Metal ions binding to tri-n-octylphosphine oxide (TOPO) monolayer spread at the air/water interface
作者： K. Hąc-Wydro , P. Wydro , P. Dynarowicz-Łątka
DOI: 10.1016/J.TSF.2007.11.055
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摘要: Abstract Our recent investigations proved excellent film-forming properties of tri-n-octylphosphine oxide (TOPO) spread at the free surface water (K. Hąc-Wydro, P. Wydro, Dynarowicz-Łątka, Pol. J. Chem., 79 (2005) 773). Since TOPO is known for its affinity to metal ions, it interest study behavior monolayers on aqueous subphases containing different ions. For our investigation we have selected mono- and divalent alkali differing in nuclear charge size. Additionally, influence La3+ VO2+ monolayer has been studied. In order characterize applied Langmuir technique recorded pressure–area (π–A) isotherms analyzed stability by monitoring decrease pressure (at constant area) vs time. Moreover, was examined comparing collapse values. Quantitatively, changes Gibbs energy passing from ion-containing subphase were determined datapoints. results indicate that shows highest towards among metals — magnesium lithium which posses smallest ionic radius investigated cations. results, based technique, are good agreement with extraction efficiency results.
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