Tetrabutylammonium hexafluorophosphate nbu4npf6

3,4-ethylenedioxythiophene (EDOT), poly(sodium 4-styrenesulfonate) (NaPSS, average M_w = 1,000,000 g/mol), and tetrabutylammonium hexafluorophosphate (nBu₄NPF₆) were obtained from Sigma Aldrich (Saint Louis, MO, USA). nBu₄NPF₆ was vacuum dried before use. Lithium perchlorate (LiClO₄) and potassium chloride (KCl) were obtained from Acros Organics. Deionized water (Millipore quality) and acetonitrile (ACN, HPLC grade, Sigma Aldrich) were used as solvents.

All manipulations were performed
in either an argon- or nitrogen-filled MBraun glovebox with an atmosphere
of <0.1 ppm of O₂ and <0.1 ppm of H₂O.
House nitrogen was purified through an MBraun HP-500-MO-OX gas purifier.
Tetrahydrofuran (THF) was predried by refluxing over potassium for
several days, distilled, and stirred over Na/K alloy for final purification.
Dimethoxyethane (DME) and toluene were dried over potassium, and ⁿhexane was dried over calcium hydride. All
solvents were distilled under N₂ from their drying agents,
and water/oxygen absence was confirmed via benzophenone solution as
an indicator within a glovebox prior to use. Deuterated solvents were
purchased from Cambridge Isotope Laboratories, dried over Na/K alloy
for several days, and filtered prior to use. Anhydrous ErCl₃ was purchased from Sigma-Aldrich and used as received. 2.2.2-Cryptand
(crypt-222) was purchased from Sigma-Aldrich and crystallized from
hot ⁿhexane prior to use. Tetrabutylammonium
hexafluorophosphate [ⁿBu₄N][PF₆] was purchased from Sigma-Aldrich and crystallized several
times before use. Dibenzocyclooctatetraene (dbCOT)^{40 (link)} and potassium graphite (KC₈)^{41 (link)} were prepared according to literature procedures. Elemental
analysis was performed at Michigan State University using a PerkinElmer
2400 Series II CHNS/O analyzer.