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Isolated “molecular wires” are produced in the channels of zeolites by polymerizing pyrrole with embedded FeIII or CuII ions, according to spectroscopic, stoichiometric, and kinetic investigations. The doped zeolites (zeolite Y and mordenite) display no “bulk” conductivity, but they should be useful for studying the properties of isolated polypyrrole chains.
Bein et al. (1989) studied this question.