A two-component polymeric optode membrane based on a multifunctional ionic liquid
Kavanagh, Andrew, Byrne, Robert, Diamond, DermotORCID: 0000-0003-2944-4839 and Radu, Aleksandar
(2011)
A two-component polymeric optode membrane based on a multifunctional ionic liquid.
Analyst, 136
.
pp. 348-353.
ISSN 0003-2654
This work details the use of a 2-component optode membrane which is capable of
generating three distinct colours in the presence of Cu2+ and Co2+ ions. It has been
found that the ionic liquid (IL) trihexyltetradecylphosphonium dicyanamide
[P6,6,6,14][DCA] can act as plasticizer, ligand and transducer dye when used in
poly(vinylchloride) (PVC) membranes, which significantly simplifies the optode
membrane platform. Upon exposure to an aqueous Cu2+ solution, a yellow colour is
generated within the membrane, while exposure to aqueous Co2+ solution generates a
blue colour. Exposure to a solution containing both ions produces a green colour.
Vibrational spectroscopy has been used to investigate molecular basis of the IL-metal
binding mechanism. Analytical characteristics of the membranes including the effect
of interfering ions, binding constants and the limit of detection for both ions have
been estimated. Finally the case of simultaneous dual-analyte recognition is presented
based on two distinct absorption maxima.