Studies of monomer-dimer equilibrium of 2-nitrosopyridines in solution and in solid state (CROSBI ID 597415)
Prilog sa skupa u zborniku | sažetak izlaganja sa skupa | domaća recenzija
Podaci o odgovornosti
Varga, Katarina ; Biljan, Ivana ; Milovac, Srđan ; Tomišić, Vladislav ; Mihalić, Zlatko ; Vančik, Hrvoj
engleski
Studies of monomer-dimer equilibrium of 2-nitrosopyridines in solution and in solid state
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.
2-nitrosopyridine ; solid-state ; photochemistry
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Podaci o prilogu
155-155.
2013.
objavljeno
Podaci o matičnoj publikaciji
23. Hrvatski skup kemičara i kemijskih inženjera : knjiga sažetaka
Hadžiev, Andrea ; Blažeković, Zdenko
Zagreb: Hrvatsko društvo kemijskih inženjera i tehnologa (HDKI)
978-953-6894-50-5
Podaci o skupu
23. HRVATSKI SKUP KEMIČARA I KEMIJSKIH INŽENJERA
poster
21.04.2013-24.04.2013
Osijek, Hrvatska