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Pregled bibliografske jedinice broj: 76164

Dimerisation and oxygen loss upon crystallisation of nitroso compounds


Višnjevac, Aleksandar; Milovac, Srđan; Šimunić- Mežnarić, Vesna; Kojić-Prodić, Biserka; Vančik, Hrvoj
Dimerisation and oxygen loss upon crystallisation of nitroso compounds // 11th Slovenian-Croatian crystallographic meeting - book of abstracts / Leban, Ivan ; Popović, Stanko (ur.).
Ljubljana: Univerza v Ljubljani, 2002. str. 28-28 (predavanje, nije recenziran, sažetak, znanstveni)


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Naslov
Dimerisation and oxygen loss upon crystallisation of nitroso compounds

Autori
Višnjevac, Aleksandar ; Milovac, Srđan ; Šimunić- Mežnarić, Vesna ; Kojić-Prodić, Biserka ; Vančik, Hrvoj

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

Izvornik
11th Slovenian-Croatian crystallographic meeting - book of abstracts / Leban, Ivan ; Popović, Stanko - Ljubljana : Univerza v Ljubljani, 2002, 28-28

Skup
11th Slovenian-Croatian crystallographic meeting

Mjesto i datum
Bohinj, Slovenija, 27.06.2002. - 30.06.2002

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Nije recenziran

Ključne riječi
dimerisation ; oxygen loss ; crystallisation ; nitroso compounds

Sažetak
Most of the organic nitroso compounds exist as colourless dimers in solid state, and/or as green or blue monomers in solution.1 Crystallisation process implies simultaneous dimerisation. Nevertheless, these compounds reveal reversible dissociation/association under photochemical conditions in solid state, and as such they represent a simple and effective photochromic system.2 Dimers of p-bromonitrosobenzene (1), p- iodonitrosobenzene (2), p-nitronitrosobenzene (3) and p-methylnitrosobenzene (4) were studied by X- ray crystallography. Unprecedented lack of oxygen atoms in what was expected to be an azodioxy moiety was encountered in all of the presented structures. Furthermore, the structures 3 and 4 (Figs. 1 and 2) reveal disorder of the azo group over two positions, with s.o. 0.70 and 0.30. Two independent positions of nitrogen atoms appeared clearly in a Fourier difference map, whereas it was impossible to resolve discrete positions of disordered C-atoms of the benzene rings which, as a consequence, reveal slightly increased values of displacement parameters. For structure 3, the non- centrosymmetric space group P21 is reported due to a large number of reflections disobeying extinction rules for P21/c (in which, however, refinement converges as well). Molecules of 1 and 2 reveal crystallographic inversion centre at the midpoint of the N-N bond, having half a molecule in an asymmetric unit of the space groups P21/c and Pbcn, respectively. The molecule of 4 is of C1 symmetry, occupying general position.

Izvorni jezik
Engleski

Znanstvena područja
Kemija



POVEZANOST RADA


Projekti:
0098036

Ustanove:
Institut "Ruđer Bošković", Zagreb,
Prirodoslovno-matematički fakultet, Zagreb


Citiraj ovu publikaciju:

Višnjevac, Aleksandar; Milovac, Srđan; Šimunić- Mežnarić, Vesna; Kojić-Prodić, Biserka; Vančik, Hrvoj
Dimerisation and oxygen loss upon crystallisation of nitroso compounds // 11th Slovenian-Croatian crystallographic meeting - book of abstracts / Leban, Ivan ; Popović, Stanko (ur.).
Ljubljana: Univerza v Ljubljani, 2002. str. 28-28 (predavanje, nije recenziran, sažetak, znanstveni)
Višnjevac, A., Milovac, S., Šimunić- Mežnarić, V., Kojić-Prodić, B. & Vančik, H. (2002) Dimerisation and oxygen loss upon crystallisation of nitroso compounds. U: Leban, I. & Popović, S. (ur.)11th Slovenian-Croatian crystallographic meeting - book of abstracts.
@article{article, author = {Vi\v{s}njevac, Aleksandar and Milovac, Sr\djan and \v{S}imuni\'{c}- Me\v{z}nari\'{c}, Vesna and Koji\'{c}-Prodi\'{c}, Biserka and Van\v{c}ik, Hrvoj}, year = {2002}, pages = {28-28}, keywords = {dimerisation, oxygen loss, crystallisation, nitroso compounds}, title = {Dimerisation and oxygen loss upon crystallisation of nitroso compounds}, keyword = {dimerisation, oxygen loss, crystallisation, nitroso compounds}, publisher = {Univerza v Ljubljani}, publisherplace = {Bohinj, Slovenija} }
@article{article, author = {Vi\v{s}njevac, Aleksandar and Milovac, Sr\djan and \v{S}imuni\'{c}- Me\v{z}nari\'{c}, Vesna and Koji\'{c}-Prodi\'{c}, Biserka and Van\v{c}ik, Hrvoj}, year = {2002}, pages = {28-28}, keywords = {dimerisation, oxygen loss, crystallisation, nitroso compounds}, title = {Dimerisation and oxygen loss upon crystallisation of nitroso compounds}, keyword = {dimerisation, oxygen loss, crystallisation, nitroso compounds}, publisher = {Univerza v Ljubljani}, publisherplace = {Bohinj, Slovenija} }




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