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Wyszukujesz frazę "Waluk, J." wg kryterium: Wszystkie pola


Wyświetlanie 1-4 z 4
Tytuł:
Light-Induced Tautomerization in Porphyrin Isomers
Autorzy:
Waluk, J.
Powiązania:
https://bibliotekanauki.pl/articles/1993612.pdf
Data publikacji:
1999-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
33.20.-t
33.50.-j
78.55.-m
78.60.-b
Opis:
Double proton tautomerization occurring in porphyrin and its structural isomers represents a special case of a chemical transformation in which the substrate and the product are form ally the same. The methods used for the investigation of this kind of processes are based on polarized spectroscopy and high-resolution techniques, such as matrix isolation. Their combined use results in obtaining information pertinent to the mechanism of proton transfer, regarding e.g., the values of proton transfer rates, structure of the tautomeric forms or the shape of the potential energy surfaces. In addition, these procedures provide a way of obtaining spectral, photophysical and structural data that would be otherwise difficult to gain. The examples include determination of transition moment directions, assignment of electronic and vibrational states, elucidation of the character of the substitutional replacement of the rare gas matrix atoms by the chromophore, and the analysis of the nature of the symmetry lowering due to the matrix cage.
Źródło:
Acta Physica Polonica A; 1999, 95, 1; 49-62
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electronic States and Structure of Dibenzo[j,lm]-phenanthro[5,4,3-abcd]perylene
Autorzy:
Marczyk, J.
Waluk, J.
Fetzer, J.
Powiązania:
https://bibliotekanauki.pl/articles/1933561.pdf
Data publikacji:
1995-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
07.65.-b
33.20.-t
33.10.-n
Opis:
Electronic absorption and emission, fluorescence anisotropy and linear dichroism techniques were applied to dibenzo[j, lm]phenanthro[5,4,3-abcd]perylene in order to determine its electronic structure and check the possibility of existence of conformational isomers. The results indicate the presence of only one conformer. Its structure is proposed on the basis of the experimental data as well as molecular mechanics and quantum chemical calculations.
Źródło:
Acta Physica Polonica A; 1995, 88, 2; 295-304
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spectroscopy and Photophysics of 3'-[p-(dimethylamino)phenyl]spiro-[fluorene-9,4'-oxazolidine]-2',5'-dione
Autorzy:
Dobkowski, J.
Kołos, R.
Waluk, J.
Powiązania:
https://bibliotekanauki.pl/articles/1933606.pdf
Data publikacji:
1995-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
33.10.-n
Opis:
Electronic absorption and emission spectroscopy of the title molecule has been studied in solution, low-temperature glasses and polymer matrices. No luminescence could be observed down to 77 K. In the presence of water, the formation of the hydrated species was observed, accompanied by the appearance of phosphorescence. The structure and spectra of both forms were calculated using molecular mechanics and quantum chemical methods. The lack of phosphorescence in the anhydride is interpreted as due to proximity effects in the triplet manifold.
Źródło:
Acta Physica Polonica A; 1995, 88, 3; 445-454
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Conformation-Dependent Photophysics of Bifunctional Hydrogen Bond Donor/Acceptor Molecules
Autorzy:
Kijak, M.
Petkova, I.
Toczek, M.
Wiosna-Sałyga, G.
Zielińska, A.
Herbich, J.
Thummel, R.
Waluk, J.
Powiązania:
https://bibliotekanauki.pl/articles/1814016.pdf
Data publikacji:
2007-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
33.15.-e
02.70.-c
Opis:
A series of heteroazaaromatic molecules possessing both a hydrogen bond donor and acceptor groups linked by a single bond was studied using electronic absorption and fluorescence techniques, combined with quantum-chemical calculations. Fluorescence lifetimes and quantum yields strongly depend on the solvent. Double exponential decays are observed in alcohols. This was interpreted in terms of alcohol-induced syn-anti rotamerization in the ground electronic state. The driving force for the conformational change is provided by two factors: (a) solvent polarity increase; (b) the formation of two separate hydrogen bonds in the anti species. In the syn structure, formation of cyclic hydrogen bonds leads to rapid depopulation of the lowest excited singlet state via two competing mechanisms: proton transfer and enhanced internal conversion. The experimental results are rationalized by calculations which include specific and nonspecific solvent effects.
Źródło:
Acta Physica Polonica A; 2007, 112, S; S-105-S-120
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-4 z 4

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