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Optical Sensing of Cesium Using 1,3‐Alternate Calix[4]‐mono‐ and Di(anthrylmethyl)aza‐crown‐6
Author(s) -
Ji HaiFeng,
Hettich Robert L.,
Brown Gilbert M.,
Dabestani Reza
Publication year - 1999
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1999.tb08297.x
Subject(s) - caesium , crown (dentistry) , chemistry , materials science , inorganic chemistry , composite material
We have synthesized two derivatives of alkylanthracene covalently bonded to 1,3‐alternate calix[4]aza‐crown‐6 at the nitrogen position to study the effect of alkali metal ion complexation on the emission properties of anthracene fluorophore. The mono‐ and dianthryl‐substituted probes are weakly fluorescent because their emission is partially quenched by photoinduced electron transfer (PET) from the nitrogen lone pair to the excited singlet state of anthracene. Upon complexation of alkali metal ions ( e.g. K + , Cs + ) by the crown moiety, the nitrogen lone pair can no longer participate in the PET process causing an enhancement in the emission of anthracene fluorophore (fluorescent turn on). The maximum fluorescence enhancement observed upon complexation of cesium ions by mono‐ and dianthryl‐substituted calix[4]aza‐crown‐6 relative to the uncomplexed form was 8.5‐ and 11.6‐fold, respectively.