A cyclodextrin–porphyrin assembly as chemosensor for pentachlorophenol

Abstract
A quantitative change in the absorption profile of the assembly prepared from the torus-shaped 2-hydroxypropyl-cycloheptaamylose (hp-β-cyclodextrin, hp-β-CD) and planar porphyrin 4,4′,4″,4‴-(21H,23H-porphine-5,10,15,20-tetrayl)tetrakis(benzoic acid)(POR) occurs highly selectively in response to a guest–host complexation of pentachlorophenol.