title: Poly(p-phenylene ethynylene) Incorporating Sterically Enshrouding m-Terphenyl Oxacyclophane Canopies.
abstract: A sterically encumbered m-terphenyl oxacyclophane substituted with two aryl iodide substituents has been prepared as a versatile monomer for the preparation of π-conjugated polymers. The monomer has been used to prepare a poly(p-phenylene ethynylene) derivative (P1) incorporating oxacyclophane units as canopies that shield one side of the π-system from inter-chain interactions. The photophysical properties of P1 in dilute solution compare well to those of a poly(p-phenylene ethynylene) derivative (P2) that lacks the canopy. The presence of the steric canopy leads to a diminished inter-chain interaction in the solid state and enhances the kinetic response of P1 to vapors of nitro-organics such as TNT, presumably by increasing the permeability of P1 to these analytes over that of P2.
authors.affiliation: Department of Chemistry and Center for Optical Materials Science and Engineering Technologies (COMSET), Clemson University, Clemson, SC 29634, USA.
authors.forename: Brad P
authors.initials: BP
authors.lastname: Morgan
authors.forename: Robert J
authors.initials: RJ
authors.lastname: Gilliard
authors.forename: Rahul S
authors.initials: RS
authors.lastname: Loungani
authors.forename: Rhett C
authors.initials: RC
authors.lastname: Smith