Naslov
Foto-termičke reakcije derivata nitrozobenzena u čvrstom stanju
(Photothermal Reactions Derivatives Nitrosobenzene In Solid State)

Autori
Milovac, Srđan ; Mišković, Anamarija ; Medančić, Tina ; Vančik, Hrvoj

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

Izvornik
XXI. Hrvatski skup kemičara i kemijskih inženjera – Knjiga sažetaka / Novak, Predrag - Zagreb : Hrvatsko društvo kemijskih inženjera i tehnologa (HDKI), 2009, 91-91

ISBN
978-953-6894-38-3

Skup
XXI. Hrvatski skup kemičara i kemijskih inženjera

Mjesto i datum
Trogir, Hrvatska, 19.04.2009. - 22.04.2009

Vrsta sudjelovanja
Poster

Vrsta recenzije
Nije recenziran

Ključne riječi
čvrsto stanje; monomer-dimer ravnoteža; foto-termičke reakcije
(solid state; monomer-dimer equilibrium; photothermal reactions)

Sažetak
It is well known that nitrosobenzenes can exist in three distinct molecular forms: monomers which are blue or green, and (Z) or (E)-dimers which are yellow or colorless. [1] At ambient temperature in solid state most of the organic nitroso compounds exist as dimers, while in solution monomer-dimer equilibrium is established. [2] It known that at low temperature nitroso dimers can be converted to nitroso monomers photolytically and reverted back to dimers by a simple thermal process. [3] Such a photothermal systems in which we are able break the chemical bond between two nitrogen atoms and bind them together again can be used as a chemical “ off-on” switch in the possible development of intelligent materials. In this work we were investigated monomer-dimer equilibrium of the nitrosobenzene (1), m-chloronitrosobenzene (2) and p-chloronitrosobenzene (3) in the solid state under cryogenic photochemical conditions. It was found that compound 1 and 3 can be converted to monomers after irradiation with UV light at 12 K, while compound 2 cannot be converted to monomers. Temperature conversion monomers to dimers was also determined and it is amount to 270 K for compound 1 while for compound 3 it is 295 K. Monomer-dimer equilibriums were monitored by FTIR spectroscopy. Kinetic of dimerisations for compound 3 was determined by measuring the IR spectral changes at different temperatures and the typical sigmoid kinetic curve was obtained. We have shown that a photothermal process on compound 3 could be repeated several times without destroying state of systems. Above mentioned compound at ambient temperature cannot be photolytically converted to monomers.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

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