174. A Ratiometric Luminescent Switch Based on Platinum Complexes Tethered to a Crown-Ether Scaffold
     Stephan Sinn, Frank Biedermann, Mahesh Vishe, Alessandro Aliprandi, Celine Besnard, Jérôme Lacour, Luisa De Cola
     ChemPhysChem 2016, 17, 1829-1834

A ratiometric sensor for potassium is reported, based on phosphorescent dinuclear cyclometalated Pt(II) complexes featuring a cis-crown ether as the cation-recognition unit. The metal complexes are blue luminescent in solution but become strongly orange emissive when aggregation occurs, as it is the case when the macrocyclic is in the folded state. Upon binding of the cation, dye-disaggregation occurs, resulting in a pronounced change in the emission properties (e.g., emission wavelength), used for ratiometric sensing applications. Reversibility of the binding was confirmed by competitive titration experiments with unsubstituted 18-crown-6; the system shows supramolecular switching behavior.

DOI : 10.1002/cphc.201501171 

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