Luminescent pH sensors based on p-tert-butylcalix[4]arene-linked ruthenium(II) trisbipyridyl complexes

p-tert-Butylcalix[4]arene-linked trisbipyridylruthenium(II) complexes 4a and 4b show luminescent pH sensor action, in 50%(v/v) aqueous methanol, by operation of an intramolecular photoinduced electron transfer (PET) process.

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