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Search for differences in the complex forming abilities of alkylimidazoles and making use of them
Języki publikacji
Abstrakty
Wykazano, że zasadowość cząsteczek należących do poszczególnych szeregów homologicznych alkiloimidazoli zależy od po- łożenia podstawników alkilowych w pierścieniu i rośnie liniowo ze wzrostem ich długości. Zasadowość zmniejsza się w szeregu: 1,2,4-trialkiloimidazole > 1,2-dialkiloimidazole > 1,4- dialkiloimidazole > 2- alkiloimidazole > 1-alkiloimidazole. Zasadowość ligandów ma wielkie znaczenie w rozdzielaniu metali. Metodą podziału w układzie ciecz-ciecz wyznaczono stałe trwałości tworzących się w roztworach wodnych kompleksów 1-alkilo- oraz 1-alkilo-2-metyloimidazoli z Co(II), Ni(II), Cu(II) i Zn(II). Wykazano, że tworzenie się kompleksów z metalami przejściowymi zależy od dwóch efektów - sterycznego lub hydrofobowego danego liganda (alkiloimidazolu). Efekty te można wykorzystać do selektywnego rozdzielania Co(II) od Ni(II), Cu(II) od Co(II) i Ni(II), Zn(II), Cd(II), czy innych kationów, w zależności od wyjściowego składu mieszaniny wykonanej różnymi technikami separacyjnymi.
It was shown that the alkalinity of the molecules belonging to different homologous series alkylimidazoles depends on the position of alkyl substituents in the ring and increases linearly with increasing length. Alkalinity decreases in the series: 1,2,4-trialkylimidazole> 1,2-dialkylimidazole > 1,4 – dialkylimidazole > 2 - alkylimidazole> 1-alkylimidazole. The alkalinity of the ligands is of great importance in the distribution of metals. The liquid-liquid partition method was used to determined the stability constants of Co(II), Ni(II), Cu(II), and Zn(II) complexes with 1-alkyl- and 1-alkyl-2-methylimidazoles in aqueous solutions. It was shown that the formation of complexes with transition metals depends on two effects – steric or hydrophobic of ligands (alkylimidazole). These effects can be used for the selective separation of Co(II) from Ni(II), Cu(II) from Co(II) and Ni(II), Zn(II), Cd(II) or other cations, depending on the initial mixture composition.
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Rocznik
Tom
Strony
237--242
Opis fizyczny
Bibliogr. 22 poz.
Twórcy
Bibliografia
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- 9. Radzyminska-Lenarcik E.: Effect of Alkyl Chain Length on the Extraction of Copper(II) Complexes with 1-Alkyl-2-methylimidazoles. Sep. Sci. Technol. 2007, 42, 2661-2676.
- 10. Radzyminska-Lenarcik, E.: Influence of the steric hindrance, ligand hydrophobicity and DN of solvents on structure and extraction of Cu(II) complexes of 1-alkyl-2-ethylimidazoles. Sep. Sci. Technol. 2008, 43, 794-814.
- 11. Radzyminska-Lenarcik E.: Search for the possibility of utilizing the differences in complex-forming capacities of alkylimidazoles for selective extraction of some metal ions from aqueous solutions. Polish J. Chem. Technol. 2008, 10, 73-78.
- 12. Radzyminska-Lenarcik E.: The Influence of Alkyl Chain Length in 1,2-Dial-kylimidazoles on the Extraction Capacity and Structure of Their Copper(II) Complexes. Sep. Sci. Technol. 2009, 44, 954-970.
- 13. Radzyminska-Lenarcik E.: The Influence of Steric Effect, Alkyl Chain Length and DN of Solvents on the Extraction of Cu(II) Complexes with 1-Alkyl-4-me-thylimidazoles. Solvent Extraction and Ion Exchange 2010, 28, 636-652.
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- 15. Lenarcik B., Kierzkowska A.: The Influence of Alkyl Length on Stability Constants of Zn(II) Complexes with I-Alkylimidazoles in Aqueous Solutions and Their Partition Between Aqueous Phase and Organic Solvent. Solvent Extraction and Ion Exchange 2004, 22, 449-471.
- 16. Lenarcik B., Kierzkowska A.: The Influence of Alkyl Chain Length and Steric Effect on Extraction of Zinc(II) Complexes with I-Alkyl-2-methylimidazoles. Solvent Extraction and Ion Exchange 2006, 24, 433-445.
- 17. Lenarcik B., Kierzkowska A: The Influence of Alkyl Chain Length and Steric Effect on Stability Constants and Extractability of Zn(II) Complexes with l-Alkyl-4(5)-methylimidazoles. Sep. Sci. Technol. 2004, 39, 3485-3508.
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- 19. Radzyminska-Lenarcik E., Lenarcik B.: Determination of stability constants of same I-alkylimidazole complexes with Cd(II) by extraction method. XXIV-th International Symposium on Physicochemical Methods of Separations "ARS SEPARATORIA 2009" June 14-18. 2009 Kudowa-Zdrój, Poland p. 187-188.
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