Naslov
Mechanism of thermally induced solid-state E-Z isomerization of 3-halogenonitrosobenzenes

Autori
Varga, Katarina ; Vančik, Hrvoj

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
24. hrvatski skup kemičara i kemijskih inženjera : Knjiga sažetaka / Ukić, Šime ; Bolanča, Tomislav - Zagreb : Hrvatsko društvo kemijskih inženjera i tehnologa (HDKI), 2015, 131-131

ISBN
978-953-6894-54-3

Skup
24. rvatski skup kemičara i kemijskih inženjera

Mjesto i datum
Zagreb, Hrvatska, 21.04.2015. - 24.04.2015

Vrsta sudjelovanja
Poster

Vrsta recenzije
Domaća recenzija

Ključne riječi
activation energy ; 3-halogenonitrosobenzenes ; reaction rate constants ; thermal solid-state E-Z isomerization

Sažetak
The study of interactions of organic molecules, reaction mechanisms and phase transitions in the solid state are fundamental for understanding the structural changes that occur at the molecular level. Especially rare chemical transformations in solid state are thermal E-Z isomerizations, because most of the literature about the solid E-Z isomerizations has been focused on photoreactions. In comparison with the photochemical reactions, the thermally induced chemical reactions in crystals were from the mechanistic viewpoint less investigated. In our previous works we have developed the approach to the study of the solid- state reaction mechanisms by using the dimerizations and dissociations of the aromatic C- nitroso compounds as models. These nitroso molecules appear in solution prevalently as monomers that are in equilibrium with E- and Z- dimers(azodioxides). Since the azodioxide bond is relatively weak, the E-Z isomerization exclusively follows the pathway through the formation of the monomer intermediates. Direct “torsional” E-Z isomerization has not been observed as yet. In this work we demonstrate that the azodioxide Z-E isomerization in the solid state can occur without the formation of the free nitroso molecule. The reaction is studied by measuring the kinetics of isomerizations of 3-chloro- and 3- bromonirosobenzene at different temperatures and by analyzing corresponding activation parameters under different phase conditions.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

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