Sauradip Chaudhuri - New strapped calix[4]pyrrole based receptor for anions

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  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

  DOI: 10.1016/j.ica.2011.02.004


    Calix[4]pyrrole 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 calix[4]pyrrole 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   calix[4]pyrrole also exhibits enhanced binding towards halide   anions compared to simple calix[4]pyrrole apart from showing   binding towards dihydrogenphosphate and acetate ions. The   association constants are quite similar to that found for orcinol   strapped calix[4]pyrrole 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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