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A shift of up to 9 ppm in the 19F NMR resonance of 1 is observed on complexation of metal ions. This property makes these compounds attractive as sensors for metal ions. The mode of coordination (σ bonding to the fluorine atom or η2 coordination to the CF bond) in this type of system is also of interest.
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Plenio et al. (1994) studied this question.
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