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3 Polish Journal of Chemistry

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ph Dependent Enantioselection of Amino Acids by Phosphorous-Containing Calix[4]resorcinarene in Langmuir Monolayers

Pietraszkiewicz M., Prus P., Bilewicz R.

Polish Journal of Chemistry

1999

Vol. 73, nr 12

2035-2042

Lipophilic calix[4]resorcinarene with phosphorous acid amide groups linking oxygen atoms is a rigid system of the cavitand type, in which conformational flexibility is strongly limited. These chiral receptors form stable Langmuir monolayers on water surface with surface area per molecule in the compressed layer being almost ph-independent.

pH Dependent Enantiomeric Recognition of Amino Acids by Mannich-Type Calix[4]resorcinarenes in Langmuir Monolayers

Pietraszkiewicz M., Prus P., Bilewicz R.

Polish Journal of Chemistry

1999

Vol. 73, nr 11

1845-1853

The surface potential of these compounds is distinctly higher in the presence of substituents and its further increase upon decreasing the pH of the subphase is observed only for the derivatized calixarenes. This means that protonation on the amine centers is the factor determining the properties of the monolayer.

Chiral recognition studies of amino acids by chiral calix[4]resorcinarenes in Langmuir films

Pietraszkiewicz M., Prus P., Fabianowski W.

Polish Journal of Chemistry

1998

Vol. 72, nr 6

1068-1075

Two chiral, lipophilic calix[4]resorcinarenes of Mannich-base type, containing (S((-)-phenylethylamine (CAL11-PhEt), and (1R,2S)(-)-norephedrine (CAL11-EPh) form Langmuir monolayers on water surface. Chiral discrimination of amino acids: alanine, valine, leucine and tryptophan was observed by the changes in the surface area, which was different for D- and L-forms.