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Lower Rim Substituted p‐tert ‐Butyl‐Calix[4]arene. Part 15. Pb(II)‐Ion‐Selective Electrodes Based on p‐tert ‐Butyl‐calix[4]arene Thioamides
Author(s) -
Bocheńska Maria,
Guziński Marcin,
Kulesza Joanna
Publication year - 2009
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.200904638
Subject(s) - selectivity , chemistry , electrode , membrane , calixarene , ion , ion selective electrode , inorganic chemistry , medicinal chemistry , organic chemistry , molecule , biochemistry , catalysis
Tetrasubstituted p‐tert‐ butylcalix[4]arene‐thioamides ( 1 – 5 ) were applied as ionophores in ion‐selective membrane electrodes (ISE) and were tested towards Pb‐selectivity. The selectivity coefficients of the electrodes were determined. The tertiary calix[4]thioamides ( 1, 2 ) show remarkable selectivity for Pb(II) cations when compared with respectable calix[4]amides. The electrode membranes with those ligands are stable, the Pb‐characteristics are close to nernstian within a wide linear range (−log c =6–1). Compounds 3 – 5 , the secondary calix[4]thioamides form less stable electrode membranes. Complex formation constants of the ligands 1, 2, 3 and 5 with Pb(II) and some most interfering ions were determined.