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A Ratiometric Luminescent Switch Based on Platinum Complexes Tethered to a Crown‐Ether Scaffold
Author(s) -
Sinn Stephan,
Biedermann Frank,
Vishe Mahesh,
Aliprandi Alessandro,
Besnard Céline,
Lacour Jérôme,
De Cola Luisa
Publication year - 2016
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.201501171
Subject(s) - crown ether , phosphorescence , chemistry , supramolecular chemistry , luminescence , titration , photochemistry , cationic polymerization , platinum , metal , crystallography , inorganic chemistry , ion , crystal structure , polymer chemistry , fluorescence , organic chemistry , materials science , physics , optoelectronics , quantum mechanics , catalysis
A ratiometric chemosensor 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 a non‐aggregated state but become strongly orange emissive when in a close physical proximity, as is the case when the macrocycle is in the folded state. Upon binding of the cation, unfolding occurs, resulting in a pronounced change in the emission properties (e.g. emission wavelength), which can be used for ratiometric sensing applications. The reversibility of the binding was confirmed by competitive titration experiments with unsubstituted 18‐crown‐6; the system shows supramolecular switching behavior.