|
|
Organometallic polyacetylene networks
Šorm, David ; Sedláček, Jan (advisor) ; Balcar, Hynek (referee)
A new type of organometallic polymer networks with a covalent structure of cross-linked substituted polyacetylenes containing Cu2+ or Pd2+ ions (5 to 17 wt%) has been developed. The metal ions were complexed in the networks predominantly with two N-salicylideneaniline ligands covalently bound to two different network monomeric units. Due to the chosen method of complexation, the metal ions have actively participated (as knots of the network) in the formation of cross-linked architecture of the products. For the preparation of organometallic networks two independent methods were used: (i) the direct polymerization of organometallic monomers and (ii) the two-stage method using postpolymerization introduction of metal ions into polyacetylene polymers containing covalently bound N-salicylideneaniline proligands. The starting low-molecular-weight blocks used for the network synthesis were new substances prepared within the framework of the diploma thesis, namely monomers of the mono- and diethynylated N-salicylideneanilines type and diethynylated organometallic monomers in which two molecules of a monoethynylated N-salicylideneaniline complexed one Mt2+ ion. The ethynylated monomers were polymerized to organometallic networks or precursors of these networks via chain-growth coordination polymerization,...
|
|
|
New selective adsorbents and sensors based on microporous polymers with releasable links
Hašková, Alena ; Sedláček, Jan (advisor) ; Feltl, Ladislav (referee)
A new concept of Porous Organic Polymers (POP) of the type of hyper-cross- linked networks was implemented, in which the main (polyacetylene) chains were cross-linked both by permanent (biphenylene-type) and releasable (N-benzylideneaniline-type) links. It has been shown that the azomethine groups of the N-benzylideneaniline links of the networks can be readily and efficiently dissociated by means of hydrolysis or transmination. The dissociation of the azomethine groups accompanied by links releasing leads to a change in the covalent structure and texture of the networks. The composition of the networks has been optimized to maintain porous texture after releasing the N-benzylideneaniline links. Two possibilities of potential use of the new POP type for analytical chemistry applications have been studied. It has been shown that newly prepared POPs have a high capacity in the selective and reversible chemisorption of primary aromatic amines and hydrazines from solutions. The networks can be used repeatedly for these purposes, the chemisorption being carried out through transimination in the first use and through condensation of the aldehyde and amine groups in the subsequent uses. Thus, prepared POPs could potentially serve to extract primary aromatic amines from more complex mixtures of analytes....
|
|
| |
|
| |
|
| |
|
| |
|
| |
|
| |
|
|
In an Apartment in a small town, Mikulov
Nekolná, Alena ; Sedláček, Jan (referee) ; Hora, Jan (advisor)
The city's center is being exhausted at the expense of tourists and their earnings in Mikulov. More than residential houses build guest houses and other accommodation, classical housing is then set aside on the housing estate. Gradually, this phenomenon is signed on the quality of the city as a whole. It is also associated with gentrification, which is not always negative in the beginning, rather the opposite, but over time it can destroy the value of space. The oncept that my proposal is directed to is called Bilateral. It stems from the complexity of the non-orthogonal parcel, which is so characteristic of Mikulov. Just opening up the two streets leads to linking these two different places. Do not stack matter on one side of the street line, but use both as a functionally connected whole. Matter that does not turn back. An important motive is to fill a street break. Single-story building is out of scale. Follow the street line, lead it as a communication with the surroundings. Surroundings are also subject to a scale that divides the massive mass in the neighborhood of Comenius Street. Part of the mass descends to the lower street, the higher the mass prepares, the lower the gesture of the receding wall involved in the events. There is a street interior dedicated to a bakery and an open kitchen belonging to the restaurant with access from Husova Street. The restaurant is a bile hall accessible to all. The patio in the middle of the disposition connects the inhabitants and creates a community.
|
|
| |
guest ::
