertoire of the attending choirs; index of the repertoire is attached as a supplement. Key words children's choirs, parade, festival, choirmaster, children's choir compositions

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See also: similar author names
3 VALÁŠEK, Michal
1 Valášek, M.
1 Valášek, Marek
9 Valášek, Martin
3 Valášek, Michal
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