Synthesis, photophysical and photochemical characterization of new organic chromophores
Provider: Ministerstvo školství, mládeže a tělovýchovy
Programme: Rakousko - AKTION
Implementation period: 01.01.14 - 31.12.15
Workplace:
Team member: Machalický Oldřich
Description:
The research team of Dr. Al Monasy deals more than ten years with syntheses and with the study of photophysical properties of bi-and trichromophoric systems based on polycyclic aromatic amines. Such chromophores are interesting mainly for the possibility of their use as model compounds for the study of EET. However, Pardubice research team laboratories are specialized mainly on the syntheses and characterization of organic compounds; therefore the detail study of properties of these compounds is limited especially as for the further studies in terms of the kinetics of photoinduced electron transfer reactions, photophysical properties, photoconductivity, electrochemical measurements such as cyclic voltammetry, etc. For this reason such studies will be carried out by a team of Prof. Grampp in Graz. Current activities of the research team in Pardubice are focused on the synthesis of chromophoric systems with some potential for their application in electronics and optoelectronics (OLEDs). The operational objective of the project is therefore the synthesis and characterization of new types of organic chromophores and the study of their properties in terms of their application in these areas. Large series of the prepared compounds show fluorescence. Measurements of absorption and fluorescence spectra will be carried out in Pardubice, the kinetics of fluorescence quenching experiments together with the electrochemical investigations will be performed in Graz. The reduction/oxidation potentials of the new synthesized compounds will be measured in different solvents using mainly Cyclic Voltammetry. According to the electrochemical results corresponding electron donor-acceptor pairs will be elected for studies of the photo-induced energy or electron transfer reactions. This will be performed by using time-resolved laser spectroscopy. Depending on the photo-physical properties of the new compounds especially their inter-system crossing yields, magnetic field dependent measurements will be performed to get more detailed information about singlet-triplet conversion. For the compounds exhibiting dual fluorescence, the dynamics of fluorescence quenching will also be studied in Graz. To get more detailed information about the reaction mechanisms involved, especially the appearance of short-living radical intermediates, we plan time-resolved Electron-Spin-Resonance (ESR-CIDEP) measurements. From the results of such experiments one can deduce the multiplicity of the precursor state of the reaction. From the ratio of the absorption- and/or emission ESR-hyperfine lines it is possible to distinguish between singlet or triplet reaction behaviour.
The research team of Dr. Al Monasy deals more than ten years with syntheses and with the study of photophysical properties of bi-and trichromophoric systems based on polycyclic aromatic amines. Such chromophores are interesting mainly for the possibility of their use as model compounds for the study of EET. However, Pardubice research team laboratories are specialized mainly on the syntheses and characterization of organic compounds; therefore the detail study of properties of these compounds is limited especially as for the further studies in terms of the kinetics of photoinduced electron transfer reactions, photophysical properties, photoconductivity, electrochemical measurements such as cyclic voltammetry, etc. For this reason such studies will be carried out by a team of Prof. Grampp in Graz. Current activities of the research team in Pardubice are focused on the synthesis of chromophoric systems with some potential for their application in electronics and optoelectronics (OLEDs). The operational objective of the project is therefore the synthesis and characterization of new types of organic chromophores and the study of their properties in terms of their application in these areas. Large series of the prepared compounds show fluorescence. Measurements of absorption and fluorescence spectra will be carried out in Pardubice, the kinetics of fluorescence quenching experiments together with the electrochemical investigations will be performed in Graz. The reduction/oxidation potentials of the new synthesized compounds will be measured in different solvents using mainly Cyclic Voltammetry. According to the electrochemical results corresponding electron donor-acceptor pairs will be elected for studies of the photo-induced energy or electron transfer reactions. This will be performed by using time-resolved laser spectroscopy. Depending on the photo-physical properties of the new compounds especially their inter-system crossing yields, magnetic field dependent measurements will be performed to get more detailed information about singlet-triplet conversion. For the compounds exhibiting dual fluorescence, the dynamics of fluorescence quenching will also be studied in Graz. To get more detailed information about the reaction mechanisms involved, especially the appearance of short-living radical intermediates, we plan time-resolved Electron-Spin-Resonance (ESR-CIDEP) measurements. From the results of such experiments one can deduce the multiplicity of the precursor state of the reaction. From the ratio of the absorption- and/or emission ESR-hyperfine lines it is possible to distinguish between singlet or triplet reaction behaviour.
