Linked Life Data

12560962

Source:http://linkedlifedata.com/resource/pubmed/id/12560962

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
2
pubmed:dateCreated
2003-1-31
pubmed:abstractText
1-Butyl-3-methylimidazolium hexafluorophosphate (BMIM-PF(6)) was synthesized and purified to be used as a ionic liquid solvent. Its physicochemical properties were studied. The ionic liquid/water (P(il/water)) and ionic liquid/heptane (P(il/heptane)) distribution coefficients of a set of 40 compounds with various functionalities, including organic acids, organic bases, amino acids, antioxidants, and neutral compounds, were measured using liquid chromatography. For ionizable compounds, the P(il/water) values measured at pH 2, 5.1, and 10 were very different. These allowed the determination of both the molecular P(o)il(/water) values and the ion P(-)il(/water) value for each compound. These coefficients were compared to the corresponding P(oct/water) coefficients. Marked differences in the partitioning behavior of basic, acidic, and neutral compounds were observed. The relationship between P(il/water) and P(oct/water) is different from that reported previously. By using the linear free energy solvation approach and the descriptors found for 12 solutes, the BMIM-PF(6) solvent parameters were calculated for the ionic liquid/water and ionic liquid/heptane biphasic systems. The regression parameters show a low basicity of the BMIM-PF(6) solvent compared to octanol. The high cohesion of the ions in the ionic liquid phase is also indicated by the regression equations obtained. Ionized phenols (phenoxide ions) associate more strongly with BMIM-PF(6) than most other ionized molecules. Amino acids were not soluble in ionic liquid; however, it is possible to extract them partially by adding a crown ether to the ionic liquid phase and working at pH 1. The positive form of amino acids is complexed by the crown ether and the complex is extracted in the ionic liquid phase.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jan
pubmed:issn
1618-2642
pubmed:author
pubmed:issnType
Print
pubmed:volume
375
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
191-9
pubmed:dateRevised
2007-11-14
pubmed:meshHeading
pubmed:year
2003
pubmed:articleTitle
Solvent properties of the 1-butyl-3-methylimidazolium hexafluorophosphate ionic liquid.
pubmed:affiliation
Department of Chemistry, Iowa State University, Ames 50011, USA.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S., Research Support, Non-U.S. Gov't