National Repository of Grey Literature 79 records found  1 - 10nextend  jump to record: Search took 0.00 seconds. 
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
Pribram Choirs Today and Their Impact on the Cultural Life of the City
Štefaniková, Marie ; Bělohlávková, Petra (advisor) ; Valášek, Marek (referee)
Foreign language resume The nowadays Příbram choruses and their influance on the cultural life in our town is the topic of my diploma work. The interpretation of this work wants to show all the functions of the choruses and their activities in the last time, but mainly in the contemporary one. Příbram is the town with rich history. It has about 35 000 inhabitans. It's situated 60 km south-west of Prague. In past (from the 60. years of the 19-th century) was cultural and social centre of region. Thanks to many successful people - artists, scientists and excellent artistic bodies it was called "The Brdy Athene". Among known music bodies belong three choruses - "Příbramský smíšený sbor" (in the past called "Lumír - Dobromila"), "Svatohorský chrámový sbor" and "Příbramský dětský sbor" dated from 1939. In this diploma work The history of "old" choruses, but also the "new" ones - based duringeighties of the last century such as "Codex Temporis", "Komorní smíšený sbor Dr. Vl. Vepřeka, "Komorní pěvecký sbor Mistra Jakoubka ze Stříbra", children choruses by ZŠ 28. října, ZŠ Školní and ZUŠ T. G. M., is described in this diploma work. Every chorus has its own separate subchapter describing it's activities. In general, the theme of chorus in Příbram has its unique form and content. But in this time nine choruses (5...
Investigation of Single Molecule Charge Transport Properties and Geometrical Arrangement in Terpyridine Architectures Supported by the Tetraphenylmethane Tripod
Kolivoška, Viliam ; Sebechlebská, Táňa ; Šebera, Jakub ; Gasior, Jindřich ; Lindner, M. ; Lukášek, J. ; Valášek, M. ; Mayor, M. ; Mészáros, G. ; Hromadová, Magdaléna
Tripodal platforms were engineered recently to realize a well-defined directional contact between metallic electrodes and molecular architectures dedicated to serve as working elements for electronic applications. In this work we employ cyclic voltammetry, scanning tunneling microscopy break junction technique and theoretical approaches based on the combination of density functional theory and non-equilibrium Green´s function to investigate the geometrical arrangement and single molecule charge transport in terpyridine-based architectures supported by tetraphenylmethane tripod. We demonstrate that this architecture adopts a favorable geometrical arrangement capable of forming highly conductive molecular junctions and is thus suitable to serve as a basis for working molecular switches.

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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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