Wyniki wyszukiwania - BazTech

1

Poszukiwanie różnic we właściwościach kompleksotwórczych alkiloimidazoli i ich wykorzystanie

Lenarcik B., Radzymińska-Lenarcik E.

Chemik

|

2011

|

Vol. 65, nr 4

237-242

PL

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.

EN

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.

2

Possibility of Some Metals Dissolution in Mixtures of Dimethyl Sulfoxide and Aliphatic Halogen Derivative. Part III. Characteristics of the Metallic Palladium Dissolution Reaction in Binary Organic Mixtures

Jurek K., Lenarcik B.

Polish Journal of Chemistry

|

2006

|

Vol. 80, nr 5

729-736

EN

The study of dissolution process showed that the palladium could be dissolved at 323Kin organic system which consisted of DMSO and one of the following solvents: 1,2-dibromoethane, tribromomethane, 1,1,2,2-tetrabromoethane or tetrabromomethane. As a result of the dissolution reaction in binary organic system, the square planar palladium( II) complexes were obtained. Products of the dissolution of metallic palladium were characterized using UV-Vis and IR spectroscopy, MS spectrometry, cyclic voltammetry and analytical methods.

3

Possibility of Some Metals Dissolution in Mixtures of Dimethyl Sulfoxide and Aliphatic Halogen Derivative. Part II. Characteristics of the Metallic Nickel Dissolution Reaction in Binary Organic Mixtures

Lenarcik B., Jurek K.

Polish Journal of Chemistry

|

2005

|

Vol. 79 / nr 10

1605-1613

EN

Nickel can be dissolved at temperature 323 K in binary organic mixtures containing dimethyl sulfoxide and one of halogeno aliphatic derivatives: 1,2-dibromoethane or tribromomethane, 1,1,2,2-tetrabromoethane, tetrabromomethane and hexachloroethane. As a result of dissolution of metallic nickel in binary organic system the octahedral nickel(II) complexes were obtained. Products of the dissolution of metallic nickel were characterized by UV-Vis and IR spectroscopy,MS spectrometry, thermal decomposition and analytical methods.

4

The Influence of Steric Effect and Alkyl Chain Length on Extraction of the Complexes of Co(II), Ni(II), Cu(II), Zn(II) and Cd(II) with 1-Alkyl-2-methylimidazoles

Lenarcik B., Adach A., Radzymińska-Lenarcik E.

Polish Journal of Chemistry

|

1999

|

Vol. 73, nr 8

1273-1281

EN

Extraction of complexes of 1,2-dimethylimidazole, 1-ethyl-2-methylimidazole, 1-propyl-2-methylimidazole and 1-butyl-2-methylimidazole with Co(II), Ni(ii0, Cu(II), Zn(II) and Cd(II) from aqueous solutions (I=0.5 at 298 K) with benzyl alcohol was investigated. For each system, the composition of the extracted species, their partition constans and the pH1/2 were determined.