TY  - JOUR
AU  - Porobić, Slavica
AU  - Božić, Bojan Đ.
AU  - Dramićanin, Miroslav
AU  - Vitnik, Vesna
AU  - Vitnik, Željko J.
AU  - Marinović-Cincović, Milena
AU  - Mijin, Dušan Ž.
PY  - 2020
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8475
AB  - A series of nine 5-(4-substituted phenylazo)-3-amido-6-hydroxy-4-methyl-2-pyridones were synthesized and characterized by FT–IR, 1H and 13C NMR, UV–Vis, and PL spectroscopy. Photophysical properties of the dyes were examined in solvents of various polarities and at different pH values. The solvent effects on the absorbance and emission spectral shift were analyzed using Lippert–Mataga, Reichardt–Dimroth and Kamlet-Taft equations. Moreover, UV–Vis absorption and emission frequencies were correlated with Hammett substituent constants applying the linear free energy relationships. DFT calculations of the investigated dyes were accomplished to determine their structural and electronic properties. © 2019
T2  - Dyes and Pigments
T1  - Absorption and fluorescence spectral properties of azo dyes based on 3-amido-6-hydroxy-4-methyl-2-pyridone: Solvent and substituent effects
VL  - 175
SP  - 108139
DO  - 10.1016/j.dyepig.2019.108139
ER  - 

@article{
author = "Porobić, Slavica and Božić, Bojan Đ. and Dramićanin, Miroslav and Vitnik, Vesna and Vitnik, Željko J. and Marinović-Cincović, Milena and Mijin, Dušan Ž.",
year = "2020",
abstract = "A series of nine 5-(4-substituted phenylazo)-3-amido-6-hydroxy-4-methyl-2-pyridones were synthesized and characterized by FT–IR, 1H and 13C NMR, UV–Vis, and PL spectroscopy. Photophysical properties of the dyes were examined in solvents of various polarities and at different pH values. The solvent effects on the absorbance and emission spectral shift were analyzed using Lippert–Mataga, Reichardt–Dimroth and Kamlet-Taft equations. Moreover, UV–Vis absorption and emission frequencies were correlated with Hammett substituent constants applying the linear free energy relationships. DFT calculations of the investigated dyes were accomplished to determine their structural and electronic properties. © 2019",
journal = "Dyes and Pigments",
title = "Absorption and fluorescence spectral properties of azo dyes based on 3-amido-6-hydroxy-4-methyl-2-pyridone: Solvent and substituent effects",
volume = "175",
pages = "108139",
doi = "10.1016/j.dyepig.2019.108139"
}

Porobić, S., Božić, B. Đ., Dramićanin, M., Vitnik, V., Vitnik, Ž. J., Marinović-Cincović, M.,& Mijin, D. Ž.. (2020). Absorption and fluorescence spectral properties of azo dyes based on 3-amido-6-hydroxy-4-methyl-2-pyridone: Solvent and substituent effects. in Dyes and Pigments, 175, 108139.
https://doi.org/10.1016/j.dyepig.2019.108139

Porobić S, Božić BĐ, Dramićanin M, Vitnik V, Vitnik ŽJ, Marinović-Cincović M, Mijin DŽ. Absorption and fluorescence spectral properties of azo dyes based on 3-amido-6-hydroxy-4-methyl-2-pyridone: Solvent and substituent effects. in Dyes and Pigments. 2020;175:108139.
doi:10.1016/j.dyepig.2019.108139 .

Porobić, Slavica, Božić, Bojan Đ., Dramićanin, Miroslav, Vitnik, Vesna, Vitnik, Željko J., Marinović-Cincović, Milena, Mijin, Dušan Ž., "Absorption and fluorescence spectral properties of azo dyes based on 3-amido-6-hydroxy-4-methyl-2-pyridone: Solvent and substituent effects" in Dyes and Pigments, 175 (2020):108139,
https://doi.org/10.1016/j.dyepig.2019.108139 . .

