Publication Details (including relevant citation information):
Ritwik Samanta, Sanjeev P. Mahanta, Sauradip Chaudhuri, Pradeepta K. Panda, Akkaladevi Narahari
Inorganica Chimica Acta 372 (2011) 281-285
Calixpyrrole bearing catechol-derived diether strap linked via alkyl chains has been synthesized and characterized for the first time. The strap with 1,2-diether link is providing a relatively constrained geometry on its side of the calixpyrrole moiety. As a result only one isomer (cis-type) of the receptor formed during reaction. The crystal structure reveals two molecules of methanol bound to the host. This calixpyrrole also exhibits enhanced binding towards halide anions compared to simple calixpyrrole apart from showing binding towards dihydrogenphosphate and acetate ions. The association constants are quite similar to that found for orcinol strapped calixpyrrole towards halide anions in general, but having a higher preference for chloride than bromide ion in particular. Further it shows very strong preference towards fluoride ion.
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