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Wyszukujesz frazę "Kityk, Andriy" wg kryterium: Autor


Tytuł:
Synthesis, spectral properties and DFT/TDDFT study on novel methyl heteroazulene derivative
Autorzy:
Matusiewicz, Marek
Danel, Krzysztof S.
Gąsiorski, Paweł
Kityk, Andriy V.
Uchacz, Tomasz
Opis:
Paper introduces new heteroazulene derivative, 10-methoxy-6-methyl-6 H -5,6,7-triazadibenzo[ f,h ] naphtho[3,2,1- cd ]azulene (MMTNA), including chemical aspects of its synthesis likewise optical absorption and fl uorescence spectra measured in several organic solvents of different polarity. The obtained experimental results are subjected to the quantum-chemical analysis based on DFT/TDDFT/PCM calculations at the B3LYP/6-31 þ G(d,p) level of theory. MMTNA demonstrates insigni fi cant sol- vatochromism of both fi rst absorption and fl uorescence bands caused mainly by a weakly polar feature of its ground and lowest excited states. Despite this the emission bands appears to be considerably red shifted with respect to relevant fi rst absorption bands resulting thus to a substantial Stokes shift. Its origin is dominated by the conformational relaxation in the excited state whereas the solvent relaxation has practically no in fl uence on the emission spectra. Low sensitivity to the host environment makes MMTNA dye perspective for a number of applications, particularly in those cases when a high stability of the emission wavelength (color) is demanded.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
DFT/TDDFT study on the electronic structure and spectral properties in annulated analogue of phenyl heteroazulene derivative
Autorzy:
Piątek, Łukasz
Matusiewicz, Marek
Danel, Krzysztof S.
Kuźnik, Wojciech
Gąsiorski, Paweł
Kityk, Andriy V.
Uchacz, Tomasz
Opis:
Paper reports the DFT/TDDFT study on the electronic structure and spectral properties of the seven- membered annulated heteroazulene derivative 6-phenyl-6 H -5,6,7-triazadibenzo[ f,h ]naphtho[3,2,1- cd ]azulene (PTNA) by means of polarizable continuum model (PCM) and Lippert–Mataga–Onsager reaction field (LM-ORF) model at the B3LYP/6-31+G(d,p) level of theory. The results of calculations are compared with the measured optical absorption and fluorescence spectra as well as with the cyclic voltammetry data. The DFT/TDDFT methods exhibit rather good quantitative agreement regarding the spectral position of the first absorption band; the discrepancy between the experiment and theory is less than 0.1 eV. As for the fluorescence emission the TDDFT calculations underestimate the transition energy of about 0.45 eV. The discrepancy should be attributed to insufficient accuracy of the TDDFT opti- mization in the excited state. In the polar solvent environment, all the TDDFT/PCM approaches give the bathochromic (red) shift for the fluorescence emission and the hypsochromic (blue) shift for the optical absorption in accordance with the experimental observation. As for the fluorescence emission fairly good agreement with the experiment provides the hybrid approach being the combination of the TDDFT/PCM optimization with the semiempirical electronic structure calculations by PM3 method and solvation LM- ORF model predicting the emission energy in different solvents with the accuracy better than 0.06 eV.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł

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