New water-soluble calixarenes modified with amino acids at the upper rim

Autor:	Yusuke Tajiri, Seiji Shinkai, Takeshi Nagasaki
Rok vydání:	1993
Předmět:	Surface tension chemistry.chemical_classification Water soluble Chemistry Calixarene Organic chemistry General Chemistry Inclusion (mineral) Selectivity Fluorescence Micelle Amino acid
Zdroj:	Recueil des Travaux Chimiques des Pays-Bas. 112:407-411
ISSN:	0165-0513
DOI:	10.1002/recl.19931120617
Popis:	Calix[n]arenes (n = 4 and 6) modified with L-cysteines were synthesized. These calix[n]arenes were water-soluble, particularly, at acidic and basic pH regions. The critical micelle concentrations (estimated by surface tension) appeared at (0.50-3.2) · 10−5 M. The “hydrophobicity” of these cavities was estimated by fluorescence of 8-anilino-1-naphthalene-sulfonate (ANS): it showed that these calix[n]arenes become most hydrophobic at pH 5-6. The selectivity in guest inclusion was significantly affected by the medium pH.
Databáze:	OpenAIRE
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