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Kinetics of Photochemical Processes in Photochromic Azobenzene Derivatives: Effect of Matrix and of The Phase Stability
Krzysztof Janus, Katarzyna Matczyszyn and Juliusz Sworakowski
Institute of Physical and Theoretical Chemistry, Wroclaw University of Technology, Poland
Abstract
The contribution discusses the effect of environmental constraints on the kinetics of photochromic processes occurring in two groups of azobenzene derivatives : azobenzene-containing crown ethers dissolved in various polymer matrices, and para-disubstituted azobenzenes dissolved in liquid-crystalline matrices.
In the azobenzene-containing crown ethers, the presence of the crown is expected to affect the isomerisation kinetics. The experiments demonstrated that the crown create constraints which modify the molecular structure, thus influencing the isomerisation kinetics as was indeed found in our experiments. In the shortest crown, the room-temperature rate constant of the thermal isomerisation is ca. two orders of magnitude lower than the respective rate in the parent azobenzene.
Measurements of the kinetics of isomerisation of photochromic 4-fluoro-4'-methoxyazobenzene dissolved in the liquid-crystalline pentylocyanobiphenyl (5CB) were carried out. Deviations from the expected Arrhenius behaviour were observed for the thermal cis-trans reaction near the phase transition temperature of 5CB (308°K). It was also found that the isomerisation reaction may trigger the nematic-to-isotropic phase transition at temperatures substantially lower than the thermodynamic transition temperature.
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Download article (PDF)Electronic and Magnetic Dynamic Properties of Imidazolate Complexes
F. Ragot1, S. Belin2, V.G. Ivanov3, D.L. Perry4, M. Ortega4, T.V. Ignatova5, I.G. Kolobov5, E.S. Masalitin5, G.V. Kamarchuk5, A.V. Yeremenko5, P. Molinie1, J. Wery1
and E. Faulques1
1 Institut des Materiaux Jean Rouxel, Nantes, France
2LURE, Orsay, France
3Faculty of Physics, University of Sofia, Bulgaria
4Lawrence Berkeley National Laboratory, Berkeley, USA
5B. Verkin Institute for Low Temperature Physics and Engineering, Kharkov, Ukraine
The Use of Vibronic Phenomena in Adsorption Phase for Developing of Semiconductor Gas Sensors
Vladimir Zaitsev1, Barbara Kebbecus2
1 M. V. Lomonosov Moscow State University, Physics Dpt., Russia
2 New Jersey Institute of Technology, USA
The Study of Polystyrene Surface Local Mechanical Properties by the Atomic Force Microscopy
Anna V. Zaitseva1, Victor M. Rudoi2, Olga V. Dement'eva2, Maria E. Kartseva2
1 M. V. Lomonosov Moscow State University, Physics Dpt., Russia
2 Institute of Physical Chemistry RAS, Moscow, Russia
Dependence of Polymerization Ability of Maleimidophenylmethacrylates from Π-electron Structure of Maleimide fragments
L.Yu. Gryshchuk, L.O. Vretik, V.G. Syromyatnikov
Kyiv Taras Shevchenko University, Ukraine
Optical Properties of Ferroelectric Langmuir-Blodgett Films Impregnated with Dye Molecules
V. B. Zaitsev, A. N. Nevzorov, G. S. Plotnikov
M. V. Lomonosov Moscow State University, Physics Department, Moscow, Russia
High-conductivity Organic Metals as Electrode Materials
A.P. Pospelov1, M.V. Ved1, Nikolay D. Sakhnenko1,
Y.L. Alexandrov1, V.V. Shtefan1, A.V. Kravchenko2, G.V. Kamarchuk3
1National Technical University Kharkov Polytechnical Institute, Kharkov, Ukraine
2V. Karazine Kharkov National University, Kharkov, Ukraine
3B. Verkin Institute for Low Temperature Physics and Engineering, Kharkov, Ukraine
Calixarene-based QCM Sensors Array and Its Response to Volatile Organic Vapours
V.I. Kalchenko1, I.A. Koshets2 , E.P. Matsas2, O.N. Kopylov2,
A. Solovyov1, Z.I. Kazantseva2, Yu. M. Shirshov2
1Institute of Organic Chemistry, NAS of Ukraine, Kiev, Ukraine
2Institute of Semiconductor Physics, NAS of Ukraine, Kiev, Ukraine
