Naslov
Studies of monomer-dimer equilibrium of 2-nitrosopyridines in solution and in solid state

Autori
Varga, Katarina ; Biljan, Ivana ; Milovac, Srđan ; Tomišić, Vladislav ; Mihalić, Zlatko ; Vančik, Hrvoj

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

Izvornik
23. Hrvatski skup kemičara i kemijskih inženjera : knjiga sažetaka / Hadžiev, Andrea ; Blažeković, Zdenko - Zagreb : Hrvatsko društvo kemijskih inženjera i tehnologa (HDKI), 2013, 155-155

ISBN
978-953-6894-50-5

Skup
23. Hrvatski skup kemičara i kemijskih inženjera

Mjesto i datum
Osijek, Hrvatska, 21.04.2013. - 24.04.2013

Vrsta sudjelovanja
Poster

Vrsta recenzije
Domaća recenzija

Ključne riječi
2-nitrosopyridine ; solid-state ; photochemistry

Sažetak
On contrary to nitrosobenzenes which appear in solution at room temperature exclusively as monomers, the preferred forms of 2-nitrosopyridines are Z-dimers. In addition, whereas nitrosobenzenes are mostly present as E-dimers in solid state, 2-nitrosopyridines are Z-stereomers. In the present work we studied monomer-dimer equilibrium of 2-nitrosopyridine (1) and its 4-methyl- (2) and 4-chloro- (3) derivatives (Scheme 1) both in solution and in solid state. Thermodynamic data for the dissociation of compounds 1-3 acquired by UV/VIS spectroscopy indicate that Z-dimers are thermodynamically favored over monomers at room temperature in solution. Furthermore, by using variable temperature 1H NMR spectroscopy we showed that compound 1 is able to form mixed dimers with p-nitronitrosobenzene. Solid-state photochemical studies of Z-configured 2-nitrosopyridine derivatives 1-3 by IR spectroscopy at cryogenic conditions indicate that all three compounds undergo photodissociation to corresponding monomers. The process is reverted by warming the samples to room temperature. Photolytic dissociation of compounds 1-3 enabled complete assignment of IR spectra of the resulting monomers for the first time. Experimental IR spectra of monomers of compounds 1-3 are in good agreement with the calculated spectra.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

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