Interactions between iodide ions and quinoid rings (CROSBI ID 650949)
Prilog sa skupa u zborniku | sažetak izlaganja sa skupa
Podaci o odgovornosti
Milašinović, Valentina ; Molčanov, Krešimir ; Stilinović, Vladimir ; Mali, Gregor ; Grdadolnik, Jože
hrvatski
Interactions between iodide ions and quinoid rings
A series of cocrystals of tetrachloro- and tetrabromoquinone with organic iodide salts has been prepared and structurally characterised. Derivatives N-methylpyridinium were chosen as cations, due to their planarity and similar size to the quinones, while their electronic properties are radically different. While the iodide usually acts as an electron donor, reducing the quinone into the semiquinone radical, sometimes the co-crystals of the neutral quinone and the iodide appear. In the studied crystals, the common motive, or supramolecular synthon, has been identified: a sandwich-like I-∙∙∙quinone∙∙∙I- moiety with close contacts between the iodide anion and carbon skeleton of the quinoid ring. Distances between the iodide and the ring centroid range between 3.6 and 3.85 Å, which is slightly shorter than sum of van der Waals radii for C and I. Interactions between π system aromatic ring and an anion are rarely observed, since aromatics are usually electron-rich ; in the case of electron-depleted quinoid rings, anion∙∙∙π contacts are more likely to form. In the studied cases, however, there is also a partial electron transfer between the iodide and the quinone which is noted by a change of colour: the neutral quinone is yellow, while the co-crystals and the semiquinone crystals are black.
iodide anion ; quinoid ring ; co-crystals
nije evidentirano
engleski
Interactions between iodide ions and quinoid rings
nije evidentirano
iodide anion ; quinoid ring ; co-crystals
nije evidentirano
Podaci o prilogu
163-163.
2017.
objavljeno
Podaci o matičnoj publikaciji
25. Hrvatski skup kemičara i kemijskih inženjera : knjiga sažetaka
Đaković, Marijana ; Miljanić, Snežana ; Šantić, Ana ; Vianello, Robert
978-953-55232-7-7
Podaci o skupu
25. hrvatski skup kemičara i kemijskih inženjera
poster
19.04.2017-22.04.2017
Poreč, Hrvatska