2,2 -Bipyridyl calix arene conjugates

The p-bu -calix[4]arene-linked mono and di-trisbipyridylruthenium° complexes 151, 152 formed by the reactions of cis-Ru (bipy)2Q2 and lower rim conjugates of p-bu -calix[4]arene and 2,2 -bipyridyl unit(s) linked at 5 -position(s) through methylene linker(s), have free OH groups acting as add-base sites. By operation of an intramolecular photoinduced electron transfer process, these complexes showed luminescent pH sensor action (94JC S(CC)185). 

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