TY  - JOUR
AU  - Pagnacco, Maja C.
AU  - Maksimović, Jelena P.
AU  - Potkonjak, Nebojša I.
AU  - Božić, Bojan D.
AU  - Horvath, Attila K.
PY  - 2018
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/1919
AB  - The Briggs-Rauscher reaction containing malonic acid may undergo a sudden transition from low (state I) to high iodide and iodine (state concentration states after a well-defined and strongly reproducible oscillatory period. This study clearly shows that even though the time-dependent behavior of the oscillatory state is reproducible, the time lag necessary for the appearance of the state I to state II transition after the system leaves the oscillatory state becomes irreproducible for an individual kinetic run. This crazy clock behavior of the state I to state II transition is identified by repeated experiments in which stirring rate is taken as a control parameter and all other parameters such as initial conditions, temperature, vessel surface, and the age of solution were kept constant. Surprisingly, a better stirring condition does not make the transition reproducible; it simply does not allow the transition to happen at all. The proposed mechanism, additional explanations, and proposals for this irreproducibility of state II been presented. Considering the fact that the number of crazy clock reactions is only a few, this study may contribute to a better understanding of fundaments of this phenomenon.
T2  - Journal of Physical Chemistry. Part A: Molecules, Spectroscopy, Kinetics, Environment and General Theory
T1  - Transition from Low to High Iodide and Iodine Concentration States in the Briggs-Rauscher Reaction: Evidence on Crazy Clock Behavior
VL  - 122
IS  - 2
SP  - 482
EP  - 491
DO  - 10.1021/acs.jpca.7b11774
ER  - 

@article{
author = "Pagnacco, Maja C. and Maksimović, Jelena P. and Potkonjak, Nebojša I. and Božić, Bojan D. and Horvath, Attila K.",
year = "2018",
abstract = "The Briggs-Rauscher reaction containing malonic acid may undergo a sudden transition from low (state I) to high iodide and iodine (state concentration states after a well-defined and strongly reproducible oscillatory period. This study clearly shows that even though the time-dependent behavior of the oscillatory state is reproducible, the time lag necessary for the appearance of the state I to state II transition after the system leaves the oscillatory state becomes irreproducible for an individual kinetic run. This crazy clock behavior of the state I to state II transition is identified by repeated experiments in which stirring rate is taken as a control parameter and all other parameters such as initial conditions, temperature, vessel surface, and the age of solution were kept constant. Surprisingly, a better stirring condition does not make the transition reproducible; it simply does not allow the transition to happen at all. The proposed mechanism, additional explanations, and proposals for this irreproducibility of state II been presented. Considering the fact that the number of crazy clock reactions is only a few, this study may contribute to a better understanding of fundaments of this phenomenon.",
journal = "Journal of Physical Chemistry. Part A: Molecules, Spectroscopy, Kinetics, Environment and General Theory",
title = "Transition from Low to High Iodide and Iodine Concentration States in the Briggs-Rauscher Reaction: Evidence on Crazy Clock Behavior",
volume = "122",
number = "2",
pages = "482-491",
doi = "10.1021/acs.jpca.7b11774"
}

Pagnacco, M. C., Maksimović, J. P., Potkonjak, N. I., Božić, B. D.,& Horvath, A. K.. (2018). Transition from Low to High Iodide and Iodine Concentration States in the Briggs-Rauscher Reaction: Evidence on Crazy Clock Behavior. in Journal of Physical Chemistry. Part A: Molecules, Spectroscopy, Kinetics, Environment and General Theory, 122(2), 482-491.
https://doi.org/10.1021/acs.jpca.7b11774

Pagnacco MC, Maksimović JP, Potkonjak NI, Božić BD, Horvath AK. Transition from Low to High Iodide and Iodine Concentration States in the Briggs-Rauscher Reaction: Evidence on Crazy Clock Behavior. in Journal of Physical Chemistry. Part A: Molecules, Spectroscopy, Kinetics, Environment and General Theory. 2018;122(2):482-491.
doi:10.1021/acs.jpca.7b11774 .

Pagnacco, Maja C., Maksimović, Jelena P., Potkonjak, Nebojša I., Božić, Bojan D., Horvath, Attila K., "Transition from Low to High Iodide and Iodine Concentration States in the Briggs-Rauscher Reaction: Evidence on Crazy Clock Behavior" in Journal of Physical Chemistry. Part A: Molecules, Spectroscopy, Kinetics, Environment and General Theory, 122, no. 2 (2018):482-491,
https://doi.org/10.1021/acs.jpca.7b11774 . .