Abstract
The ability of meso-tetra(pentafluorophenyl)porpholactone (TFPL) and its Pt(ii) complex [meso-tetra(pentafluorophenyl)porpholactonato]Pt(ii) (TFPLPt) to function as optical high pH sensors is described. Under strongly alkaline or high methoxide conditions, their UV-vis spectra undergo dramatic and reversible red-shifts. The dynamic range for the sensor T FPLPt in solution is from pH 11.5 to 13.2. Using 1H, 19F, and 13C NMR, UV-vis and IR spectroscopy, mass spectrometry, and the use of model compounds, the molecular origin of this optical shift is deduced to be a nucleophilic attack of OH-/MeO - on the lactone carbonyl of the chromophore, representing a novel mechanism for porphyrin-based sensors. The sensing compound was solubilized with Cremophor EL® for use in aqueous solutions and embedded in polymer matrixes for testing as optical fiber-based optodes and planar sheet optode materials.
Original language | English (US) |
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Pages (from-to) | 2125-2131 |
Number of pages | 7 |
Journal | Analyst |
Volume | 135 |
Issue number | 8 |
DOIs | |
State | Published - Aug 2010 |
ASJC Scopus subject areas
- Analytical Chemistry
- Biochemistry
- Environmental Chemistry
- Spectroscopy
- Electrochemistry