No description available.

The use of bidentate ligands in organometallic chemistry is best illustrated by the successful application in homogeneous catalysis1 and bio-medical2 systems. For catalytic systems the use of bidentate phosphines have revolutionised the way in which homogeneous catalysis is viewed, with the use of functionalised organic ligands to induce favourable catalytic product formation such as the production of L-Dopa3. To this end, the investigation of tropolone type ligands and complexes will be discussed further in this chapter. The possible application of tropolone systems will be investigated in the context of possible catalytic and bio-medical applications. In 1945 Dewar4 predicted that 2-hydroxy-2,4,6-cycloheptatrien-one (Tropolone, Eq. 1.1.I), would show certain aromatic properties; he specifically referred to the natural products known at that time, stipitatic acid and colchicine5 as representative of this class of compounds. Thus Dewar was the first person to point to a new field in organic chemistry, which to date has not been fully explored due to the diversity of uses of tropolone and its derivatives. / Prof. A. Roodt

<p>U okviru doktorske disertacije predstavljene su elektronska i fononska struktura odabranih organometalnih materijala koji u svom sastavu imaju metale cink, kobalt ili bakar i organsko jedinjenje piridoksalaminogvanidin (PLAG). Predstavljene su realizacija i karakteristike organske svetleće diode zasnovane na najboljem od ispitivanih materijala. Urađena je detaljna analiza fotoluminescentnih spektara i njihovo razlaganje na proste komponente koristeći Lorencov model. Izvršeno je poređenje sa od ranije poznatim materijalom koji pokazuje visok stepen luminescencije. S obzirom da istraživanja vezana za organske svetleće diode uzimaju sve veći zamah i da ove diode postaju sve prisutnije u industrijskoj serijskoj proizvodnji, napravljena je detaljna analiza ove tehnologije i mehanizama koji se kriju iza nje. Urađeno je podrobno istraživanje kako na nivou elektrona u datim supstancama, tako i na nivou sloja organske svetleće diode. Na kraju je izvršena analiza rada diode sa integrisanim slojem sa materijalom koji u sebi sadrži cink i PLAG.</p> / <p>In this thesis electronic and phonon structure of specific organometallic<br />materials which have zinc, cobalt, copper metals and organic compound<br />pyridoxalaminoguanidin are presented. Implementation and characteristics of<br />organic light emitting diode based on the best material among examined<br />ones are also showed up. Detailed analysis of photoluminescence spectra<br />was done and its decomposition to its elementar components using<br />Lorentzian multipeak method. Comparison to well-known material that shows<br />high level of luminescence was implemented. In accordance to the fact that<br />research of organic light emitting diodes expands and that these diodes start<br />to be more present in industrial serial production, detailed analysis of this<br />technology and mechanisms behind it are made. Thorough research was<br />done both on electron level in these substances and organic light emitting<br />diode layer level. Finally, analysis of diode operation with integrated layer<br />made of material which includes zinc and pyridoxalaminoguanidin compound<br />is implemented.</p>

My thesis deals with the word order in the contemporary Czech language. The aim is to discover the principles that control the clause order within sentences and to find out to what extent the position of the main and subordinate clauses is fixed. The first section summarizes the work of Czech and Slovak linguists and introduces the principles that apply to the clause order in particular sentences. It defines types of sentences with fixed, usual and loose order. At the end of this part there is an overview of the positions of different types of clauses, which became the springboard for the empirical part. The second section deals with the clause order of selected subordinate sentences. I have chosen a representative sample of connecting expressions. Using materials of the Czech National Corpus I try to outline the contemporary Czech clause order of the most frequent types of clauses following these expressions.