2,2′-Bithiazolyl- p- tert-butylcalixarene podands. Synthesis and fluorescence properties
Five new conic calixarene-based podands incorporating the fluorescent 2,2′-bithiazole subunit have been synthesised and fully characterised. Comparative fluorescence studies shown a decrease of bithiazole Iemfrom the mono- to the tetra-substituted species. Two intramolecular deactivation processes and a “calixarene effect” have been proposed.