SCHEDULED MAINTENANCE
Alkali metal ions enhance the fluorescence quantum yield of the benzocrown ether derivatives (1c) and (1d) in methanol by factors of ⩽15 with no other visible changes in the electronic spectra and with predictable stability constants for the sensor-cation interaction, whereas protons exert a much smaller influence.
A. P. de Silva and K. R. A. S. Sandanayake, J. Chem. Soc., Chem. Commun., 1989, 1183 DOI: 10.1039/C39890001183
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