Naslov
Iron(III) Complexation and Extraction by Aromatic Hydrazones

Autori
Benković, Tomislav ; Gojmerac Ivšić, Astrid ; Kontrec, Darko ; Galić, Nives

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

Izvornik
25. Hrvatski skup kemičara i kemijskih inženjera s međunarodnim sudjelovanjem ; 3. simpozij Vladimir Prelog : knjiga sažetaka = 25th Croatian Meeting of Chemist and Chemical Engineers with international participation. 3rd symposium “Vladimir Prelog” : Book of Abstracts / Šantić, Ana ; Đaković, Marijana - Zagreb : Hrvatsko društvo kemijskih inženjera i tehnologa (HDKI) ; Hrvatsko kemijsko drustvo, 2017, 245-245

ISBN
978-953-552327-7

Skup
25. Hrvatski skup kemičara i kemijskih inženjera s međunarodnim sudjelovanjem ; 3. simpozij Vladimir Prelog = 25th Croatian Meeting of Chemist and Chemical Engineers with international participation. 3rd symposium “Vladimir Prelog”

Mjesto i datum
Poreč, Hrvatska, 19.04.2017. - 22.04.2017

Vrsta sudjelovanja
Poster

Vrsta recenzije
Nije recenziran

Ključne riječi
aroylhydrazones ; iron(III) ; complexation ; extraction

Sažetak
Aromatic hydrazones, such as salicylaldehyde isonicotinoyl hydrazone, 2’-hydroxyacetophenone isonicotinoyl hydrazone and 2’- hydroxypropiophenone isonicotinoyl hydrazone, have been shown as promising iron-chelating agents [1]. Three methoxy derivatives (L1–L3) of salicylaldehyde nicotinoyl hydrazone (Figure 1) were prepared in this work and their complexation and extraction properties toward iron(III) were studied by UV-Vis spectrophotometry. Complexation of iron(III) was studied in acidic methanol/water 1/1 mixtures (0.01 mol dm–3 HNO3). All hydrazones hydrolyze at these experimental conditions but the iron complexes are stable. The stoichiometries of the formed complexes determined by batch spectrophotometric titrations were 1 : 1 (Fe3+ : L). The extraction of iron(III) from acidic aqueous solutions was performed with chloroform solutions of L1–L3. Optimal experimental conditions for extraction were determined, pH of aqueous phase was 3, concentration of ligand was 4×10–4 mol dm–3 and concentration of iron(III) was 4×10–5 mol dm–3. Stoichiometries of extracted complexes were determined to be 1 : 2 (Fe3+ : L) based on the results obtained by Job’s method and equilibrium shift method. Number of protons released during complexation was three. Molar absorption coefficient of iron(III) complex of L1 at 374 nm was 14091 mol–1 dm3 cm–1. The compound L1 was the most suitable of investigated compounds for extraction of iron(III) from aqueous to chloroform phase due to the least overlapping of absorption maxima of complex and ligand.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

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