Title

Direct Evidence of a Bipolaron Charge Carrier in Conducting Polyazines from 13C and 15N Solid-State NMR Spectroscopy: Detection of a Nitrenium Cation by Natural Abundance 15N Solid-State NMR Spectroscopy

Document Type

Article

Date of Original Version

8-1-1991

Abstract

Natural abundance 13C and l5N solid-state NMR experiments were performed on undoped and doped samples of polyazine, (−N=C(R)-C(R)=N−)x. The topology of the polymer requires that doping-induced charge carriers must be either polarons (radical cations) or bipolarons (dications). Magnetic susceptibility measurements shows that the iodine-doped polymers are diamagnetic, so the charge carriers must be bipolarons. The specific bipolaron charge carrier in polyazines has been identified; the nitrogens bear the charge primarily in the form of a nitrenium cation. This is the first report of a nitrenium cation detected by 15N solid-state NMR spectroscopy. Independent of the substitution of the polyazine, R = H or CH3, the same charge carrier is present. © 1991, American Chemical Society. All rights reserved.

Publication Title

Journal of the American Chemical Society

Volume

113

Issue

18

Share

COinS