ABSTRACT
Under reversed-phase high-performance liquid chromatographic conditions [Spherisorb ODS 1 stationary phase, UV detection at 254 nm, and acetonitrile-dichloromethane-acetic acid-methyl-tert-butylether (84.6/4.5/0.9/10, v/v/v/v) as the mobile phase], adding p-tert-butylcalix[8] (10(-5)-3.10(-5))-[12]arenes (10(-5)-4.10(-5) mol/L) to the mobile phase leads to decreased sorption of aromatic solutes on the surface of the sorbent because of the formation of host-guest inclusion complexes between the calixarenes and the aromatic molecules. Stability constants of the complexes (781-9338M(-1)) are determined from the relationship between the solute capacity factors and the calixarene concentration in the mobile phase.
ABSTRACT
Oxidised porous silicon samples prepared from highly and weakly doped p-type silicon substrates, have been functionalised with calix[4]arene (CA) molecules. They have been used for sodium detection as electrolyte/insulator/silicon (EIS) structures. An over Nernstian behaviour was observed and correlated with physical parameters of porous silicon samples (porosity, resistivity). A generalised Nernstian equation was proposed in order to describe this property. CA functionalised EIS structures based on porous silicon present higher lifetime compared to flat structures.
