Molecular Design, Characterization, and Application of Multiinformation Dyes (MIDs) for Optical Chemical Sensings. 3. Application of MIDs for λmax-Tunable Ion-Selective Optodes

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Abstract
By utilizing “multiinformation dyes (MIDs)”, which have plural spectral change characteristics such as an absorption maximum wavelength (λmax) shift based on a polarity change and an absorbance change due to protonation, novel λmax-tunable ion-selective optodes were proposed and prepared by employing MIDs with membrane solvents having different polarities. For controlling the detecting λmax of the optode, the novel polar membrane solvent [2-[[6-(2-nitrophenoxy)hexyl]oxy]methyl]isobutane-1,3-diol was designed and synthesized, which was used together with a typical membrane solvent nitrophenyl octyl ether. By mixing these two membrane solvents, the λmax position of the optode detection wavelength can be shifted and controlled and was successfully applied to a λmax-tunable Li+-selective optode based on a highly Li+-selective ionophore TTD14C4. The λmax tuning technique is useful for preparing an optode system using a low-cost light source such as a light-emitting diode or a popular laser.