|
|
Spectroscopy study of metal complexes with terpyridyl ligands
Kožíšek, Jan ; Šloufová, Ivana (advisor) ; Procházka, Marek (referee)
The work is focused on preparation and characterization of octahedral Fe(II) complexes of 2,2′:6′,2′′-terpyridine (tpy) substituted in 4' position by various groups: Cl (tpyCl), chlorophenyl (tpyPhCl) and 2-thienyl (Ttpy)). Formation and stability of prepared complexes were studied by UV/vis spectroscopy on the basis of titration of tpy ligands by Fe(II) ions. The molar absorption coefficient of the metal-to-ligand charge transfer (MLCT) band was found to increase in the order: tpy < tpyCl < tpyPhCl < Ttpy. The MLCT band position increases in the same order, starting from 551 nm for [Fe(tpy)2]2+ to 576 nm for [Fe(Ttpy)2]2+ . Raman scattering (RS) spectra of tpy ligands were obtained upon non-resonance 780 nm excitation. Four excitation wavelengths (445, 532, 633 a 780 nm) were used for measurement Fe(II) complexes. The excitation profiles of both Raman scattering and surface-enhanced Raman scattering (SERS) spectra were constructed for [Fe(tpyCl)2]2+ complex. On the basis of DFT calculations performed for this complex, the Raman active modes have been assigned to the symmetry species of the D2d point group. Similarly as for the previously studied [Fe(tpy)2]2+ complex, activation of E modes in the region of MLCT band suggests contribution of Herzberg-Teller mechanism to the overall molecular...
|
|
|
Monitoring of surface reactions on plasmon nanoparticles by surface-enhanced Raman spectroscopy
Kožíšek, Jan ; Šloufová, Ivana (advisor) ; Procházka, Marek (referee)
The presented diploma thesis is focused on finding conditions suitable for the study of surface reactions, especially Suzuki-Miyaura cross-coupling reaction (SMCR), by the surface- enhanced Raman scattering (SERS) method. The first part of the work deals with the optimization of the conditions of individual reactions using the classical synthetic Schlenk technique. Traditional, published, conditions for SMCR were gradually modified during the work so that the reactions could be performed in aqueous media and at room temperature, i.e., under conditions suitable for SERS spectroscopy. The following catalysts were tested: (i) PEPPSI - the traditional SMCR catalyst; (ii) palladium ions; (iii) Pd colloids; (iv) bimetallic colloids of Pd and plasmonic metal (Ag, Au) in the form of core-shell and alloy; (v) Ag and Au colloids with additions of palladium salt or N- heterocyclic carbenes (NHC-catalysts). Two groups of substrates were used: substrates with functional groups with high affinity for the surfaces of metal nanoparticles (NPs) and substrates without these anchoring functional groups. Substrates without the anchoring functional groups can be expected to enter the SMCR reaction from solution. In the second part of this diploma thesis selected reaction mixtures for SMCR were performed in septum...
|
|
|
Spectroscopy study of metal complexes with terpyridyl ligands
Kožíšek, Jan ; Šloufová, Ivana (advisor) ; Procházka, Marek (referee)
The work is focused on preparation and characterization of octahedral Fe(II) complexes of 2,2′:6′,2′′-terpyridine (tpy) substituted in 4' position by various groups: Cl (tpyCl), chlorophenyl (tpyPhCl) and 2-thienyl (Ttpy)). Formation and stability of prepared complexes were studied by UV/vis spectroscopy on the basis of titration of tpy ligands by Fe(II) ions. The molar absorption coefficient of the metal-to-ligand charge transfer (MLCT) band was found to increase in the order: tpy < tpyCl < tpyPhCl < Ttpy. The MLCT band position increases in the same order, starting from 551 nm for [Fe(tpy)2]2+ to 576 nm for [Fe(Ttpy)2]2+ . Raman scattering (RS) spectra of tpy ligands were obtained upon non-resonance 780 nm excitation. Four excitation wavelengths (445, 532, 633 a 780 nm) were used for measurement Fe(II) complexes. The excitation profiles of both Raman scattering and surface-enhanced Raman scattering (SERS) spectra were constructed for [Fe(tpyCl)2]2+ complex. On the basis of DFT calculations performed for this complex, the Raman active modes have been assigned to the symmetry species of the D2d point group. Similarly as for the previously studied [Fe(tpy)2]2+ complex, activation of E modes in the region of MLCT band suggests contribution of Herzberg-Teller mechanism to the overall molecular...
|
|
|
Privatization under the Margaret Thatcher
Kožíšek, Jan ; Kovář, Martin (advisor) ; Johnson, Zdenka (referee)
The theme of the thesis is privatization process that took place in the 1980s under Prime Minister Margaret Thatcher. First, the thesis deals with the post war British economy, where the nationalization of industry took an important part in the second half of the 1940s and the gradual strengthening of state power in the following years. Next topics includes the economic situation at the beginning of Thatcher as a Prime Minister in office, the challenges she faced and the circumstances that led to a series of economic reforms, where one of the most important was the privatization of state enterprises. The thesis looks at why it happened and explores the problems associated with the regulation of privatized industries. In conclusion are discussed positive and negative impacts of privatization on the British economy and privatized companies, and its impact on unemployment in the 1980s. The aim is to examine why the privatization occurred and why its effects were ambiguous.
|
|
|
Analysis of Prerov's budgets in years 2006 - 2010 and the impacts of economic crisis 2008/2009 on its budget
Kožíšek, Jan ; Peková, Jitka (advisor) ; Jílek, Petr (referee)
This paper analyses the budget and financing of the municipalities in the Czech Republic, focuses on the budget structure of the municipality, elaborates on the specifics of municipal financial management. On the example of Prerov town and its financial management this paper shows these aspects in reality. Prerov's financial management analysis is based on the monitoring of its final accounts from the years 2006 -- 2010. In the years 2008 -- 2009 the Czech Republic was affected by global economic crisis. This paper aims to discover what was the impact of the crisis on the Prerov's financial stability and debt.
|
guest ::
RSS feed.