98%), N-methylPyrrole (MPy, ≥99%), methanol
(MeOH, 95%), sodium hydroxide (NaOH, ≥98%), aluminum oxide
(activated, basic, Brockmann I, standard grade, ∼150 mesh,
58 Å), sodium hydroxide (NaOH, ≥98%), hydrochloric acid
(HCl, 37 wt % aqueous solution), and poly(tetrafluoroethylene) powder
(PTFE, particle diameter: 200 μm) were purchased from Sigma-Aldrich
Co., LLC. N-EthylPyrrole (EPy, >98.0%) was purchased
from Tokyo Chemical Industry Co., Ltd. Each monomer was purified by
passing through a column containing the aluminum oxide before use.
Ferric chloride (FeCl3, 99%) was received from Nacalai
Tesque. Iron(III) chloride hexahydrate (FeCl3·6H2O, assay: min. 99.0%) and sulfuric acid (H2SO4, assay: min. 95.0%) were obtained from Wako Pure Chemistry,
Ltd. pH test paper (046.55) was obtained from As One Co., Ltd. Deionized
water (conductivity, less than 0.06 μS cm–1) was prepared using an MFS RFD240NA GA25A-0715 deionized water producing
apparatus (Advantec, Osaka, Japan).